cursor.readConcern()

Definition

cursor.readConcern(level)

Important

mongosh Method

This is a mongosh method. This is not the documentation for Node.js or other programming language specific driver methods.

In most cases, mongosh methods work the same way as the legacy mongo shell methods. However, some legacy methods are unavailable in mongosh.

For the legacy mongo shell documentation, refer to the documentation for the corresponding MongoDB Server release:

• mongo shell v4.4

• mongo shell v4.2

• mongo shell v4.0

For MongoDB API drivers, refer to the language specific MongoDB driver documentation.

New in version 3.2.

Specify a read concern for the db.collection.find() method.

The readConcern() method has the following form:

db.collection.find().readConcern(<level>)

The readConcern() method has the following parameter:

Parameter	Type	Description
level	string	Read concern level. Possible read concern levels are: "local". This is the default read concern level for read operations against the primary and secondaries. "available". Available for read operations against the primary and secondaries. "available" behaves the same as "local" against the primary and non-sharded secondaries. The query returns the instance's most recent data. "majority". Available for replica sets that use WiredTiger storage engine. "linearizable". Available for read operations on the primary only. For more formation on the read concern levels, see Read Concern Levels.

Compatibility

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

• MongoDB Atlas: The fully managed service for MongoDB deployments in the cloud

• MongoDB Enterprise: The subscription-based, self-managed version of MongoDB

• MongoDB Community: The source-available, free-to-use, and self-managed version of MongoDB

Considerations

db.restaurants.find( { _id: 5 } ).readConcern("linearizable").maxTimeMS(10000)