142 lines
5.4 KiB
HTML
142 lines
5.4 KiB
HTML
<!DOCTYPE html>
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<html><head>
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<link href="../sqlite.css" rel="stylesheet">
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<title>Enable Or Disable Shared Pager Cache</title>
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<!-- path=../ -->
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</head>
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<body>
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<div class=nosearch>
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<a href="../index.html">
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<img class="logo" src="../images/sqlite370_banner.gif" alt="SQLite" border="0">
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</a>
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<div><!-- IE hack to prevent disappearing logo --></div>
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<div class="tagline desktoponly">
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Small. Fast. Reliable.<br>Choose any three.
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</div>
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<div class="menu mainmenu">
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<ul>
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<li><a href="../index.html">Home</a>
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<li class='mobileonly'><a href="javascript:void(0)" onclick='toggle_div("submenu")'>Menu</a>
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<li class='wideonly'><a href='../about.html'>About</a>
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<li class='desktoponly'><a href="../docs.html">Documentation</a>
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<li class='desktoponly'><a href="../download.html">Download</a>
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<li class='wideonly'><a href='../copyright.html'>License</a>
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<li class='desktoponly'><a href="../support.html">Support</a>
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<li class='desktoponly'><a href="../prosupport.html">Purchase</a>
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<li class='search' id='search_menubutton'>
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<a href="javascript:void(0)" onclick='toggle_search()'>Search</a>
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</ul>
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</div>
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<div class="menu submenu" id="submenu">
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<ul>
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<li><a href='../about.html'>About</a>
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<li><a href='../docs.html'>Documentation</a>
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<li><a href='../download.html'>Download</a>
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<li><a href='../support.html'>Support</a>
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<li><a href='../prosupport.html'>Purchase</a>
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</ul>
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</div>
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<div class="searchmenu" id="searchmenu">
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<form method="GET" action="../search">
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<select name="s" id="searchtype">
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<option value="d">Search Documentation</option>
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<option value="c">Search Changelog</option>
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</select>
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<input type="text" name="q" id="searchbox" value="">
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<input type="submit" value="Go">
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</form>
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</div>
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</div>
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<script>
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function toggle_div(nm) {
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var w = document.getElementById(nm);
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if( w.style.display=="block" ){
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w.style.display = "none";
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}else{
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w.style.display = "block";
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}
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}
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function toggle_search() {
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var w = document.getElementById("searchmenu");
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if( w.style.display=="block" ){
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w.style.display = "none";
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} else {
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w.style.display = "block";
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setTimeout(function(){
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document.getElementById("searchbox").focus()
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}, 30);
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}
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}
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function div_off(nm){document.getElementById(nm).style.display="none";}
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window.onbeforeunload = function(e){div_off("submenu");}
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/* Disable the Search feature if we are not operating from CGI, since */
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/* Search is accomplished using CGI and will not work without it. */
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if( !location.origin || !location.origin.match || !location.origin.match(/http/) ){
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document.getElementById("search_menubutton").style.display = "none";
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}
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/* Used by the Hide/Show button beside syntax diagrams, to toggle the */
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function hideorshow(btn,obj){
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var x = document.getElementById(obj);
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var b = document.getElementById(btn);
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if( x.style.display!='none' ){
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x.style.display = 'none';
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b.innerHTML='show';
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}else{
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x.style.display = '';
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b.innerHTML='hide';
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}
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return false;
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}
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</script>
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</div>
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<!-- keywords: sqlite3_enable_shared_cache -->
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<div class=nosearch>
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<a href="intro.html"><h2>SQLite C Interface</h2></a>
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<h2>Enable Or Disable Shared Pager Cache</h2>
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</div>
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<blockquote><pre>
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int sqlite3_enable_shared_cache(int);
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</pre></blockquote>
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<p>
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This routine enables or disables the sharing of the database cache
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and schema data structures between <a href="../c3ref/sqlite3.html">connections</a>
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to the same database. Sharing is enabled if the argument is true
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and disabled if the argument is false.</p>
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<p>Cache sharing is enabled and disabled for an entire process.
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This is a change as of SQLite <a href="../releaselog/3_5_0.html">version 3.5.0</a> (2007-09-04).
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In prior versions of SQLite,
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sharing was enabled or disabled for each thread separately.</p>
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<p>The cache sharing mode set by this interface effects all subsequent
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calls to <a href="../c3ref/open.html">sqlite3_open()</a>, <a href="../c3ref/open.html">sqlite3_open_v2()</a>, and <a href="../c3ref/open.html">sqlite3_open16()</a>.
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Existing database connections continue to use the sharing mode
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that was in effect at the time they were opened.</p>
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<p>This routine returns <a href="../rescode.html#ok">SQLITE_OK</a> if shared cache was enabled or disabled
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successfully. An <a href="../rescode.html">error code</a> is returned otherwise.</p>
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<p>Shared cache is disabled by default. It is recommended that it stay
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that way. In other words, do not use this routine. This interface
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continues to be provided for historical compatibility, but its use is
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discouraged. Any use of shared cache is discouraged. If shared cache
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must be used, it is recommended that shared cache only be enabled for
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individual database connections using the <a href="../c3ref/open.html">sqlite3_open_v2()</a> interface
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with the <a href="../c3ref/c_open_autoproxy.html">SQLITE_OPEN_SHAREDCACHE</a> flag.</p>
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<p>Note: This method is disabled on MacOS X 10.7 and iOS version 5.0
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and will always return SQLITE_MISUSE. On those systems,
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shared cache mode should be enabled per-database connection via
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<a href="../c3ref/open.html">sqlite3_open_v2()</a> with <a href="../c3ref/c_open_autoproxy.html">SQLITE_OPEN_SHAREDCACHE</a>.</p>
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<p>This interface is threadsafe on processors where writing a
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32-bit integer is atomic.</p>
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<p>See Also: <a href="../sharedcache.html">SQLite Shared-Cache Mode</a>
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</p><p>See also lists of
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<a href="objlist.html">Objects</a>,
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<a href="constlist.html">Constants</a>, and
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<a href="funclist.html">Functions</a>.</p>
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