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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"><html><head><title>Enable Or Disable Shared Pager Cache</title><style type="text/css">body { margin: auto; font-family: "Verdana" "sans-serif"; padding: 8px 1%;}a { color: #45735f }a:visited { color: #734559 }.logo { position:absolute; margin:3px; }.tagline { float:right; text-align:right; font-style:italic; width:240px; margin:12px; margin-top:58px;}.toolbar { font-variant: small-caps; text-align: center; line-height: 1.6em; margin: 0; padding:1px 8px;}.toolbar a { color: white; text-decoration: none; padding: 6px 12px; }.toolbar a:visited { color: white; }.toolbar a:hover { color: #80a796; background: white; }.content { margin: 5%; }.content dt { font-weight:bold; }.content dd { margin-bottom: 25px; margin-left:20%; }.content ul { padding:0px; padding-left: 15px; margin:0px; }/* rounded corners */.se { background: url(../images/se.png) 100% 100% no-repeat #80a796}.sw { background: url(../images/sw.png) 0% 100% no-repeat }.ne { background: url(../images/ne.png) 100% 0% no-repeat }.nw { background: url(../images/nw.png) 0% 0% no-repeat }</style><meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head><body><div><!-- container div to satisfy validator --><a href="../index.html"><img class="logo" src="../images/SQLite.gif" alt="SQLite Logo" border="0"></a><div><!-- IE hack to prevent disappearing logo--></div><div class="tagline">Small. Fast. Reliable.<br>Choose any three.</div><table width=100% style="clear:both"><tr><td> <div class="se"><div class="sw"><div class="ne"><div class="nw"> <div class="toolbar"> <a href="../about.html">About</a> <a href="../sitemap.html">Sitemap</a> <a href="../docs.html">Documentation</a> <a href="../download.html">Download</a> <a href="../copyright.html">License</a> <a href="../news.html">News</a> <a href="http://www.sqlite.org/cvstrac/index">Developers</a> <a href="../support.html">Support</a> </div></div></div></div></div></td></tr></table> <a href="intro.html"><h2>SQLite C Interface</h2></a><h2>Enable Or Disable Shared Pager Cache</h2><blockquote><pre>int sqlite3_enable_shared_cache(int);</pre></blockquote><p>This routine enables or disables the sharing of the database cacheand schema data structures between <a href="../c3ref/sqlite3.html">connections</a>to the same database. Sharing is enabled if the argument is trueand disabled if the argument is false.</p><p>Cache sharing is enabled and disabled for an entire process.This is a change as of SQLite version 3.5.0. In prior versions of SQLite,sharing was enabled or disabled for each thread separately.</p><p>The cache sharing mode set by this interface effects all subsequentcalls 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>.Existing database connections continue use the sharing modethat was in effect at the time they were opened.</p><p>Virtual tables cannot be used with a shared cache. When sharedcache is enabled, the <a href="../c3ref/create_module.html">sqlite3_create_module()</a> API used to registervirtual tables will always return an error.</p><p>This routine returns <a href="../c3ref/c_abort.html">SQLITE_OK</a> if shared cache was enabled or disabledsuccessfully. An <a href="../c3ref/c_abort.html">error code</a> is returned otherwise.</p><p>Shared cache is disabled by default. But this might change infuture releases of SQLite. Applications that care about sharedcache setting should set it explicitly.</p><p><h3>Invariants:</h3><table border="0" cellpadding="5" cellspacing="0"><tr><td valign="top">H10331</td> <td valign="top">A successful invocation of <a href="../c3ref/enable_shared_cache.html">sqlite3_enable_shared_cache(B)</a>will enable or disable shared cache mode for any subsequentlycreated <a href="../c3ref/sqlite3.html">database connection</a> in the same process.</td></tr><tr><td valign="top">H10336</td> <td valign="top">When shared cache is enabled, the <a href="../c3ref/create_module.html">sqlite3_create_module()</a>interface will always return an error.</td></tr><tr><td valign="top">H10337</td> <td valign="top">The <a href="../c3ref/enable_shared_cache.html">sqlite3_enable_shared_cache(B)</a> interface returns<a href="../c3ref/c_abort.html">SQLITE_OK</a> if shared cache was enabled or disabled successfully.</td></tr><tr><td valign="top">H10339</td> <td valign="top">Shared cache is disabled by default.</td></tr></table></p><p>See also lists of <a href="objlist.html">Objects</a>, <a href="constlist.html">Constants</a>, and <a href="funclist.html">Functions</a>.</p><hr><small><i>This page last modified 2008/12/09 18:44:04 UTC</i></small></div></body></html>⌨️ 快捷键说明
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