Unsupported Commands in M0/M2/M5 Clusters¶

• Limits the maxTimeMs parameter to 300 seconds (300000).
• Ignores the allowDiskUsage parameter.
• Doesn't support $accumulator and $function operators.

• Doesn't support the $where operator.
• Limits the count operation on the local database to the system.replset and oplog.rs collections.

• Doesn't support the $where operator.
• Limits the find operation on the local database to the oplog.rs collection.

• Limits the find operation to using an equality condition when querying the ns field in the oplog.rs collection on the local database.

  { "ns" : "test.foo" }

Limits execution to these two documents:

• { "getParameter": 1, "authSchemaVersion": 1 }
• { "getParameter": 1, "authenticationMechanisms": 1 }

Limits response to the following fields:

Limits to the following document:

{ "user": "<MYUSER>", "db": "admin" }