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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 301119 $ -->
<refentry xml:id="mongocursor.explain" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
<refnamediv>
<refname>MongoCursor::explain</refname>
<refpurpose>Return an explanation of the query, often useful for optimization and debugging</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<modifier>public</modifier> <type>array</type><methodname>MongoCursor::explain</methodname>
<void/>
</methodsynopsis>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
&no.function.parameters;
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns an explanation of the query.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<example>
<title><function>MongoCursor::explain</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
$cursor = $collection->find(array("x"=>1), array("y"));
$cursor->sort(array("z" => 1))->limit(4)->skip(5);
var_dump($cursor->explain());
?>
]]>
</programlisting>
&example.outputs.similar;
<screen>
<![CDATA[
array(8) {
["cursor"]=>
string(15) "BtreeCursor x_1"
["startKey"]=>
array(1) {
["x"]=>
int(1)
}
["endKey"]=>
array(1) {
["x"]=>
int(1)
}
["nscanned"]=>
float(4)
["n"]=>
int(4)
["scanAndOrder"]=>
int(1)
["millis"]=>
int(3)
["allPlans"]=>
array(2) {
[0]=>
array(3) {
["cursor"]=>
string(15) "BtreeCursor x_1"
["startKey"]=>
array(1) {
["x"]=>
int(1)
}
["endKey"]=>
array(1) {
["x"]=>
int(1)
}
}
[1]=>
array(3) {
["cursor"]=>
string(11) "BasicCursor"
["startKey"]=>
array(0) {
}
["endKey"]=>
array(0) {
}
}
}
}
]]>
</screen>
</example>
</refsect1>
<refsect1 role="errors">
&reftitle.errors;
<para>
Throws <classname>MongoConnectionException</classname> if it cannot reach the
database.
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
MongoDB core docs on <link xlink:href="&url.mongodb.dochub.explain;">explain</link>.
</para>
</refsect1>
</refentry>
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|
