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 |
|---|---|---|
| string | Read concern level. Possible read concern levels are:
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
Note
This command is supported in all MongoDB Atlas clusters. For information on Atlas support for all commands, see Unsupported Commands.
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
Read Your Own Writes
You can use causally consistent sessions to read your own writes, if the writes request acknowledgment.
Linearizable Read Concern Performance
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)