Documentation Source Text

       {line ALTER TABLE {optx /database-name .} /table-name}
       {tailbranch
          {line RENAME TO /new-table-name}
          {line ADD {optx COLUMN} column-def}
       }
  }
  analyze-stmt {
     line ANALYZE {or nil /database-name /table-or-index-name
                    {line /database-name . /table-or-index-name}}
  }
  attach-stmt {
     line ATTACH {or DATABASE nil} expr AS /database-name
  }
  begin-stmt {
     line BEGIN {or nil DEFERRED IMMEDIATE EXCLUSIVE}
          {optx TRANSACTION}

<li> Integer arithmetic operations what would have resulted in overflow
     are now performed using floating-point instead.
<li> Increased the version number on the [sqlite3_vfs | VFS object] to
     3 and added new methods xSetSysCall, xGetSysCall, and xNextSysCall
     used for doing full-coverage testing.
<li> Increase the maximum value of [SQLITE_MAX_ATTACHED] from 30 to 62
     (though the default value remains at 10).
<li> Enhancements to FTS4:
     <ol type="a">
     <li> Added the [fts4aux] table
     <li> Added support for [compressed FTS4 content]
     </ol>
<li> Enhance the [ANALYZE] command to support the name of an index
     as its argument, in order to analyze just that one index.
<li> Added the "unix-excl" built-in VFS on unix and unix-like platforms.
}

chng {2011 February 01 (3.7.5)} {
<li> Added the [sqlite3_vsnprintf()] interface.
<li> Added the [SQLITE_DBSTATUS_LOOKASIDE_HIT],
     [SQLITE_DBSTATUS_LOOKASIDE_MISS_SIZE], and
     [SQLITE_DBSTATUS_LOOKASIDE_MISS_FULL] options for the

Product {sqlite-amalgamation-DATE.zip} {
  This is a snapshot (as of VERSION) of the current SQLite code under 
  development.  Use this snapshot for testing only.  This is not a release.
  This ZIP archive contains all preprocessed C code combined into a
  single source file (the <a href="amalgamation.html">amalgamation</a>).
}
Product {sqlite-amalgamation32k-DATE.zip} {
  This is a snapshot (as of VERSION) of the current SQLite code under 
  development.  The code is split into a small number of source files,
  such that no source files is longer than 32767 lines of code.
  Use this snapshot for testing only.  This is not a release.
}
Product {sqlite-tea-DATE.zip} {
  This is a snapshot (as of VERSION) of the current SQLite code under 
  development, packaged and ready to build using the
  <a href="http://www.tcl.tk/doc/tea/">Tcl Extension Architecture (TEA)</a>.
  Use this snapshot for testing only.  This is not a release.
}
Product {sqlite-shell-win32-x86-DATE.zip} {

Heading {Source Code}

Product {sqlite-amalgamation-VVV.zip} {
  This ZIP archive contains all C source code for SQLite VERSION
  combined into a
  single source file (the <a href="amalgamation.html">amalgamation</a>).
}

Product {sqlite-amalgamation32k-VVV.zip} {
  This ZIP archive contains all C source code for SQLite VERSION
  combined into a small number of source files, where no source file
  is longer than 32767 lines of code.
}

Product {sqlite-autoconf-VVV.tar.gz} {
  A tarball containing the <a href="amalgamation.html">amalgamation</a>
  for SQLite VERSION together with an configure script and makefile
  for building it.
} {amalgtarball {amalgamation tarball}}

    
  <tr><td>uncompress<td>
    This option is used to specify the uncompress function. It is an error to
    specify an uncompress function without also specifying a compress
    function.
</table>

<tcl>hd_fragment *fts4compression {compressed FTS4 content}</tcl>
<p>
  The compress and uncompress options allow FTS4 content to be stored in
  the database in a compressed form. Both options should be set to the name
  of an SQL scalar function registered using [sqlite3_create_function()]
  that accepts a single argument. 

<p>

<tcl>
##############################################################################
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 a special tables in the database where the query optimizer can use
them 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>

<p> ^The default implementation stores all statistics in a single
table named <b>sqlite_stat1</b>.  ^If SQLite is compiled with the
[SQLITE_ENABLE_STAT2] option, then additional histogram data is
collected and stored in <b>sqlite_stat2</b>.
Future enhancements may create
additional tables with the same name pattern except with the "1"
or "2" changed to a different digit.</p>

<p> ^The [DROP TABLE] and [ALTER TABLE] commands do
not work on the <b>sqlite_stat1</b> or <b>sqlite_stat2</b> tables,
but all the content of those tables can be queried using [SELECT]
and can be deleted, augmented, or modified using the [DELETE],
[INSERT], and [UPDATE] commands.
Appropriate care should be used when changing the content of the statistics
tables as invalid content can cause SQLite to select inefficient
query plans.  Generally speaking, one should not modify the content of
the statistics tables by any mechanism other than invoking the
ANALYZE command.</p>

<p> ^Statistics gathered by ANALYZE are <u>not</u> automatically updated as
the content of the database changes.  If the content of the database
changes significantly, or if the database schema changes, then one should
consider rerunning the ANALYZE command in order to update the statistics.</p>

<p> The query planner might not notice manual changes to the
<b>sqlite_stat1</b> and/or <b>sqlite3_stat2</b> tables.  ^An application
can force the query planner to reread the statistics tables by running
<b>ANALYZE sqlite_master</b>. </p>

<tcl>
##############################################################################
Section {ATTACH DATABASE} attach *ATTACH

BubbleDiagram attach-stmt 1
</tcl>