Release Notes for MongoDB 6.2

Patch Releases

Collection Validation

Starting in MongoDB 6.2, the validate command and db.collection.validate() method:

• Check collections to ensure the BSON documents conform to the BSON specifications.

• Check time series collections for internal data inconsistencies.

• Have a new option checkBSONConformance that enables comprehensive BSON checks.

Sharding

Starting in version 6.2, MongoDB removes the maxSize field from the addShard command. As a result:

• Running addShard with the maxSize field returns an InvalidOptions error.

• New documents in the shards collection no longer include the maxSize field.

• Any pre-existing maxSize field entries are ignored.

taskExecutorPoolSize Setting on Linux

When running MongoDB 6.2 or newer on Linux, you cannot modify the taskExecutorPoolSize from the default value of 1. You may modify this parameter when running MongoDB on Windows or macOS.

serverStatus Metrics

Starting in MongoDB 6.2, the serverStatus command output includes these new fields:

• metrics.query.sort

• metrics.query.sort.spillToDisk

• metrics.query.sort.totalBytesSorted

• metrics.query.sort.totalKeysSorted

Starting in MongoDB 6.2, the serverStatus command and the db.serverStatus() method report the opLatencies metric for mongos instances. Latencies reported by mongos include operation latency time and communication time between the mongod and mongos instances.

Server Parameters

Starting in MongoDB 6.2, mongod adds these parameters:

• transactionTooLargeForCacheThreshold

Deprecated Commands

Starting in MongoDB 6.2, the following database commands are deprecated:

• collStats

• currentOp

Report an Issue

To report an issue, see https://github.com/mongodb/mongo/wiki/Submit-Bug-Reports for instructions on how to file a JIRA ticket for the MongoDB server or one of the related projects.