<html dir="LTR" xmlns="http://www.w3.org/1999/xhtml" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:MSHelp="http://msdn.microsoft.com/mshelp" xmlns:tool="http://www.microsoft.com/tooltip" xmlns:ndoc="urn:ndoc-preprocess">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=Windows-1252" />
<title>ANALYZE</title>
<link rel="stylesheet" type="text/css" href="ndoc.css"> </link>
<link rel="stylesheet" type="text/css" href="user.css"> </link>
<script type="text/javascript" src="ndoc.js"> </script>
</head>
<body style="display: none;">
<input type="hidden" id="userDataCache" class="userDataStyle" />
<input type="hidden" id="hiddenScrollOffset" />
<img id="dropDownImage" style="display:none; height:0; width:0;" src="drpdown.gif" />
<img id="dropDownHoverImage" style="display:none; height:0; width:0;" src="drpdown_orange.gif" />
<img id="collapseImage" style="display:none; height:0; width:0;" src="collapse.gif" />
<img id="expandImage" style="display:none; height:0; width:0;" src="exp.gif" />
<img id="collapseAllImage" style="display:none; height:0; width:0;" src="collall.gif" />
<img id="expandAllImage" style="display:none; height:0; width:0;" src="expall.gif" />
<img id="copyImage" style="display:none; height:0; width:0;" src="copycode.gif" />
<img id="copyHoverImage" style="display:none; height:0; width:0;" src="copycodeHighlight.gif" />
<div id="header">
<table width="100%" id="topTable">
<tr id="headerTableRow1">
<td align="left">
<span id="runningHeaderText">ANALYZE</span> </td>
</tr>
<tr id="headerTableRow2">
<td align="left">
<span id="nsrTitle">SQLite Language Reference Documentation</span>
</td>
</tr>
<tr id="headerTableRow3" style="display:none">
<td>
<a id="seeAlsoSectionLink" href="#seeAlsoToggle" onclick="OpenSection(seeAlsoToggle)">See Also</a>
<a id="exampleSectionLink" href="#codeExampleToggle" onclick="OpenSection(codeExampleToggle)">Example</a>
</td>
</tr>
</table>
<table width="100%" id="bottomTable" cellspacing="0" cellpadding="0" style="display:none">
<tr>
<td>
<span onclick="ExpandCollapseAll(toggleAllImage)" style="cursor:default;" onkeypress="ExpandCollapseAll_CheckKey(toggleAllImage)" tabindex="0">
<img ID="toggleAllImage" class="toggleAll" src="collall.gif" />
<label id="collapseAllLabel" for="toggleAllImage" style="display: none;">
Collapse All
</label>
<label id="expandAllLabel" for="toggleAllImage" style="display: none;">
Expand All
</label>
</span>
</td>
</tr>
</table>
</div>
<div id="mainSection">
<div id="mainBody">
<h1 class="heading">
SQL As Understood By SQLite</h1>
<h4>
ANALYZE</h4>
<p>
<table cellpadding="10">
<tr>
<td align="right" width="1%" nowrap>
<i><font color="#ff3434">sql-statement</font></i> ::=</td>
<td>
<b><font color="#2c2cf0">ANALYZE</font></b></td>
</tr>
</table>
<table cellpadding="10">
<tr>
<td align="right" width="1%" nowrap>
<i><font color="#ff3434">sql-statement</font></i> ::=</td>
<td>
<b><font color="#2c2cf0">ANALYZE </font></b><i><font color="#ff3434">database-name</font></i><b><font
color="#2c2cf0"></font></b></td>
</tr>
</table>
<table cellpadding="10">
<tr>
<td align="right" width="1%" nowrap>
<i><font color="#ff3434">sql-statement</font></i> ::=</td>
<td>
<b><font color="#2c2cf0">ANALYZE </font></b>[<b><font color="#2c2cf0"></font></b><i><font
color="#ff3434">database-name</font></i><b><font color="#2c2cf0"> <big>.</big></font></b>]<b><font
color="#2c2cf0"> </font></b><i><font color="#ff3434">table-name</font></i><b><font
color="#2c2cf0"></font></b></td>
</tr>
</table>
</p>
<p>
The ANALYZE command gathers statistics about indices and stores them in a special
tables in the database where the query optimizer can use them to help make better
index choices. If no arguments are given, all indices in all attached databases
are analyzed. If a database name is given as the argument, all indices in that one
database are analyzed. If the argument is a table name, then only indices associated
with that one table are analyzed.</p>
<p>
The initial implementation stores all statistics in a single table named <b>sqlite_stat1</b>.
Future enhancements may create additional tables with the same name pattern except
with the "1" changed to a different digit. The <b>sqlite_stat1</b> table cannot be <a href="lang_droptable.html">DROP</a>ped, but all the content can be <a href="lang_delete.html">
DELETE</a>d which has the same effect.</p>
<p>
</p>
<hr>
<div id="footer">
<p>
</p>
<p>
</p>
</div>
</div>
</div>
</body>
</html>
