Documentation Source Text

      http://www.sqlite.org/src/timeline</a>.</p>
    }
    hd_close_aux
    hd_enable_main 1
  }
}

chng {2012 May 14 (3.7.12)} {
<li>Add the [SQLITE_DBSTATUS_CACHE_WRITE] option for [sqlite3_db_status()].
<li>Optimize the [typeof()] and [length()] SQL functions so that they avoid
    unnecessary reading of database content from disk.
<li>Add the [FTS4 "merge" command], the [FTS4 "automerge" command], and
    the [FTS4 "integrity-check" command].
<li>Report the name of specific [CHECK] constraints that fail.
<li>In the command-line shell, use popen() instead of fopen() if the first
    character of the argument to the ".output" command is "|".
<li>Make use of OVERLAPPED in the windows [VFS] to avoid some system calls
    and thereby obtain a performance improvement.
<li>More aggressive optimization of the AND operator when one side or the
    other is always false.
<li>Add the [SQLITE_RTREE_INT_ONLY] compile-time option to force the
    [rtree | R*Tree Extension Module] to use integer instead of
    floating point values for both storage and computation.
<li>Enhance the [PRAGMA integrity_check] command to use much less memory when
    processing multi-gigabyte databases.
<li>New interfaces added to the test_quota.c add-on module.
<li>Added the ".trace" dot-command to the command-line shell.
<li>Allow virtual table constructors to be invoked recursively.
<li>Improved optimization of ORDER BY clauses on compound queries.
<li>Improved optimization of aggregate subqueries contained within an
    aggregate query.
<li>Bug fix: Fix the [RELEASE] command so that it does not cancel pending
    queries.  This repairs a problem introduced in 3.7.11.
<li>Bug fix: Do not discard the DISTINCT as superfluous unless a subset of
    the result set is subject to a UNIQUE constraint <em>and</em> it none
    of the columns in that subset can be NULL.
    Ticket [http://www.sqlite.org/src/info/385a5b56b9 | 385a5b56b9].
<li>Bug fix: Do not optimize away an ORDER BY clause that has the same terms
    as a UNIQUE index unless those terms are also NOT NULL.
    Ticket [http://www.sqlite.org/src/info/2a5629202f | 2a5629202f].

}

chng {2012 March 20 (3.7.11)} {
<li>Enhance the [INSERT] syntax to allow multiple rows to be inserted
    via the VALUES clause.
<li>Enhance the [CREATE VIRTUAL TABLE] command to support the

<p>^There is a single row in the sqlite_sequence table for each ordinary
table that uses AUTOINCREMENT.  The name of the table (as it appears in
sqlite_master.name) is in the sqlite_sequence.main field and the largest
[INTEGER PRIMARY KEY] ever used by that table is in the sqlite_sequence.seq
field.  ^New automatically generated integer primary keys for AUTOINCREMENT
tables are guaranteed to be larger than the sqlite_sequence.seq field for
that table.
^(If the sqlite_sequence.seq field of an AUTOINCREMENT table is already at
the largest integer value (9223372036854775807) then attempts to add new
rows to that table with an automatically generated integer primary will fail
with an [SQLITE_FULL] error.)^
^The sqlite_sequence.seq field is automatically updated if required when
new entries are added to an AUTOINCREMENT table.  
^The sqlite_sequence row for an AUTOINCREMENT table is automatically deleted
when the table is dropped.
^If the sqlite_sequence row for an AUTOINCREMENT table does not exist when
the AUTOINCREMENT table is updated, then a new sqlite_sequence row is created.
^(If the sqlite_sequence.seq value for an AUTOINCREMENT table is manually 
set to something other than an integer and there is a subsequent attempt to
insert the or update the AUTOINCREMENT table, then the behavior is undefined.)^

<p>^Application code is allowed to modify the sqlite_sequence table, to add
new rows, to delete rows, or to modify existing rows.  ^However, application
code cannot create the sqlite_sequence table if it does not already exist.
^Application code can delete all entries from the sqlite_sequence table,
but application code cannot drop the sqlite_sequence table.

Section {ANALYZE} analyze ANALYZE

BubbleDiagram analyze-stmt 1
</tcl>

<p> ^The ANALYZE command gathers statistics about tables and
indices and stores the collected information
in [internal tables] of the database where the query optimizer can
access the information and use it to help make better query planning choices.
^If no arguments are given, all attached databases are
analyzed.  ^If a database name is given as the argument, then all tables
and indices in that one database are analyzed.  
^If the argument is a table name, then only that table and the
indices associated with that table are analyzed.  ^If the argument
is an index name, then only that one index is analyzed.</p>

  hd_puts "<h3>$date - $title</h3>"
  regsub -all "\n( *\n)+" $text "</p>\n\n<p>" txt
  regsub -all {[Tt]icket #(\d+)} $txt \
      {<a href="http://www.sqlite.org/cvstrac/tktview?tn=\1">\0</a>} txt
  hd_resolve "<blockquote>$txt</blockquote>"
  hd_puts "<hr width=\"50%\">"
}

newsitem {2012-May-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-March-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