aggregate()

MongoDB Driver Function Reference

Runs an (admin/diagnostic) aggregation that does not require a collection.
More information can be found in the corresponding entry of the MongoDB Manual.

db.aggregate([<pipeline>[, <options>]])

Arguments

<pipeline>		An array of BSON documents specifying the aggregation pipline.
<options>		A BOSN document specifying options.

Options

{ allowDiskUse: <boolean>, batchSize: <int>, comment: <string>, maxAwaitTime: <long>,
collation: <document>, hint: <document>, bypass }

allowDiskUse		Allows to write to disk while executing.
batchSize		Sets the batch size.
bypassDocumentValidation		Document validation will be bypassed (default; false).
comment		Sets the comment.
maxAwaitTime		Sets the maximum await time (in milliseconds).
collation		A document specifying the collation.
hint		A document specifying a hint.

Return Value

Returns a result set (cursor).

Example

db.aggregate([{ $currentOp : { allUsers: true, idleConnections: true } }, { $match : { shard: "shard01" } }]);

Runs the currentOp operation and filters the results.

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