<?xml version="1.0" encoding="Windows-1252"?>
<title>SQLite Older News</title>

<tcl>
proc newsitem {date title text} {
  regsub -all {[^a-z0-9]} $date _ tag
  hd_puts "<a name=\"$tag\"></a>"
  hd_puts "<h3>$date - $title</h3>"
  regsub -all "\n( *\n)+" $text "</p>\n\n<p>" txt
  hd_resolve "<blockquote>$txt</blockquote>"
  hd_puts "<hr width=\"50%\">"
}

newsitem {2012-12-19} {Release 3.7.15.1} {
  SQLite [version 3.7.15.1] is a patch release that fixes a single bug
  that was introduced in version [version 3.7.15].  The fix involved changing
  two lines of code and adding a single assert().  This release also includes
  some new test cases to prevent a regression of the bug, and the version
  number is increased, of course.  But otherwise, nothing has changed from
  [version 3.7.15].
}

newsitem {2012-12-12} {Release 3.7.15} {
  SQLite [version 3.7.15] is a regularly schedule release of SQLite.  This
  release contains several improvements to the query planner and optimizer
  and one important bug fix.  This is the first release to officially
  support Windows 8 Phone.

  The important bug fix is a problem that can lead to segfaults when using
  [shared cache mode] on a schema that contains a [COLLATE operator] within
  a [CHECK constraint] or within a [view].  Collating functions are associated
  with individual database connections.  But a pointer to the collating function
  was also being cached within expressions.  If an expression was part of the
  schema and contained a cached collating function, it would point to the
  collating function in the database connection that originally parsed the
  schema.  If that database connection closed while other database 
  connections using the same shared cache continued to operate, they other
  database connections would try to use the deallocated collating function
  in the database connection that closed.  The fix in version 3.7.15 was to
  not cache collating function pointers in the expression structure but 
  instead look them up each time a new statement is prepared.

  This release also contains some important enhancements to the query planner
  which should (we hope) make some queries run faster.  The enhancements
  include:

  <ol><li><p>When doing a full-table scan, try to use an index instead of
  the original table, under the theory that indices contain less information
  and are thus smaller and hence require less disk I/O to scan.</p>

  <li><p>Enhance the [IN operator] to allow it to make use of 
  indices that have [affinity | numeric affinity].</p>

  <li><p>Do a better job of recognizing when an ORDER BY clause can be 
  implemented using indices - especially in cases where the ORDER BY clause
  contains terms from two or more tables in a join.</p>
  </ol>
}

newsitem {2012-10-04} {Release 3.7.14.1} {
  SQLite [version 3.7.14.1] is a patch release.  Changes from the baseline
  version 3.7.14 are minimal and are restricted to fixing three bugs.

  One of the fixed bugs is a long-standing issue with the TCL interface.
  Another is an external compiler bug that SQLite merely works around and
  that only comes up if you are using the VisualStudio-2012 compiler to
  generate WinRT applications on ARM with optimizations enabled.  The
  third problem is an SQLite core bug, introduced in version 3.7.14, that
  can cause a segfault if a query contains a LEFT JOIN that contains an OR
  in the ON clause.
}


newsitem {2012-09-03} {Release 3.7.14} {
  SQLite [version 3.7.14] is a regularly scheduled maintenance release
  of SQLite.  The previous release continues to work well.  Upgrading
  is optional.

  Version 3.7.14 drops native support for OS/2.  We are not aware of any
  active projects that were using SQLite on OS/2 and since the SQLite
  developers had no way of testing on OS/2 it seemed like it was time
  to simply remove the OS/2 code from the SQLite tree.  If there are
  OS/2 projects out there that still need SQLite support, they can
  continue to maintain their own private [VFS] which can be linked to
  SQLite at start-time using the [sqlite3_vfs_register()] interface.

  The [sqlite3_close_v2()] interface has been added.  The sqlite3_close_v2()
  interface differs from sqlite3_close() in that it is designed to work
  better for host language that use a garbage collector.  With the older
  sqlite3_close() interface, the associated [prepared statements] and
  [sqlite3_backup] objects must be destroyed before the database connection.
  With the newer sqlite3_close_v2() interface, the objects can be destroyed
  in any order.

  This release also includes performance improvements to the sort algorithm
  that is used to implement ORDER BY and CREATE INDEX.  And the query planner
  has been enhanced to better use covering indices on queries that use OR
  terms in the WHERE clause.
}

newsitem {2012-06-11} {Release 3.7.13} {
  SQLite [version 3.7.13] adds support for WinRT and metro style
  applications for Microsoft Windows 8.  The 3.7.13 release is
  coming sooner than is usual after the previous release in order to get
  this new capability into the hands of developers.  To use SQLite in 
  a metro style application, compile with the -DSQLITE_OS_WINRT flag.
  Because of the increased application security and safety requirements
  of WinRT, all database
  filenames should be full pathnames.  Note that SQLite is not capable
  of accessing databases outside the installation directory and application
  data directory.  This restriction is another security and safety feature
  of WinRT. Apart from these restrictions, SQLite should work exactly
  the same on WinRT as it does on every other system.

  Also in this release: when a database is opened using [URI filenames]
  and the [coreqp | mode=memory] query parameter 
  then the database is an in-memory database, just as if it had
  been named ":memory:".  But, if shared cache mode is enabled, then
  all other database connections that specify the same URI filename
  will connect to the same in-memory database.  This allows two or more
  database connections (in the same process) to share the same in-memory
  database.

  This release also includes some corner-case performance optimizations
  that are obscure yet significant to an important subset of SQLite users.
  Getting these performance optimizations into circulation quickly is
  yet another reason for making this release so soon following the previous.

  The next release of SQLite is scheduled to occur after the usual
  2 or 3 month interval.
}

newsitem {2012-05-22} {Patch Release 3.7.12.1} {
  SQLite [version 3.7.12.1] is a patch release for [version 3.7.12] that
  fixes a [http://www.sqlite.org/src/info/c2ad16f997ee9c | bug] that was
  introduced in version 3.7.12 and that can
  cause a segfault for certain obscure nested aggregate queries.
  There are very few changes in 3.7.12.1, and upgrading is only needed for
  applications that do nested aggregate queries.
}

newsitem {2012-05-14} {Version 3.7.12} {
  SQLite [version 3.7.12] is a regularly scheduled maintenance release.
  This release contains several new optimizations and bug fixes and upgrading
  is recommended.  See the [version 3.7.12 | change summary] for details.
}

newsitem {2012-03-20} {Version 3.7.11} {
  SQLite [version 3.7.11] is a regularly scheduled maintenance release
  which was rushed out early due to a 
  [http://www.sqlite.org/src/info/b7c8682cc1 | bug in the query optimizer]
  introduced in the previous release.  The bug is obscure - it changes
  a LEFT JOIN into an INNER JOIN in some cases when there is a 3-way join
  and OR terms in the WHERE clause.  But it was considered serious enough to
  rush out a fix.  Apart from this one problem, SQLite [version 3.7.10] has
  not given any trouble.  Upgrading to [version 3.7.11] from versions
  3.7.6.3, 3.7.7, 3.7.7.1, 3.7.8, or 3.7.9 is
  optional.  Upgrading from other releases, including the previous release
  3.7.10, is recommended.

  Other enhancements found in this release are enumerated in the
  [version 3.7.11 | change log].
}

newsitem {2012-01-16} {Version 3.7.10} {
  SQLite [version 3.7.10] is a regularly scheduled maintenance release.
  Upgrading from version 3.7.6.3, 3.7.7, 3.7.7.1, 3.7.8, or 3.7.9 is
  optional.  Upgrading from other releases is recommended.

  The [SQLITE_CONFIG_PCACHE] mechanism has been replaced with
  [SQLITE_CONFIG_PCACHE2].  If you do not know what this mechanism
  is (it is an extreme corner-case and is seldom used) then this 
  change will not effect you in the least.

  The default [schema format number] for new database files has changed
  from 1 to 4.  SQLite has been able to generate and read database files
  using schema format 4 for six years.  But up unto now, the default
  schema format has been 1 so that older versions of SQLite could read
  and write databases generated by newer versions of SQLite.  But those
  older versions of SQLite have become so scarce now that it seems 
  reasonable to make the new format the default.

  SQLite is changing some of the assumptions it makes above the behavior
  of disk drives and flash memory devices during a sudden power loss.
  This change is completely transparent to applications.
  Read about the [powersafe overwrite] property for additional information.

  Lots of new interfaces have been added in this release:
  <ul>
  <li> [sqlite3_db_release_memory()]
  <li> [PRAGMA shrink_memory]
  <li> [sqlite3_db_filename()]
  <li> [sqlite3_stmt_busy()]
  <li> [sqlite3_uri_boolean()]
  <li> [sqlite3_uri_int64()]
  </ul>

  The [PRAGMA cache_size] statement has been enhanced.  Formerly, you would
  use this statement to tell SQLite how many pages of the database files it
  should hold in its cache at once.  The total memory requirement would
  depend on the database page size. Now, if you give [PRAGMA cache_size]
  a negative value -N, it will allocate roughly N 
  [http://en.wikipedia.org/wiki/Kibibyte | kibibytes] of memory to cache,
  divided up according to page size.  This enhancement allows programs to
  more easily control their memory usage.

  There have been several obscure bug fixes.  One noteworthy bug,
  ticket [http://www.sqlite.org/src/info/ff5be73dee | ff5be73dee],
  could in theory result in a corrupt database file if a power loss
  occurred at just the wrong moment on an unusually cantankerous disk
  drive.  But that is mostly a theoretical concern and is very unlikely
  to happen in practice.  The bug was found during laboratory testing
  and has never been observed to occur in the wild.
}

newsitem {2011-11-01} {Version 3.7.9} {
  SQLite [version 3.7.9] is a regularly scheduled maintenance release.
  Upgrading from version 3.7.6.3, 3.7.7, 3.7.7.1, and 3.7.8 is optional.
  Upgrading from other versions is recommended.

  The [SQLITE_ENABLE_STAT2] compile-time option is now a no-op.  The enhanced
  query-planner functionality formerly available using SQLITE_ENABLE_STAT2
  is now available through [SQLITE_ENABLE_STAT3].  The enhanced query planning
  is still disabled by default.  However, future releases of SQLite might
  convert STAT3 from an enable-option to a disable-option so that it is 
  available by default and is only omitted upon request.

  The [FTS4] full-text search engine has been enhanced such that tokens in
  the search string that begin with "&#94" must be the first token in their
  respective columns in order to match.   Formerly, "&#94;" characters in the
  search string were simply ignored.  Hence, if a legacy application was
  including "&#94;" characters in FTS4 search strings, thinking that they would
  always be ignored, then those legacy applications might break with this
  update.  The fix is simply remove the "&#94;" characters from the search 
  string.

  See the [version 3.7.9 | change summary] for additional changes associated
  with this release.  
}

newsitem {2011-September-19} {Version 3.7.8} {
  SQLite [version 3.7.8] is a quarterly maintenance release.  Upgrading from
  versions 3.7.6.3, 3.7.7, or 3.7.7.1 is optional.  Upgrading from other
  versions is recommended.

  This release features a new "external merge sort" algorithm used to
  implement ORDER BY and GROUP BY and also to presort the content of an
  index for CREATE INDEX.  The new algorithm does approximately the same
  number of comparisons and I/Os as before, but the I/Os are much more
  sequential and so runtimes are greatly reduced when the size of the
  set being sorted is larger than the filesystem cache.  The performance 
  improvement can be dramatic - orders of magnitude faster 
  for large CREATE INDEX commands.  On the other hand, 
  the code is slightly slower (1% or 2%)
  for a small CREATE INDEX.  Since CREATE INDEX is not an
  operation that commonly occurs on a speed-critical path, we feel that 
  this tradeoff is a good one.  The slight slowdown for small CREATE INDEX
  statements might be recovered in a future release.  ORDER BY and GROUP BY
  operations should now be faster for all cases, large and small.

  The query planner has been enhanced to do a better job of handling
  the DISTINCT keyword on SELECT statements.

  There has been a lot of work on the default [VFSes].  The unix VFS has
  been enhanced to include more overrideable system calls - a feature requested
  by Chromium to make it easier to build SQLite into a sandbox.  The
  windows VFS has been enhanced to be more resistant to interference from
  anti-virus software.

  Every version of SQLite is better tested than the previous, and 3.7.8
  is no exception to this rule.  Version 3.7.8 has been used internally by
  the SQLite team for mission critical functions and has performed flawlessly.
  And, of course, it passes our rigorous [testing] procedures with no
  problems detected.  Version 3.7.8 is recommended for all new development.
}

newsitem {2011-06-28} {Version 3.7.7.1} {
  SQLite [version 3.7.7.1] adds a one-line bug fix to 3.7.7 to fix
  [http://www.sqlite.org/src/info/25ee812710 | a problem]
  causing [PRAGMA case_sensitive_like] statements compiled using the legacy
  [sqlite3_prepare()] interface to fail with an [SQLITE_SCHEMA] error. Because
  [sqlite3_exec()] uses sqlite3_prepare() internally, the problem also affects
  sqlite3_exec().

  Upgrading from 3.7.7 is only required for applications that use "PRAGMA
  case_sensitive_like" and the sqlite3_prepare() (or sqlite3_exec()) interface.
}

newsitem {2011-06-24} {Version 3.7.7} {
  SQLite [version 3.7.7] is a regularly scheduled bi-monthly maintenance
  release.  Upgrading from version 3.7.6.3 is optional.  Upgrading from all
  prior releases is recommended.

  This release adds support for naming database files using [URI filenames].
  URI filenames are disabled by default (for backwards compatibility) but
  applications are encouraged to enable them since incompatibilities are
  likely to be exceedingly rare and the feature is useful.  See the 
  [URI filenames | URI filename documentation] for details.

  Most of the other enhancements in this release involve 
  [virtual tables].  The virtual table interface has been enhanced to
  support [SAVEPOINT] and [ON CONFLICT] clause processing, and the built-in 
  [RTREE] and [FTS3 | FTS3/FTS4] have been augmented to take advantage of 
  the new capability.  This means, for example, that it is now possible
  to use the [REPLACE] command on [FTS3 | FTS3/FTS4] and [RTREE] tables.

  The [FTS4] full-text index extension has been enhanced to support
  the [FTS4 prefix option] and the [FTS4 order option].  These two enhancements
  are provided in support of search-as-you-type interfaces where search
  results begin to appear after the first keystroke in the "search" box
  and are refined with each subsequent keystroke.  The way this is done is
  to do a separate full-text search after each key stroke, and add the
  "*" wildcard at the end of the word currently being typed.  So, for
  example, if the text typed so far is "fast da" and the next character
  typed is "t", then the application does a full-text search of the
  pattern "fast dat*" and displays the results.  Such capability has
  always existed.  What is new is that the [FTS4 prefix option] allows
  the search to be very fast (a matter of milliseconds) even for difficult
  cases such as "t*" or "th*".

  There has been a fair amount of work done on the FTS4 module for this
  release.  But the core SQLite code has changed little and the previous
  release has not given any problems, so we expect this to be a very
  stable release.
}

newsitem {2011-05-19} {Version 3.7.6.3} {
  SQLite [version 3.7.6.3] is a patch release that fixes a 
  [http://www.sqlite.org/src/info/2d1a5c67df | single bug]
  associated with [WAL mode].  The bug has been in SQLite ever since WAL
  was added, but the problem is very obscure and so nobody has noticed
  before now.  Nevertheless, all users are encouraged to upgrade to
  version 3.7.6.3 or later.

  The bug is this:
  If the [cache_size] is set very small (less than 10) and SQLite comes
  under memory pressure and if a multi-statement transaction is started
  in which the last statement prior to COMMIT is a SELECT statement and if
  a [checkpoint] occurs right after the transaction commit, then
  it might happen that the transaction will be silently rolled back instead
  of being committed.

  The default setting for [cache_size] is 2000. So in most situations, this
  bug will never appear.  But sometimes programmers set [cache_size] to
  very small values on gadgets and other low-memory devices in order to
  save memory space.  Such applications are vulnerable.
  Note that this bug does <u>not</u> cause database corruption.  It is
  as if [ROLLBACK] were being run instead of [COMMIT] in some cases.

  <b>Bug Details</b>

  Transactions commit in WAL mode by adding a record onto the end of
  the WAL (the write-ahead log) that contains a "commit" flag.  So to
  commit a transaction, SQLite takes all the pages that have changed
  during that transaction, appends them to the WAL, and sets the commit
  flag on the last page.  Now, if SQLite comes under memory pressure, it
  might try to free up memory space by writing changed pages to the WAL
  prior to the commit.  We call this "spilling" the cache to WAL.  There 
  is nothing wrong with spilling cache to WAL.  But if the
  memory pressure is severe, it might be that by the time [COMMIT] is run,
  all changed pages for the transaction have already been spilled to WAL
  and there are no pages left to be written to WAL.
  And with no unwritten pages, there was nothing to put the commit flag
  on.  And without a commit flag, the transaction would end up being
  rolled back.

  The fix to this problem was that if all changed pages has already
  been written to the WAL when the commit was started, then page 1 of
  the database will be written to the WAL again, so that there will always
  be a page available on which to set the commit flag.
}

newsitem {2011-04-17} {Version 3.7.6.2} {
  SQLite [version 3.7.6.2] adds a one-line bug fix to 3.7.6.1 that enables
  pthreads to work correctly on NetBSD.  The problem was a faulty function
  signature for the open system call.  The problem does not appear to have
  any adverse impact on any system other than NetBSD.

  Upgrading from version 3.7.6.1 is only needed on NetBSD.
}

newsitem {2011-04-13} {Version 3.7.6.1} {
  SQLite [version 3.7.6.1] fixes a single bug in 3.7.6 that can cause a
  segfault if [SQLITE_FCNTL_SIZE_HINT] is used on a unix build that has
  SQLITE_ENABLE_LOCKING_MODE set to 0 and is compiled with
  HAVE_POSIX_FALLOCATE.

  Upgrading from 3.7.6 is only needed for users effected by the 
  configuration-specific bug described above.  There are no other changes
  to the code.
}

newsitem {2011-04-12} {Version 3.7.6} {
  SQLite [version 3.7.6] is a regularly scheduled bi-monthly maintenance
  release of SQLite.  Upgrading from version 3.7.5 is optional.  Upgrading
  releases prior to 3.7.5 is recommended.
}

newsitem {2011-02-01} {Version 3.7.5} {
  SQLite [version 3.7.5] is a regularly scheduled bi-monthly maintenance
  release of SQLite.  Due to the discovery and fix of 
  [http://www.sqlite.org/src/tktview?name=5d863f876e | an obscure bug]
  that could cause database corruption, upgrading from all prior
  releases of SQLite is recommended.  This bug was found during code
  review and has not been observed in the wild.

  This release adds new [SQLITE_DBSTATUS_LOOKASIDE_HIT | opcodes] for the
  [sqlite3_db_status()] interface that allow more precise measurement of
  how the [lookaside memory allocator] is performing, which can be useful
  for tuning in applications with very tight memory constraints.

  The [sqlite3_vsnprintf()] interface was added.  This routine is simply
  a varargs version of the long-standing [sqlite3_snprintf()] interface.

  The output from [sqlite3_trace()] interface has been enhanced to work
  better (and faster) in systems that use recursive extensions such as
  [FTS3] or [RTREE].

  Testing with Valgrind shows that this release of SQLite is about 1%
  or 2% faster than the previous release for most operations.

  A fork of the popular ADO.NET adaptor for SQLite known as System.Data.SQLite
  is now available on [http://System.Data.SQLite.org/].  The originator
  of System.Data.SQLite, Robert Simpson, is aware of this fork, has
  expressed his approval, and has commit privileges on the new Fossil
  repository.  The SQLite development team intends to maintain
  System.Data.SQLite moving forward.
}

newsitem {2010-12-08} {Version 3.7.4} {
  SQLite [version 3.7.4] is a regularly scheduled bi-monthly maintenance
  release of SQLite.  Upgrading from [version 3.7.2] and [version 3.7.3]
  is optional.  Upgrading from all other SQLite releases is recommended.

  This release features [full-text search] enhancements.  The older 
  [FTS3] virtual table is still fully supported, and should also run
  faster.  In addition, the new [FTS4] virtual table is added.  FTS4
  follows the same syntax as FTS3 but holds additional metadata which
  facilitates some performance improvements and more advanced 
  [matchinfo()] output.  Look for further full-text search enhancements
  in subsequent releases.

  Also in this release, the [EXPLAIN QUERY PLAN] output has been enhanced
  and new documentation is provided so that application developers can
  more easily understand how SQLite is performing their queries.

  Thanks to an account from the folks at [http://www.devio.us/], OpenBSD
  has been added to the list of platforms upon which we 
  [tested | test SQLite] prior to every release.  That list of platforms
  now includes:

  <ul>
  <li> Linux x86 &amp; x86_64
  <li> MacOS 10.5 &amp; 10.6
  <li> MacOS 10.2 PowerPC
  <li> WinXP and Win7
  <li> Android 2.2
  <li> OpenBSD 4.7
  </ul>

  The previous release of SQLite ([version 3.7.3]) has proven to be very
  robust.  The only serious issue discovered was
  [http://www.sqlite.org/src/info/80ba201079 | ticket 80ba201079] that
  describes an incorrect query result that can occur under very 
  unusual circumstances.  The ticket description contains details of the
  problem.  Suffice it to say here that the problem is very obscure and
  is unlikely to effect most applications and so upgrading is optional.
  The problem is fixed, of course, in this release.
}

newsitem {2010-October-08}  {Version 3.7.3} {
  SQLite [version 3.7.3] is a regularly scheduled bi-monthly maintenance
  release of SQLite.  Upgrading from [version 3.7.2] is optional.
  Upgrading from all other releases is recommended.

  This release adds two new interfaces (really just variations on existing
  interfaces).  The [sqlite3_create_function_v2()] interface adds a 
  destructor for the application-data pointer.  The new 
  [sqlite3_soft_heap_limit64()] interface allows the soft heap limit to
  be set to a value greater than 2<sup>31</sup>. 

  The [RTREE] extension has been enhanced with the ability to have an
  [custom r-tree queries | application-defined query region].  This might
  be used, for example, to locate all objects within 
  the field of view of a camera.

  The 3.7.3 release also includes some performance enhancements, including
  query planner improvements, documentation updates,
  and fixes to some very obscure bugs.
}

newsitem {2010-August-24} {Version 3.7.2} {
  SQLite [version 3.7.2] fixes a long-standing bug that can cause the
  database [free-page list] to go corrupt if [incremental_vacuum] is used
  multiple times to
  partially reduce the size of a database file that contains many hundreds
  of unused database pages.  The original bug reports together with links
  to the patch that fixes it can be seen 
  <a href="http://www.sqlite.org/src/info/5e10420e8d">here</a>.

  This bug has been in the code for at least a year and possibly longer.
  The bug has nothing to do with the versions 3.7.1 or 3.7.0 or any other
  recent release.  The fact that the bug was discovered (and fixed)
  within hours of the 3.7.1 release is purely a coincidence.

  The bug is impossible to hit without using [incremental_vacuum] and is
  very difficult to hit even with incremental_vacuum.  And the kind of
  corruption that the bug causes can usually be fixed 
  simply by running [VACUUM].  Nevertheless, because the bug can result
  in database corruption, it is recommended that all SQLite users upgrade
  to version 3.7.2 or later.
}

newsitem {2010-August-23} {Version 3.7.1} {
  SQLite [version 3.7.1] is a stabilization release for the 3.7.x series.
  Other than the filesize-in-header bug that was fixed in [version 3.7.0.1],
  no major problems have been seen in 3.7.0.  Some minor corner-case
  performance regressions have been fixed.  A typo in the OS/2 interface
  has been repaired.

  A biggest part of the 3.7.1 release is a cleanup and refactoring of
  the pager module within SQLite.  This refactoring should have no
  application-visible effects.  The purpose was to reorganize the code
  in ways that make it easier to prove correctness.

  The 3.7.1 release adds new experimental methods for obtained more 
  detailed memory usage information and for controlling database file
  fragmentation.  And the query planner now does a better job of
  optimizing the [LIKE] and [GLOB] operators.

  This release increases the maximum size of database pages from 32KiB to
  64KiB.  A database with 64KiB pages will not be readable or writable by
  older versions of SQLite.  Note that further increases in page size
  are not feasible since the [file format] uses 16-bit offsets to structures
  within each page.
}

newsitem {2010-August-04} {Version 3.7.0.1} {
  SQLite [version 3.7.0.1] is a patch release to fix a bug in the new
  filesize-in-header feature of the [file format | SQLite file format]
  that could cause database corruption if the same database file is
  written alternately with version 3.7.0 and version 3.6.23.1 or earlier.
  A performance regression was also fixed in this release.
}

newsitem {2010-07-22} {Version 3.7.0} {
  SQLite [version 3.7.0] is a major release of SQLite that features
  a new transaction control mechanism using a [write-ahead log] or [WAL].
  The traditional rollback-journal is still used as the default so there
  should be no visible change for legacy programs.  But newer programs
  can take advantage of improved performance and concurrency by enabling
  the WAL journaling mode.

  SQLite version 3.7.0 also contains some query planner enhancements and
  a few obscure bug fixes, but the only really big change is the addition
  of WAL mode.
}

newsitem {2010-03-30} {Version 3.6.23.1} {
  SQLite [version 3.6.23.1] is a patch release to fix a bug in the
  offsets() function of [FTS3] at the request of the Mozilla.  
}

newsitem {2010-03-09} {Version 3.6.23} {
  SQLite [version 3.6.23] is a regular bimonthly release of SQLite.
  Upgrading from the prior release is purely optional.

  This release contains new pragmas: the [secure_delete pragma], and
  the [compile_options pragma].
  There are a new SQL functions: [sqlite_compileoption_used()]
  and [sqlite_compileoption_get()].
  New C/C++ interfaces: [sqlite3_compileoption_used()],
  [sqlite3_compileoption_get()], [SQLITE_CONFIG_LOG], and
  [sqlite3_log()].

  This release also includes several minor bug fixes and performance
  improvements.  Support for [SQLITE_OMIT_FLOATING_POINT] is enhanced.
  There are on-going improvements to [FTS3].

  The ".genfkey" command in the [Command Line Interface] has been
  removed.  SQLite has supported standard SQL [foreign key constraints]
  since [version 3.6.19] and so the ".genfkey" command was seen as
  an anachronism.
}

newsitem {2010-01-06} {Version 3.6.22} {
  SQLite [version 3.6.22] is a bug-fix release.  Two bugs have been fixed
  that might cause incorrect query results.  
  <ul>
  <li>Ticket [http://www.sqlite.org/src/info/31338dca7e | 31338dca7e]
  describes a
  problem with queries that have a WHERE clause of the form (x AND y) OR z
  where x and z come from one table of a join and y comes from a different
  table.
  <li> Ticket [http://www.sqlite.org/src/info/eb5548a849 | eb5548a849]
  describes
  a problem where the use of the CAST operator in the WHERE clause can lead
  to incorrect results if the column being cast to a new datatype is also
  used in the same WHERE clause without being cast.
  </ul>
  Both bugs are obscure,
  but because they could arise in an application after deployment, it is
  recommended that all applications upgrade SQLite to version 3.6.22.

  This release also includes other minor bug fixes and performance
  enhancements, especially in the [FTS3] extension.
}


newsitem {2009-12-07} {Version 3.6.21} {
  SQLite [version 3.6.21] focuses on performance optimization.  For
  a certain set of traces, this version uses 12% fewer CPU instructions
  than the previous release (as measured by Valgrind).  In addition, the
  [FTS3] extension has been through an extensive cleanup and rework and
  the [sqlite3_trace()] interface has been modified to insert 
  [bound parameter] values into its output.
}

newsitem {2009-11-04} {Version 3.6.20} {
  SQLite [version 3.6.20] is a general maintenance release.  The
  query planner has been enhanced to work better with bound parameters
  in LIKE and GLOB operators and in range constraints and various minor
  bugs have been fixed.  Upgrading from 3.6.19 is optional.
}

newsitem {2009-10-14} {Version 3.6.19} {
  SQLite [version 3.6.19] adds native support for
  [foreign key constraints], including deferred constraints and
  cascading deletes.  Enforcement of foreign keys is disabled by
  default for backwards compatibility and must be turned on using
  the [foreign_keys pragma].

  Version 3.6.19 also adds support for the
  [IS operator | IS and IS NOT operators].  Formerly, SQLite (as most
  other SQL database engines) supported IS NULL and IS NOT NULL.  The
  IS and IS NOT operators are generalizations that allow the right-hand
  side to be an arbitrary expression.  IS and IS NOT work the same as
  == (equals) and != (not equals) except that with IS and IS NOT the
  NULL values compare equal to one another.
}

newsitem {2009-09-11} {Version 3.6.18} {
  Beginning with this release, the SQLite source code is tracked and
  managed using the [http://www.fossil-scm.org/ | Fossil]
  distributed configuration management system.  SQLite was previously
  versioned using CVS.  The entire CVS history has been imported into
  Fossil.  The older CVS repository remains on the website but is
  read-only.

  There are two major enhancements in SQLite version 3.6.18.  The first
  is a series or refinements to the query planner that help SQLite to
  choose better plans for joins where in the past it was selecting suboptimal
  query plans.  The [SQLITE_ENABLE_STAT2] compile-time option has been
  added to cause SQLite to collect histogram data on indices when the
  [ANALYZE] command is run.  The use of histograms improve the query
  planning performance even more.

  The second major enhancement is that SQLite now support recursive
  triggers.  The older non-recursive behavior of triggers is still the
  default behavior.  Recursive triggers are activated using the
  [recursive_triggers pragma].  In addition to allowing triggers to
  call themselves (either directly or indirectly) the new capability
  also fires DELETE triggers on rows that are removed from a table
  as a result of [ON CONFLICT | REPLACE] conflict resolution processing.

  Non-recursive triggers are still the default behavior since this
  is least likely to cause problems for existing applications.  However,
  we anticipate that triggers will become
  recursive by default beginning with release 3.7.0.  At that point,
  applications that want to continue using the older non-recursive
  trigger behavior will need to use the [recursive_triggers pragma]
  to disable recursive triggers.

  This version of SQLite also contains bug fixes, though none of the
  bugs are serious and all are obscure, so upgrading is optional.

  The SQLite core continues to have [test coverage | 100% branch test coverage]
  and so despite the many changes in this release, the developers 
  believe that this version of SQLite is stable and ready for production
  use.
}

newsitem {2009-08-10} {Version 3.6.17} {
  This is a monthly maintenance release with a focus of bug fixes,
  performance improvements, and increased test coverage.  This is the
  first release of SQLite since [test coverage | 100% branch test coverage]
  was achieved on the SQLite core.  

  In addition, a new interface [sqlite3_strnicmp()] is provided for the
  convenience of extension writers.

  None of the bugs fixed in this release are serious.  All bugs are
  obscure.  Upgrading is optional.
}

newsitem {2009-07-25} {100% Branch Test Coverage} {
  A subset of the [TH3] test suite was measured by gcov to provide
  [test coverage | 100% branch test coverage] over the SQLite core
  (exclusive of the VFS backend and of extensions such as FTS3 and RTREE)
  when compiled for SuSE 10.1 Linux on x86.  The SQLite developers pledge
  to maintain branch test coverage at 100% in all future releases.
  Ongoing work will strive for 100% branch test coverage on the 
  operating-system backends and extensions as well.
}

newsitem {2009-06-27} {Version 3.6.16} {
  SQLite [version 3.6.16] is another general maintenance release containing
  performance and robustness enhancements.  A single notable bug was fixed
  (ticket #3929).  This bug cause cause INSERT or UPDATE statements to fail
  on indexed tables that have AFTER triggers that modify the same table and
  index.
}

newsitem {2009-06-15} {Version 3.6.15} {
  SQLite [version 3.6.15] is a general maintenance release containing
  performance and robustness enhancements and fixes for various obscure
  bugs.  
}

newsitem {2009-05-25} {Version 3.6.14.2} {
  SQLite [version 3.6.14.2] fixes an obscure bug in the code generator
  (<a href="http://www.sqlite.org/cvstrac/tktview?tn=3879">ticket #3879</a>)
  section of SQLite which can potentially cause incorrect query results.
  The changes from the prior release consist of only this one bug fix,
  check-in <a href="http://www.sqlite.org/cvstrac/chngview?cn=6676">[6676]</a>
  and a change to the version number text.

  The bug was introduced in version 3.6.14.  It is recommended that
  users of version 3.6.14 and 3.6.14.1 upgrade to this release.  Applications
  are unlikely to hit this bug, but since it is difficult to predict which
  applications might hit it and which might not, we recommend that all
  users of 3.6.14 and 3.5.14.1 upgrade to this release.
}

newsitem {2009-05-19} {Version 3.6.14.1} {
  SQLite [version 3.6.14.1] is a patch release to [version 3.6.14] with
  minimal changes that fixes three bugs.  Upgrading is only necessary 
  for users who are impacted by one or more of those bugs.
}

newsitem {2009-05-07} {Version 3.6.14} {
  SQLite [version 3.6.14] provides new performance enhancements in
  the btree and pager layers and in the query optimizer.  Certain
  workloads can be as much as twice as fast as the previous release,
  though 10% faster is a more typical result.

  Queries against [virtual tables] that contain OR and IN operators
  in the WHERE clause are now able to use indexing.

  A new optional [asynchronous I/O backend] is available for
  unix and windows.  The asynchronous backend gives the illusion of faster
  response time by pushing slow write operations into a background thread.
  The tradeoff for faster response time is that more memory is required
  (to hold the content of the pending writes) and if a power failure or
  program crash occurs, some transactions that appeared to have committed
  might end up being rolled back upon restart.

  This release also contains many minor bug fixes, documentation enhancements,
  new test cases, and cleanups and simplifications to the source code.

  There is no compelling reason to upgrade from versions 3.6.12 or
  3.6.13 if those prior versions are working.  Though many users may
  benefit from the improved performance.
}

newsitem {2008-12-16} {Version 3.6.7} {
  SQLite [version 3.6.7] contains a major cleanup of the Unix driver,
  and support for the new Proxy Locking mechanism on Mac OS X.  Though
  the Unix driver is reorganized, its functionality is the same and so
  applications should not notice a difference.
}

newsitem {2008-11-26} {Version 3.6.6.2} {
  This release fixes a bug that was introduced into SQLite [version 3.6.6]
  and which seems like it might be able to cause database corruption.  This
  bug was detected during stress testing.  It has not been seen in the wild.
  An analysis of the problem suggests that the bug might be able to cause
  database corruption, however focused efforts to find a real-world test
  cases that actually causes database corruption have so far been unsuccessful.
  Hence, the likelihood of this bug causing problems is low.  Nevertheless,
  we have decided to do an emergency branch release out of an abundance of
  caution.

  The [version 3.6.6.2] release also fixes an obscure memory leak that
  can occur following a disk I/O error.
}

newsitem {2008-11-22} {Version 3.6.6.1} {
  This release fixes a bug that was introduced into SQLite [version 3.6.4]
  and that can cause database corruption in obscure cases.  This bug has
  never been seen in the wild; it was first detected by internal stress
  tests and required substantial analysis before it could be shown to 
  potentially lead to corruption.  So we feel that SQLite versions 3.6.4,
  3.6.5, and 3.6.6 are safe to use for development work.  But upgrading
  to this patch release or later is recommended prior to deploying
  products that incorporate SQLite.

  We have taken the unusual step of issuing a patch release in order to
  get the fix for this bug into circulation quickly.  SQLite version 3.6.7
  will continue on its normal path of development with an anticipated
  release in mid December.  
}
  

newsitem {2008-11-19} {Version 3.6.6} {
  SQLite [version 3.6.5] is released.  This is a quick turn-around release
  that fixes a bug in virtual tables and FTS3 that snuck into
  [version 3.6.5].  This release also adds the new
  application-defined page cache mechanism.
}

newsitem {2008-11-12} {Version 3.6.5} {
  SQLite [version 3.6.5] is released.  There are various minor feature
  enhancements and numerous obscure bug fixes. 
  The [version 3.6.5|change log] contains the details.  Upgrading is
  optional.
}

newsitem {2008-11-01} {Bloomberg Joins SQLite Consortium} {
  The SQLite developers are honored to announce that
  [http://www.bloomberg.com/ | Bloomberg] has joined the
  [SQLite Consortium].
}

newsitem {2008-10-15} {Version 3.6.4} {
  SQLite version 3.6.4 adds new features designed to help applications
  detect when indices are not being used on query.  There are also some
  important performance improvements.  Upgrading is optional.
}

newsitem {2008-09-22} {Version 3.6.3} {
  SQLite version 3.6.3 fixes a bug in SELECT DISTINCT that was introduced
  by the previous version.  No new features are added.  Upgrading is
  recommended for all applications that make use of DISTINCT.
}

newsitem {2008-08-30} {Version 3.6.2} {
  SQLite version 3.6.2 contains rewrites of the page-cache subsystem and
  the procedures for matching identifiers to table columns in SQL statements.
  These changes are designed to better modularize the code and make it more
  maintainable and reliable moving forward.  Nearly 5000 non-comment lines 
  of core code (about 11.3%) have changed
  from the previous release.  Nevertheless, there should be no
  application-visible changes, other than bug fixes.
}

newsitem {2008-08-06} {Version 3.6.1} {
  SQLite version 3.6.1 is a stabilization and performance enhancement
  release.  
}

newsitem {2008-07-16} {Version 3.6.0 beta} {
  Version 3.6.0 makes changes to the [sqlite3_vfs | VFS] object in order
  to make SQLite more easily portable to a wider variety of platforms.
  There are potential incompatibilities with some legacy applications.
  See the [35to36 | 35to36.html] document for details.

  Many new interfaces are introduced in version 3.6.0.  The code is
  very well tested and is appropriate for use in stable systems.  We
  have attached the "beta" designation only so that we can make tweaks to
  the new interfaces in the next release without having to declare an
  incompatibility.
}

newsitem {2008-05-12} {Version 3.5.9} {
  Version 3.5.9 adds a new experimental [PRAGMA]: [journal_mode].
  Setting the journal mode to PERSIST can provide performance improvement
  on systems where deleting a file is expensive.  The PERSIST journal
  mode is still considered experimental and should be used with caution
  pending further testing.

  Version 3.5.9 is intended to be the last stable release prior to
  version 3.6.0.  Version 3.6.0 will make incompatible changes to the
  [sqlite3_vfs] VFS layer in order to address deficiencies in the original
  design.  These incompatibilities will only effect programmers who
  write their own custom VFS layers (typically embedded device builders).
  The planned VFS changes will be much smaller
  than the changes that occurred on the 
  [34to35 | 3.4.2 to 3.5.0 transaction] that occurred last
  September.

  This release of SQLite is considered stable and ready for production use.
}

newsitem {2008-04-16} {Version 3.5.8} {
  Version 3.5.8 includes some important new performance optimizations
  in the virtual machine code generator, including constant subexpression
  factoring and common subexpression elimination.  This release also
  creates new public interfaces:
  [sqlite3_randomness()] provides access to SQLite's internal
  pseudo-random number generator, [sqlite3_limit()] allows size
  limits to be set at run-time on a per-connection basis, and
  [sqlite3_context_db_handle()] is a convenience routine that allows
  an application-defined SQL function implementation to retrieve
  its [database connection] handle.

  This release of SQLite is considered stable and ready for production use.
}

newsitem {2008-03-17} {Version 3.5.7} {
  Version 3.5.7 fixes several minor and obscure bugs, especially 
  in the autoconf-generated makefile.  Upgrading is optional.
  This release of SQLite is considered stable and ready for production use.
}

newsitem {2008-02-06} {Version 3.5.6} {
  Version 3.5.6 fixes a minor regression in 3.5.5 - a regression that
  had nothing to do with the massive change of the virtual machine
  to a register-based design.
  No problems have been reported with the new virtual machine.  This
  release of SQLite is considered stable and ready for production use.
}

newsitem {2008-01-31} {Version 3.5.5} {
  Version 3.5.5 changes over 8% of the core source code of SQLite in order
  to convert the internal virtual machine from a stack-based design into
  a register-based design.  This change will allow future optimizations
  and will avoid an entire class of stack overflow bugs that have caused
  problems in the past.  Even though this change is large, extensive testing
  has found zero errors in the new virtual machine and so we believe this
  to be a very stable release.
}

newsitem {2007-12-14} {Version 3.5.4} {
  Version 3.5.4 fixes a long-standing but obscure bug in UPDATE and
  DELETE which might cause database corruption.  (See ticket #2832.)
  Upgrading is recommended for all users.

  This release also brings the processing of ORDER BY statements into
  compliance with standard SQL.  This could, in theory, cause problems
  for existing applications that depend on the older, buggy behavior.
  See ticket #2822 for additional information.
}

newsitem {2007-12-12} {SQLite Consortium Announced} {
  The <a href="consortium.html">SQLite Consortium</a> was launched
  today with [http://www.mozilla.org/ | Mozilla] and
  [http://www.symbian.com/ | Symbian] as charter members.
  As noted in the <a href="pressrelease-20071212.html">press release</a>,
  the Consortium's goal is to promote the continuing vitality and
  independence of SQLite.  
}
newsitem {2007-11-27} {Version 3.5.3} {
  This is an incremental release that fixes several minor problems.
  Upgrading is optional.  If Version 3.5.2 or 3.5.1 is working fine
  for you, then there is no pressing need to change to 3.5.3.

  The prebuilt binaries and the amalgamation found on the 
  <a href="download.html">download</a> page include the FTS3 fulltext
  search extension module.  We are doing this on an experimental
  basis and are not promising to provide prebuilt binaries with
  FTS3 in the future.
}

newsitem {2007-11-05} {Version 3.5.2} {
  This is an incremental release that fixes several minor problems,
  adds some obscure features, and provides some performance tweaks.  
  Upgrading is optional.

  The experimental compile-time option
  [omitfeatures | SQLITE_OMIT_MEMORY_ALLOCATION] is no longer supported.  On the other
  hand, it is now possible to compile SQLite so that it uses a static
  array for all its dynamic memory allocation needs and never calls
  malloc.  Expect to see additional radical changes to the memory 
  allocation subsystem in future releases.
}

newsitem {2007-10-04} {Version 3.5.1} {
  Fix a long-standing bug that might cause database corruption if a
  disk-full error occurs in the middle of a transaction and that
  transaction is not rolled back.
  <a href="http://www.sqlite.org/cvstrac/tktview?tn=2686">Ticket #2686.</a>

  The new VFS layer is stable.  However, we still reserve the right to
  make tweaks to the interface definition of the VFS if necessary.
}

newsitem {2007-09-04} {Version 3.5.0 alpha} {
  The OS interface layer and the memory allocation subsystems in
  SQLite have been reimplemented.  The published API is largely unchanged
  but the (unpublished) OS interface has been modified extensively.  
  Applications that implement their own OS interface will require
  modification.  See
  <a href="34to35.html">34to35.html</a> for details.<p>

  This is a large change.  Approximately 10% of the source code was
  modified.  We are calling this first release "alpha" in order to give
  the user community time to test and evaluate the changes before we
  freeze the new design.
}

newsitem {2007-08-13} {Version 3.4.2} {
  While stress-testing the 
  <a href="c3ref/soft_heap_limit.html">soft_heap_limit</a>
  feature, a bug that could lead to
  <a href="http://www.sqlite.org/cvstrac/wiki?p=DatabaseCorruption">database
  corruption</a> was <a href="http://www.sqlite.org/cvstrac/tktview?tn=2565">
  discovered and fixed</a>.
  Though the consequences of this bug are severe, the chances of hitting 
  it in a typical application are remote.  Upgrading is recommended
  only if you use the 
  <a href="c3ref/soft_heap_limit.html">sqlite3_soft_heap_limit</a>
  interface.
}

newsitem {2007-07-20} {Version 3.4.1} {
  This release fixes a bug in <a href="lang_vacuum.html">VACUUM</a> that
  can lead to <a href="http://www.sqlite.org/cvstrac/wiki?p=DatabaseCorruption">
  database corruption</a>.  The bug was introduced in version 
  <a href="changes.html#version_3_3_14">3.3.14</a>.
  Upgrading is recommended for all users.  Also included are a slew of
  other more routine
  <a href="changes.html#version_3_4_1">enhancements and bug fixes</a>.
}

newsitem {2007-06-18} {Version 3.4.0} {
  This release fixes two separate bugs either of which 
  can lead to database corruption.  Upgrading
  is strongly recommended.  If you must continue using an older version
  of SQLite, please at least read about how to avoid these bugs
  at
  <a href="http://www.sqlite.org/cvstrac/wiki?p=CorruptionFollowingBusyError">
  CorruptionFollowingBusyError</a> and
  <a href="http://www.sqlite.org/cvstrac/tktview?tn=2418">ticket #2418</a>
  <p>
  This release also adds explicit <a href="limits.html">limits</a> on the
  sizes and quantities of things SQLite will handle.  The new limits might
  causes compatibility problems for existing applications that
  use excessively large strings, BLOBs, tables, or SQL statements. 
  The new limits can be increased at compile-time to work around any problems
  that arise.  Nevertheless, the version number of this release is
  3.4.0 instead of 3.3.18 in order to call attention to the possible
  incompatibility.
  </p>
  There are also new features, including
  <a href="c3ref/blob_open.html">incremental BLOB I/O</a> and
  <a href="pragma.html#pragma_incremental_vacuum">incremental vacuum</a>.
  See the <a href="changes.html#version_3_4_0">change log</a> 
  for additional information.
}

newsitem {2007-04-25} {Version 3.3.17} {
  This version fixes a bug in the forwards-compatibility logic of SQLite
  that was causing a database to become unreadable when it should have
  been read-only.  Upgrade from 3.3.16 only if you plan to deploy into
  a product that might need to be upgraded in the future.  For day to day
  use, it probably does not matter.
}

newsitem {2007-04-18} {Version 3.3.16} {
  Performance improvements added in 3.3.14 but mistakenly turned off
  in 3.3.15 have been reinstated.  A bug has been fixed that prevented 
  VACUUM from running if a NULL value was in a UNIQUE column.
}

newsitem {2007-04-09} {Version 3.3.15} {
  An annoying bug introduced in 3.3.14 has been fixed.  There are
  also many enhancements to the test suite.  
}

newsitem {2007-04-02} {Version 3.3.14} {
  This version focuses on performance improvements.  If you recompile
  <a href="http://www.sqlite.org/cvstrac/wiki?p=TheAmalgamation">
  the amalgamation</a> using GCC option -O3 (the precompiled binaries
  use -O2) you may see performance
  improvements of 35% or more over version 3.3.13 depending on your
  workload.  This version also
  adds support for <a href="pragma.html#pragma_locking_mode">
  exclusive access mode</a>.
}

newsitem {2007-02-13} {Version 3.3.13} {
  This version fixes a subtle bug in the ORDER BY optimizer that can 
  occur when using joins.  There are also a few minor enhancements.
  Upgrading is recommended.
}

newsitem {2007-01-27} {Version 3.3.12} {
  The first published build of the previous version used the wrong
  set of source files.  Consequently, many people downloaded a build
  that was labeled as "3.3.11" but was really 3.3.10.  Version 3.3.12
  is released to clear up the ambiguity.  A couple more bugs have
  also been fixed and <a href="pragma.html#pragma_integrity_check">
  PRAGMA integrity_check</a> has been enhanced.
}

newsitem {2007-01-22} {Version 3.3.11} {
  Version 3.3.11 fixes for a few more problems in version 3.3.9 that
  version 3.3.10 failed to catch.  Upgrading is recommended.
}

newsitem {2007-01-09} {Version 3.3.10} {
  Version 3.3.10 fixes several bugs that were introduced by the previous
  release.  Upgrading is recommended.
}

newsitem {2007-01-04} {Version 3.3.9} {
  Version 3.3.9 fixes bugs that can lead to database corruption under
  obscure and difficult to reproduce circumstances.  See
  <a href="http://www.sqlite.org/cvstrac/wiki?p=DatabaseCorruption">
  DatabaseCorruption</a> in the
  <a href="http://www.sqlite.org/cvstrac/wiki">wiki</a> for details.
  This release also adds the new
  <a href="c3ref/prepare.html">sqlite3_prepare_v2()</a>
  API and includes important bug fixes in the command-line
  shell and enhancements to the query optimizer.  Upgrading is
  recommended.
}

newsitem {2006-10-09} {Version 3.3.8} {
  Version 3.3.8 adds support for full-text search using the 
  <a href="http://www.sqlite.org/cvstrac/wiki?p=FtsOne">FTS1
  module.</a>  There are also minor bug fixes.  Upgrade only if
  you want to try out the new full-text search capabilities or if
  you are having problems with 3.3.7.
}

newsitem {2006-08-12} {Version 3.3.7} {
  Version 3.3.7 includes support for loadable extensions and virtual
  tables.  But both features are still considered "beta" and their
  APIs are subject to change in a future release.  This release is
  mostly to make available the minor bug fixes that have accumulated
  since 3.3.6.  Upgrading is not necessary.  Do so only if you encounter
  one of the obscure bugs that have been fixed or if you want to try
  out the new features.
}

newsitem {2006-06-19} {New Book About SQLite} {
  <i>[http://www.apress.com/book/bookDisplay.html?bID=10130 | The Definitive Guide to SQLite]</i>,
  a new book by
  [http://www.mikesclutter.com | Mike Owens]
  is now available from [http://www.apress.com | Apress].
  The books covers the latest SQLite internals as well as
  the native C interface and bindings for PHP, Python,
  Perl, Ruby, Tcl, and Java.  Recommended.
}


newsitem {2006-06-6} {Version 3.3.6} {
  Changes include improved tolerance for Windows virus scanners
  and faster :memory: databases.  There are also fixes for several
  obscure bugs.  Upgrade if you are having problems.
}

newsitem {2006-04-5} {Version 3.3.5} {
  This release fixes many minor bugs and documentation typos and
  provides some minor new features and performance enhancements.
  Upgrade only if you are having problems or need one of the new features.
}

newsitem {2006-02-11} {Version 3.3.4} {
  This release fixes several bugs, including a 
  blunder that might cause a deadlock on multithreaded systems.
  Anyone using SQLite in a multithreaded environment should probably upgrade.
}

newsitem {2006-01-31} {Version 3.3.3 stable} {
  There have been no major problems discovered in version 3.3.2, so
  we hereby declare the new APIs and language features to be stable
  and supported.
}

newsitem {2006-01-24} {Version 3.3.2 beta} {
  More bug fixes and performance improvements as we move closer to
  a production-ready version 3.3.x.
}

newsitem {2006-01-16} {Version 3.3.1 alpha} {
  Many bugs found in last week's alpha release have now been fixed and
  the library is running much faster again.

  Database connections can now be moved between threads as long as the
  connection holds no locks at the time it is moved.  Thus the common
  paradigm of maintaining a pool of database connections and handing
  them off to transient worker threads is now supported.
  Please help test this new feature.
  See <a href="http://www.sqlite.org/cvstrac/wiki?p=MultiThreading">
  the MultiThreading wiki page</a> for additional
  information.
}

newsitem {2006-01-10} {Version 3.3.0 alpha} {
  Version 3.3.0 adds support for CHECK constraints, DESC indices,
  separate REAL and INTEGER column affinities, a new OS interface layer
  design, and many other changes.  The code passed a regression
  test but should still be considered alpha.  Please report any
  problems.

  The file format for version 3.3.0 has changed slightly to support
  descending indices and
  a more efficient encoding of boolean values.  SQLite 3.3.0 will read and
  write legacy databases created with any prior version of SQLite 3.  But
  databases created by version 3.3.0 will not be readable or writable
  by earlier versions of the SQLite.  The older file format can be
  specified at compile-time for those rare cases where it is needed.
}

newsitem {2005-12-19} {Versions 3.2.8 and 2.8.17} {
  These versions contain one-line changes to 3.2.7 and 2.8.16 to fix a bug
  that has been present since March of 2002 and version 2.4.0.
  That bug might possibly cause database corruption if a large INSERT or
  UPDATE statement within a multi-statement transaction fails due to a
  uniqueness constraint but the containing transaction commits.
}


newsitem {2005-09-24} {Version 3.2.7} {
  This version fixes several minor and obscure bugs.
  Upgrade only if you are having problems.
}

newsitem {2005-09-16} {Version 3.2.6 - Critical Bug Fix} {
  This version fixes a bug that can result in database
  corruption if a VACUUM of a 1 gigabyte or larger database fails
  (perhaps do to running out of disk space or an unexpected power loss)
  and is later rolled back.
  <p>
  Also in this release:
  The ORDER BY and GROUP BY processing was rewritten to use less memory.
  Support for COUNT(DISTINCT) was added.  The LIKE operator can now be
  used by the optimizer on columns with COLLATE NOCASE.
}

newsitem {2005-08-27} {Version 3.2.5} {
  This release fixes a few more lingering bugs in the new code.
  We expect that this release will be stable and ready for production use.
}

newsitem {2005-08-24} {Version 3.2.4} {
  This release fixes a bug in the new optimizer that can lead to segfaults
  when parsing very complex WHERE clauses.
}

newsitem {2005-08-21} {Version 3.2.3} {
  This release adds the <a href="lang_analyze.html">ANALYZE</a> command,
  the <a href="lang_expr.html">CAST</a> operator, and many
  very substantial improvements to the query optimizer.  See the
  <a href="changes.html#version_3_2_3">change log</a> for additional
  information.
}

newsitem {2005-08-02} {2005 Open Source Award for SQLite} {
  SQLite and its primary author D. Richard Hipp have been honored with
  a [http://osdir.com/Article6677.phtml | 2005 Open Source Award]
  from Google and O'Reilly.<br clear="right">
}


newsitem {2005-06-13} {Version 3.2.2} {
  This release includes numerous minor bug fixes, speed improvements,
  and code size reductions.  There is no reason to upgrade unless you
  are having problems or unless you just want to.
}

newsitem {2005-03-29} {Version 3.2.1} {
  This release fixes a memory allocation problem in the new
  <a href="lang_altertable.html">ALTER TABLE ADD COLUMN</a>
  command.
}

newsitem {2005-03-21} {Version 3.2.0} {
  The primary purpose for version 3.2.0 is to add support for
  <a href="lang_altertable.html">ALTER TABLE ADD COLUMN</a>.
  The new ADD COLUMN capability is made
  possible by AOL developers supporting and embracing great
  open-source software.  Thanks, AOL!

  Version 3.2.0 also fixes an obscure but serious bug that was discovered
  just prior to release.  If you have a multi-statement transaction and
  within that transaction an UPDATE or INSERT statement fails due to a
  constraint, then you try to rollback the whole transaction, the rollback
  might not work correctly.  See
  <a href="http://www.sqlite.org/cvstrac/tktview?tn=1171">Ticket #1171</a>
  for details.  Upgrading is recommended for all users.
}

newsitem {2005-03-16} {Version 3.1.6} {
  Version 3.1.6 fixes a critical bug that can cause database corruption
  when inserting rows into tables with around 125 columns. This bug was
  introduced in version 3.0.0.  See
  <a href="http://www.sqlite.org/cvstrac/tktview?tn=1163">Ticket #1163</a>
  for additional information.
}

newsitem {2005-03-11} {Versions 3.1.4 and 3.1.5 Released} {
  Version 3.1.4 fixes a critical bug that could cause database corruption
  if the autovacuum mode of version 3.1.0 is turned on (it is off by
  default) and a CREATE UNIQUE INDEX is executed within a transaction but
  fails because the indexed columns are not unique.  Anyone using the
  autovacuum feature and unique indices should upgrade.

  Version 3.1.5 adds the ability to disable
  the F_FULLFSYNC ioctl() in OS-X by setting "PRAGMA synchronous=on" instead
  of the default "PRAGMA synchronous=full".  There was an attempt to add
  this capability in 3.1.4 but it did not work due to a spelling error.
}

newsitem {2005-02-19} {Version 3.1.3 Released} {
  Version 3.1.3 cleans up some minor issues discovered in version 3.1.2.
}
  
newsitem {2005-02-15} {Versions 2.8.16 and 3.1.2 Released} {
  A critical bug in the VACUUM command that can lead to database
  corruption has been fixed in both the 2.x branch and the main
  3.x line.  This bug has existed in all prior versions of SQLite.
  Even though it is unlikely you will ever encounter this bug,
  it is suggested that all users upgrade.  See
  <a href="http://www.sqlite.org/cvstrac/tktview?tn=1116">
  ticket #1116</a>. for additional information.

  Version 3.1.2 is also the first stable release of the 3.1
  series.  SQLite 3.1 features added support for correlated
  subqueries, autovacuum, autoincrement, ALTER TABLE, and
  other enhancements.  See the 
  <a href="http://www.sqlite.org/releasenotes310.html">release notes
  for version 3.1.0</a> for a detailed description of the
  changes available in the 3.1 series.
}

newsitem {2005-02-01} {Version 3.1.1 (beta) Released} {
  Version 3.1.1 (beta) is now available on the
  website.  Version 3.1.1 is fully backwards compatible with the 3.0 series
  and features many new features including Autovacuum and correlated
  subqueries.  The
  <a href="http://www.sqlite.org/releasenotes310.html">release notes</a>
  From version 3.1.0 apply equally to this release beta.  A stable release
  is expected within a couple of weeks.
}

newsitem {2005-01-21} {Version 3.1.0 (alpha) Released} {
  Version 3.1.0 (alpha) is now available on the
  website.  Version 3.1.0 is fully backwards compatible with the 3.0 series
  and features many new features including Autovacuum and correlated
  subqueries.  See the
  <a href="http://www.sqlite.org/releasenotes310.html">release notes</a>
  for details.

  This is an alpha release.  A beta release is expected in about a week
  with the first stable release to follow after two more weeks.
}

newsitem {2004-11-09} {SQLite at the 2004 International PHP Conference} {
  There was a talk on the architecture of SQLite and how to optimize
  SQLite queries at the 2004 International PHP Conference in Frankfurt,
  Germany.
  <a href="http://www.sqlite.org/php2004/page-001.html">
  Slides</a> from that talk are available.
}

newsitem {2004-10-11} {Version 3.0.8} {
  Version 3.0.8 of SQLite contains several code optimizations and minor
  bug fixes and adds support for DEFERRED, IMMEDIATE, and EXCLUSIVE
  transactions.  This is an incremental release.  There is no reason
  to upgrade from version 3.0.7 if that version is working for you.
}


newsitem {2004-10-10} {SQLite at the 11<sup><small>th</small></sup>
Annual Tcl/Tk Conference} {
  There will be a talk on the use of SQLite in Tcl/Tk at the
  11<sup><small>th</small></sup> Tcl/Tk Conference this week in
  New Orleans.  Visit [http://www.tcl.tk/community/tcl2004/]
  for details.
  <a href="http://www.sqlite.org/tclconf2004/page-001.html">
  Slides</a> from the talk are available.
}

newsitem {2004-09-18} {Version 3.0.7} {
  Version 3.0 has now been in use by multiple projects for several
  months with no major difficulties.   We consider it stable and
  ready for production use. 
}

newsitem {2004-09-02} {Version 3.0.6 (beta)} {
  Because of some important changes to sqlite3_step(),
  we have decided to
  do an additional beta release prior to the first "stable" release.
  If no serious problems are discovered in this version, we will
  release version 3.0 "stable" in about a week.
}


newsitem {2004-08-29} {Version 3.0.5 (beta)} {
  The fourth beta release of SQLite version 3.0 is now available.
  The next release is expected to be called "stable".
}


newsitem {2004-08-08} {Version 3.0.4 (beta)} {
  The third beta release of SQLite version 3.0 is now available.
  This new beta fixes several bugs including a database corruption
  problem that can occur when doing a DELETE while a SELECT is pending.
  Expect at least one more beta before version 3.0 goes final.
}

newsitem {2004-07-22} {Version 3.0.3 (beta)} {
  The second beta release of SQLite version 3.0 is now available.
  This new beta fixes many bugs and adds support for databases with
  varying page sizes.  The next 3.0 release will probably be called
  a final or stable release.

  Version 3.0 adds support for internationalization and a new
  more compact file format. 
  <a href="version3.html">Details.</a>
  The API and file format have been fixed since 3.0.2.  All
  regression tests pass (over 100000 tests) and the test suite
  exercises over 95% of the code.

  SQLite version 3.0 is made possible in part by AOL
  developers supporting and embracing great Open-Source Software.
}

newsitem {2004-07-22} {Version 2.8.15} {
  SQLite version 2.8.15 is a maintenance release for the version 2.8
  series.  Version 2.8 continues to be maintained with bug fixes, but
  no new features will be added to version 2.8.  All the changes in
  this release are minor.  If you are not having problems, there is
  there is no reason to upgrade.
}

newsitem {2004-06-30} {Version 3.0.2 (beta) Released} {
  The first beta release of SQLite version 3.0 is now available.
  Version 3.0 adds support for internationalization and a new
  more compact file format. 
  <a href="version3.html">Details.</a>
  As of this release, the API and file format are frozen.  All
  regression tests pass (over 100000 tests) and the test suite
  exercises over 95% of the code.

  SQLite version 3.0 is made possible in part by AOL
  developers supporting and embracing great Open-Source Software.
}
  

newsitem {2004-06-25} {Website hacked} {
  The www.sqlite.org website was hacked sometime around 2004-06-22
  because the lead SQLite developer failed to properly patch CVS.
  Evidence suggests that the attacker was unable to elevate privileges
  above user "cvs".  Nevertheless, as a precaution the entire website
  has been reconstructed from scratch on a fresh machine.  All services
  should be back to normal as of 2004-06-28.
}


newsitem {2004-06-18} {Version 3.0.0 (alpha) Released} {
  The first alpha release of SQLite version 3.0 is available for
  public review and comment.  Version 3.0 enhances internationalization support
  through the use of UTF-16 and user-defined text collating sequences.
  BLOBs can now be stored directly, without encoding.
  A new file format results in databases that are 25% smaller (depending
  on content).  The code is also a little faster.  In spite of the many
  new features, the library footprint is still less than 240KB
  (x86, gcc -O1).
  <a href="version3.html">Additional information</a>.

  Our intent is to freeze the file format and API on 2004-07-01.
  Users are encouraged to review and evaluate this alpha release carefully 
  and submit any feedback prior to that date.

  The 2.8 series of SQLite will continue to be supported with bug
  fixes for the foreseeable future.
}

newsitem {2004-06-09} {Version 2.8.14 Released} {
  SQLite version 2.8.14 is a patch release to the stable 2.8 series.
  There is no reason to upgrade if 2.8.13 is working ok for you.
  This is only a bug-fix release.  Most development effort is
  going into version 3.0.0 which is due out soon.
}

newsitem {2004-05-31} {CVS Access Temporarily Disabled} {
  Anonymous access to the CVS repository will be suspended
  for 2 weeks beginning on 2004-06-04.  Everyone will still
  be able to download
  prepackaged source bundles, create or modify trouble tickets, or view
  change logs during the CVS service interruption. Full open access to the
  CVS repository will be restored on 2004-06-18.
}

newsitem {2004-04-23} {Work Begins On SQLite Version 3} {
  Work has begun on version 3 of SQLite.  Version 3 is a major
  changes to both the C-language API and the underlying file format
  that will enable SQLite to better support internationalization.
  The first beta is schedule for release on 2004-07-01.

  Plans are to continue to support SQLite version 2.8 with
  bug fixes.  But all new development will occur in version 3.0.
}
</tcl>
