Mongo.setWriteConcern()

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Definition

Mongo.setWriteConcern()

Sets the write concern for the Mongo() connection object.

See the Write Concern for an introduction to write concerns in MongoDB.

The command takes the following form:

db.getMongo().setWriteConcern( { w: <value>, j: <boolean>, wtimeout: <number> } )

The fields are:

Field	Description
`w`	The number of `mongod` or `mongod` instances that must acknowledge a write. Possible values are: "majority". A majority of the target instances must acknowledge the write. <number>. The specified number of target instances must acknowledge the write. <custom write concern name>. A user defined write concern, the tagged instances must acknowledge the write. See write concern specification for details.
`j`	A boolean value. `j: true` requests acknowledgment that the write operation has been written to the on-disk journal.
`wtimeout`	The number of milliseconds to wait for acknowledgement of the write concern. `wtimeout` is only applicable when `w` has a value greater than `1`.

In the following example:

db.getMongo().setWriteConcern( { w: 2, wtimeout: 1000 } )