<!DOCTYPE html> <html><head> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <link href="../sqlite.css" rel="stylesheet"> <title>SQLite Release 3.8.8.2 On 2015-01-30</title> <!-- path=../ --> </head> <body> <div class=nosearch> <a href="../index.html"> <img class="logo" src="../images/sqlite370_banner.gif" alt="SQLite" border="0"> </a> <div><!-- IE hack to prevent disappearing logo --></div> <div class="tagline desktoponly"> Small. Fast. Reliable.<br>Choose any three. </div> <div class="menu mainmenu"> <ul> <li><a href="../index.html">Home</a> <li class='mobileonly'><a href="javascript:void(0)" onclick='toggle_div("submenu")'>Menu</a> <li class='wideonly'><a href='../about.html'>About</a> <li class='desktoponly'><a href="../docs.html">Documentation</a> <li class='desktoponly'><a href="../download.html">Download</a> <li class='wideonly'><a href='../copyright.html'>License</a> <li class='desktoponly'><a href="../support.html">Support</a> <li class='desktoponly'><a href="../prosupport.html">Purchase</a> <li class='search' id='search_menubutton'> <a href="javascript:void(0)" onclick='toggle_search()'>Search</a> </ul> </div> <div class="menu submenu" id="submenu"> <ul> <li><a href='../about.html'>About</a> <li><a href='../docs.html'>Documentation</a> <li><a href='../download.html'>Download</a> <li><a href='../support.html'>Support</a> <li><a href='../prosupport.html'>Purchase</a> </ul> </div> <div class="searchmenu" id="searchmenu"> <form method="GET" action="../search"> <select name="s" id="searchtype"> <option value="d">Search Documentation</option> <option value="c">Search Changelog</option> </select> <input type="text" name="q" id="searchbox" value=""> <input type="submit" value="Go"> </form> </div> </div> <script> function toggle_div(nm) { var w = document.getElementById(nm); if( w.style.display=="block" ){ w.style.display = "none"; }else{ w.style.display = "block"; } } function toggle_search() { var w = document.getElementById("searchmenu"); if( w.style.display=="block" ){ w.style.display = "none"; } else { w.style.display = "block"; setTimeout(function(){ document.getElementById("searchbox").focus() }, 30); } } function div_off(nm){document.getElementById(nm).style.display="none";} window.onbeforeunload = function(e){div_off("submenu");} /* Disable the Search feature if we are not operating from CGI, since */ /* Search is accomplished using CGI and will not work without it. */ if( !location.origin || !location.origin.match || !location.origin.match(/http/) ){ document.getElementById("search_menubutton").style.display = "none"; } /* Used by the Hide/Show button beside syntax diagrams, to toggle the */ function hideorshow(btn,obj){ var x = document.getElementById(obj); var b = document.getElementById(btn); if( x.style.display!='none' ){ x.style.display = 'none'; b.innerHTML='show'; }else{ x.style.display = ''; b.innerHTML='hide'; } return false; } var antiRobot = 0; function antiRobotGo(){ if( antiRobot!=3 ) return; antiRobot = 7; var j = document.getElementById("mtimelink"); if(j && j.hasAttribute("data-href")) j.href=j.getAttribute("data-href"); } function antiRobotDefense(){ document.body.onmousedown=function(){ antiRobot |= 2; antiRobotGo(); document.body.onmousedown=null; } document.body.onmousemove=function(){ antiRobot |= 2; antiRobotGo(); document.body.onmousemove=null; } setTimeout(function(){ antiRobot |= 1; antiRobotGo(); }, 100) antiRobotGo(); } antiRobotDefense(); </script> <h2>SQLite Release 3.8.8.2 On 2015-01-30</h2><p><b>Changes in version 3.8.8 (2015-01-16):</b></p> <p><ol class='lessindent'> <p><b>New Features:</b> <li value='1'>Added the <a href="../pragma.html#pragma_data_version">PRAGMA data_version</a> command that can be used to determine if a database file has been modified by another process. <li>Added the <a href="../c3ref/c_checkpoint_full.html">SQLITE_CHECKPOINT_TRUNCATE</a> option to the <a href="../c3ref/wal_checkpoint_v2.html">sqlite3_wal_checkpoint_v2()</a> interface, with corresponding enhancements to <a href="../pragma.html#pragma_wal_checkpoint">PRAGMA wal_checkpoint</a>. <li>Added the <a href="../c3ref/stmt_scanstatus.html">sqlite3_stmt_scanstatus()</a> interface, available only when compiled with <a href="../compile.html#enable_stmt_scanstatus">SQLITE_ENABLE_STMT_SCANSTATUS</a>. <li>The <a href="../c3ref/table_column_metadata.html">sqlite3_table_column_metadata()</a> is enhanced to work correctly on <a href="../withoutrowid.html">WITHOUT ROWID</a> tables and to check for the existence of a a table if the column name parameter is NULL. The interface is now also included in the build by default, without requiring the <a href="../compile.html#enable_column_metadata">SQLITE_ENABLE_COLUMN_METADATA</a> compile-time option. <li>Added the <a href="../compile.html#enable_api_armor">SQLITE_ENABLE_API_ARMOR</a> compile-time option. <li>Added the <a href="../compile.html#reverse_unordered_selects">SQLITE_REVERSE_UNORDERED_SELECTS</a> compile-time option. <li>Added the <a href="../compile.html#sorter_pmasz">SQLITE_SORTER_PMASZ</a> compile-time option and <a href="../c3ref/c_config_covering_index_scan.html#sqliteconfigpmasz">SQLITE_CONFIG_PMASZ</a> start-time option. <li>Added the <a href="../c3ref/c_config_covering_index_scan.html#sqliteconfigpcachehdrsz">SQLITE_CONFIG_PCACHE_HDRSZ</a> option to <a href="../c3ref/config.html">sqlite3_config()</a> which makes it easier for applications to determine the appropriate amount of memory for use with <a href="../c3ref/c_config_covering_index_scan.html#sqliteconfigpagecache">SQLITE_CONFIG_PAGECACHE</a>. <li>The number of rows in a <a href="../lang_select.html#values">VALUES clause</a> is no longer limited by <a href="../c3ref/c_limit_attached.html#sqlitelimitcompoundselect">SQLITE_LIMIT_COMPOUND_SELECT</a>. <li>Added the <a href="https://www.sqlite.org/src/artifact/f971962e92ebb8b0">eval.c</a> <a href="../loadext.html">loadable extension</a> that implements an eval() SQL function that will recursively evaluate SQL. <p><b>Performance Enhancements:</b> <li>Reduce the number of memcpy() operations involved in balancing a b-tree, for 3.2% overall performance boost. <li>Improvements to cost estimates for the <a href="../optoverview.html#skipscan">skip-scan optimization</a>. <li>The <a href="../optoverview.html#autoindex">automatic indexing</a> optimization is now capable of generating a <a href="../partialindex.html">partial index</a> if that is appropriate. <p><b>Bug fixes:</b> <li>Ensure durability following a power loss with "PRAGMA journal_mode=TRUNCATE" by calling fsync() right after truncating the journal file. <li>The query planner now recognizes that any column in the right-hand table of a LEFT JOIN can be NULL, even if that column has a NOT NULL constraint. Avoid trying to optimize out NULL tests in those cases. Fix for ticket <a href="https://www.sqlite.org/src/info/6f2222d550f5b0ee7ed">6f2222d550f5b0ee7ed</a>. <li>Make sure ORDER BY puts rows in ascending order even if the DISTINCT operator is implemented using a descending index. Fix for ticket <a href="https://www.sqlite.org/src/info/c5ea805691bfc4204b1cb9e">c5ea805691bfc4204b1cb9e</a>. <li>Fix data races that might occur under stress when running with many threads in <a href="../sharedcache.html">shared cache mode</a> where some of the threads are opening and closing connections. <li>Fix obscure crash bugs found by <a href="http://lcamtuf.coredump.cx/afl/">american fuzzy lop</a>. Ticket <a href="https://www.sqlite.org/src/info/a59ae93ee990a55">a59ae93ee990a55</a>. <li>Work around a GCC optimizer bug (for gcc 4.2.1 on MacOS 10.7) that caused the <a href="../rtree.html">R-Tree extension</a> to compute incorrect results when compiled with -O3. <p><b>Other changes:</b> <li>Disable the use of the strchrnul() C-library routine unless it is specifically enabled using the -DHAVE_STRCHRNULL compile-time option. <li>Improvements to the effectiveness and accuracy of the <a href="../lang_corefunc.html#likelihood">likelihood()</a>, <a href="../lang_corefunc.html#likely">likely()</a>, and <a href="../lang_corefunc.html#unlikely">unlikely()</a> SQL hint functions. </ol> <p><b>Additional changes in version 3.8.8.1 (2015-01-20):</b></p> <p><ol class='lessindent'> <li value='22'>Fix a bug in the sorting logic, present since version 3.8.4, that can cause output to appear in the wrong order on queries that contains an ORDER BY clause, a LIMIT clause, and that have approximately 60 or more columns in the result set. Ticket <a href="https://www.sqlite.org/src/tktview?name=f97c4637102a3ae72b79">f97c4637102a3ae72b79</a>. </ol> <p><b>Additional changes in version 3.8.8.2 (2015-01-30):</b></p> <p><ol class='lessindent'> <li value='23'>Enhance <a href="../c3ref/wal_checkpoint_v2.html">sqlite3_wal_checkpoint_v2(TRUNCATE)</a> interface so that it truncates the WAL file even if there is no checkpoint work to be done. <li>SQLITE_SOURCE_ID: "2015-01-30 14:30:45 7757fc721220e136620a89c9d28247f28bbbc098" <li>SHA1 for sqlite3.c: 85ce79948116aa9a087ec345c9d2ce2c1d3cd8af </ol></p> <p>A <a href="../changes.html">complete list of SQLite releases</a> in a single page and a <a href="../chronology.html">chronology</a> are both also available. A detailed history of every check-in is available at <a href="http://www.sqlite.org/src/timeline"> SQLite version control site</a>.</p>