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Check-in [92353888aa]
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Overview
Comment:Updates to the change log for 3.12.0.
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SHA1: 92353888aa944b5ae771fd2f262d171d74c9119b
User & Date: drh 2016-03-09 15:56:58.733
Context
2016-03-09
16:03
Another bullet on the 3.12.0 change log. (check-in: 1b4e717575 user: drh tags: trunk)
15:56
Updates to the change log for 3.12.0. (check-in: 92353888aa user: drh tags: trunk)
2016-03-08
17:23
Correct and clarify the computation of local and overflow payload sizes in the file format documentation. (check-in: 9ec8b470d5 user: drh tags: trunk)
Changes
Unified Diff Ignore Whitespace Patch
Changes to pages/changes.in.
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  set aChng($nChng) [list $date $desc $options]
  incr nChng
}

chng {2016-04-00 (3.12.0)} {
<p><b><font color='red'>Potentially Disruptive Change:</font></b>
<li>The [SQLITE_DEFAULT_PAGE_SIZE] is increased from 1024 to 4096.  
    The [SQLITE_DEFAULT_CACHE_SIZE] from 2000 to -2000 so as to continue using

    the same amount of memory.  See the application note on the
    [version 3.12.0 page size change] for further information.
<p><b>Performance enhancements:</b>
<li>Enhancements to the [https://www.sqlite.org/src/doc/trunk/doc/lemon.html|Lemon]
    parser generator so that it creates a smaller and faster SQL parser.
<li>Only create [master journal] files if two or more attached databases are
(1) modified, (2) do not have [PRAGMA synchronous] set to OFF, and
(3) do not have the [journal_mode] set to OFF, MEMORY, or WAL.
<li>Only create [statement journal] file when their size exceeds a threashold
    (currently 64KiB).  Otherwise the journal is held in memory and no I/O occurs.









<p><b>New Features:</b>
<li>Added the [SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER] option to [sqlite3_db_config()]
    which allows the two-argument version of the [fts3_tokenizer()] SQL function to
    be enabled or disabled at run-time.
<li>The [PRAGMA defer_foreign_keys=ON] statement now also disables 
    [foreign key actions|RESTRICT actions] on foreign key.
<li>Added the [SQLITE_DEFAULT_SYNCHRONOUS] and [SQLITE_DEFAULT_WAL_SYNCHRONOUS]
    compile-time options.  The [SQLITE_DEFAULT_SYNCHRONOUS] compile-time option
    replaces the [SQLITE_EXTRA_DURABLE] option, which is no longer supported.
<p><b>Bug fixes:</b>
<li>Make sure the [sqlite3_set_auxdata()] values from multiple triggers
    within a single statement do not interfere with one another.
    Fix for ticket [https://www.sqlite.org/src/info/dc9b1c91|dc9b1c91].



}

chng {2016-03-03 (3.11.1)} {
<li>Improvements to the Makefiles and build scripts used by VisualStudio.
<li>Fix an [FTS5] issue in which the 'optimize' command could cause index corruption.
<li>Fix a buffer overread that might occur if [FTS5] is used to query a corrupt
    database file.








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  set aChng($nChng) [list $date $desc $options]
  incr nChng
}

chng {2016-04-00 (3.12.0)} {
<p><b><font color='red'>Potentially Disruptive Change:</font></b>
<li>The [SQLITE_DEFAULT_PAGE_SIZE] is increased from 1024 to 4096.  
    The [SQLITE_DEFAULT_CACHE_SIZE] is changed from 2000 to -2000 so 
    as to continue using the same amount of memory.
    See the application note on the
    [version 3.12.0 page size change] for further information.
<p><b>Performance enhancements:</b>
<li>Enhancements to the [https://www.sqlite.org/src/doc/trunk/doc/lemon.html|Lemon]
    parser generator so that it creates a smaller and faster SQL parser.
<li>Only create [master journal] files if two or more attached databases are
(1) modified, (2) do not have [PRAGMA synchronous] set to OFF, and
(3) do not have the [journal_mode] set to OFF, MEMORY, or WAL.
<li>Only create [statement journal] files when their size exceeds a threshold.
    Otherwise the journal is held in memory and no I/O occurs.  The threshold
    can be configured at compile-time using [SQLITE_STMTJRNL_SPILL] or at
    start-time using [sqlite3_config]([SQLITE_CONFIG_STMTJRNL_SPILL]).
<li>The query planner is able to optimize IN operators on [virtual tables]
    even if the [xBestIndex] method does not set the
    sqlite3_index_constraint_usage.omit flag of the
    virtual table column to the left of the IN operator.
<li>The query planner now does a better job of optimizing [virtual table]
    accesses in a 3-way or higher join where constraints on the virtual
    table are split across two or more other terms of the join.
<p><b>New Features:</b>
<li>Added the [SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER] option to [sqlite3_db_config()]
    which allows the two-argument version of the [fts3_tokenizer()] SQL function to
    be enabled or disabled at run-time.
<li>The [PRAGMA defer_foreign_keys=ON] statement now also disables 
    [foreign key actions|RESTRICT actions] on foreign key.
<li>Added the [SQLITE_DEFAULT_SYNCHRONOUS] and [SQLITE_DEFAULT_WAL_SYNCHRONOUS]
    compile-time options.  The [SQLITE_DEFAULT_SYNCHRONOUS] compile-time option
    replaces the [SQLITE_EXTRA_DURABLE] option, which is no longer supported.
<p><b>Bug fixes:</b>
<li>Make sure the [sqlite3_set_auxdata()] values from multiple triggers
    within a single statement do not interfere with one another.
    Fix for ticket [https://www.sqlite.org/src/info/dc9b1c91|dc9b1c91].
<li>Fix the code generator for expression of the form "x IN (SELECT...)" where
    the SELECT statement on the RHS is a correlated subquery.
    For for ticket [https://www.sqlite.org/src/info/5e3c886796e5512e|5e3c886796e5512e].
}

chng {2016-03-03 (3.11.1)} {
<li>Improvements to the Makefiles and build scripts used by VisualStudio.
<li>Fix an [FTS5] issue in which the 'optimize' command could cause index corruption.
<li>Fix a buffer overread that might occur if [FTS5] is used to query a corrupt
    database file.
︙︙