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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"><html><head><title>Memory Allocator Statistics</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>Memory Allocator Statistics</h2><blockquote><pre>sqlite3_int64 sqlite3_memory_used(void);sqlite3_int64 sqlite3_memory_highwater(int resetFlag);</pre></blockquote><p>SQLite provides these two interfaces for reporting on the statusof the <a href="../c3ref/free.html">sqlite3_malloc()</a>, <a href="../c3ref/free.html">sqlite3_free()</a>, and <a href="../c3ref/free.html">sqlite3_realloc()</a>the memory allocation subsystem included within the SQLite.</p><p><h3>Invariants:</h3><table border="0" cellpadding="5" cellspacing="0"><tr><td valign="top">F17371</td> <td valign="top">The <a href="../c3ref/memory_highwater.html">sqlite3_memory_used()</a> routine returns thenumber of bytes of memory currently outstanding(malloced but not freed).</td></tr><tr><td valign="top">F17373</td> <td valign="top">The <a href="../c3ref/memory_highwater.html">sqlite3_memory_highwater()</a> routine returns the maximumvalue of <a href="../c3ref/memory_highwater.html">sqlite3_memory_used()</a>since the highwater mark was last reset.</td></tr><tr><td valign="top">F17374</td> <td valign="top">The values returned by <a href="../c3ref/memory_highwater.html">sqlite3_memory_used()</a> and<a href="../c3ref/memory_highwater.html">sqlite3_memory_highwater()</a> include any overheadadded by SQLite in its implementation of <a href="../c3ref/free.html">sqlite3_malloc()</a>,but not overhead added by the any underlying system libraryroutines that <a href="../c3ref/free.html">sqlite3_malloc()</a> may call.</td></tr><tr><td valign="top">F17375</td> <td valign="top">The memory highwater mark is reset to the current value of<a href="../c3ref/memory_highwater.html">sqlite3_memory_used()</a> if and only if the parameter to<a href="../c3ref/memory_highwater.html">sqlite3_memory_highwater()</a> is true. The value returnedby <a href="../c3ref/memory_highwater.html">sqlite3_memory_highwater(1)</a> is the highwater markprior to the reset.</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 2008/05/12 13:08:44 UTC</i></small></div></body></html>⌨️ 快捷键说明
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