MongoCursor::explain
(PECL mongo >=0.9.2)
MongoCursor::explain — Return an explanation of the query, often useful for optimization and debugging
Descrierea
public MongoCursor::explain
(
) : array
Parametri
Această funcție nu are parametri.
Valorile întoarse
Returns an explanation of the query.
Exemple
Example #1 MongoCursor::explain() example
<?php
$cursor = $collection->find(array("x"=>1), array("y"));
$cursor->sort(array("z" => 1))->limit(4)->skip(5);
var_dump($cursor->explain());
?>
Exemplul de mai sus va afișa ceva similar cu:
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) {
}
}
}
}
Erori/Excepții
Throws MongoConnectionException if it cannot reach the database.
A se vedea și
MongoDB core docs on » explain.
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