Documentation Source Text

set nChng 0
proc chng {date desc {options {}}} {
  global nChng aChng
  set aChng($nChng) [list $date $desc $options]
  incr nChng
}

chng {2016-03-29 (3.12.0)} {
<p><b>Potentially Disruptive Change:</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 
    the same amount of cache memory is used by default.
    See the application note on the
    [version 3.12.0 page size change] for further information.
<p><b>Performance enhancements:</b>

    accesses in a 3-way or higher join where constraints on the virtual
    table are split across two or more other tables of the join.
<li>More efficient handling of [application-defined SQL functions], especially
    in cases where the application defines hundreds or thousands of 
    custom functions.
<li>The query planner considers the LIMIT clause when estimating the cost
    of ORDER BY.
<li>The configure script (on unix) automatically detects
    pread() and pwrite() and sets compile-time options to use those OS
    interfaces if they are available.
<li>Reduce the amount of memory needed to hold the schema.
<li>Other miscellaneous micro-optimizations for improved performance and reduced
    memory usage.
<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>Added the [https://www.sqlite.org/src/artifact/d7cc99350?ln=403-443|sqlite3rbu_bp_progress()]
    interface to the [RBU] extension.

  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 {2016-03-29} {Release 3.12.0} {
<p>SQLite [version 3.12.0] is a regularly scheduled maintenance release.
   A notable change in this release is an
   [increase in the default page size] for newly created database files.
   There are also various performance improvements.
   See the [version 3.12.0|change log] for details.
}

newsitem {2016-03-03} {Release 3.11.1} {
<p>SQLite [version 3.11.1] is a patch release that fixes problems in the
   new [FTS5] extension and increases a default setting in the [spellfix1]
   extension, and implements enhancements to some of the Windows makefiles.
   The SQLite core is unchanged from 3.11.0. Upgrading is optional.
}

<title>Change in Default Page Size in SQLite Version 3.12.0</title>
<tcl>hd_keywords {version 3.12.0 page size change} \
     {increase in the default page size}</tcl>

<h1 align="center">The Default Page Size Change of SQLite 3.12.0</h1>

<h2>1.0 Introduction</h2>

<p>
An SQLite database file consists of one or more "pages".