applyOps¶

applyOps¶

Applies specified oplog entries to a mongod instance. The applyOps command is primarily an internal command to support sharded clusters.

The applyOps command has the following prototype form:

db.runCommand( { applyOps: [ <operations> ],
                 preCondition: [ { ns: <namespace>, q: <query>, res: <result> } ] } )

The applyOps command takes a document with the following fields:

Field	Type	Description
`applyOps`	array	The oplog entries to apply.
`preCondition`	array	Optional. An array of documents that contain the conditions that must be true in order to apply the oplog entry. Each document contains a set of conditions, as described in the next table.

The preCondition array takes one or more documents with the following fields:

Field	Type	Description
`ns`	string	A namespace. If you use this field, `applyOps` applies oplog entries only for the collection described by this namespace.
`q`	string	Specifies the query that produces the results specified in the `res` field.
`res`	string	The results of the query in the `q` field that must match to apply the oplog entry.

Warning

This command obtains a global write lock and will block other operations until it has completed.

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