Docs Menu

cursor.readConcern()

cursor.readConcern(level)

Important

mongosh Method

This page documents a mongosh method. This is not the documentation for a language-specific driver, such as Node.js.

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

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:

For more formation on the read concern levels, see Read Concern Levels.

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

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

Note

This command is supported in all MongoDB Atlas clusters. For information on Atlas support for all commands, see Unsupported Commands.

You can use causally consistent sessions to read your own writes, if the writes request acknowledgment.

When specifying linearizable read concern, always use maxTimeMS() in case a majority of data bearing members are unavailable.

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

Tip

See also: