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.

This method is available in deployments hosted in the following environments:

MongoDB Enterprise: The subscription-based, self-managed version of MongoDB
MongoDB Community: The source-available, free-to-use, and self-managed version of 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 acknowledgment 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 } )