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Command Limitations in Free Tier Clusters

Atlas Free Tier clusters do not support all functionality available to other clusters.

Important

Free Tier clusters do not support read or write operations on the admin database.

Commands With Special Behavior

The following commands exhibit special behavior in Free Tier clusters.

Command	Description
aggregate	The following limitations apply: The maxTimeMs parameter cannot exceed 600 seconds. The allowDiskUsage parameter is ignored.
count	The following limitations apply: The $where operator is not supported. When run against the local database, you can execute count only on the system.replset and oplog.rs collections.
distinct	The $where operator is not supported.
find	The following limitations apply: The $where operator is not supported. In the local database, you can run find only on the oplog.rs collection. When querying the oplog.rs collection, if you specify a condition on the ns field, you must specify an equality condition, such as ns: "test.foo". You cannot use $regex or any other operator with the ns field.
getParameter	Can be executed in a Free Tier cluster in only two variations: {getParameter: 1, authSchemaVersion: 1} {getParameter: 1, authenticationMechanisms: 1}
killOp	All MongoDB users associated with a Free Tier account can execute the killOp command to terminate operations by all other MongoDB users associated with the same account.
serverStatus	The data returned by the following sections is not meaningful: asserts extra_info mem opcountersRepl The following sections are not supported: backgroundFlushing dur encryptionAtRest security advisoryHostFQDNs tcmalloc oplog rangeDeleter The metrics field is replaced with the following: "metrics": { "connectionPool": { "totalCreated": [total-created-number] }, "bytesInWrites": [current-bytes-in-writes-value-since-last-check] }

Unsupported Commands

The following commands are not supported.

applyOps appendOplogNote authenticate authSchemaUpgrade checkShardingIndex cleanupOrphaned clone cloneCollection cloneCollectionAsCapped compact connPoolSync copydb copydbgetnonce copydbsaslstart createRole createUser currentOpCtx dataSize dbHash diagLogging dropAllRolesFromDatabase dropAllUsersFromDatabase dropRole eval forcerror fsync fsyncUnlock getDiagnosticData

getPrevError getShardMap getShardVersion grantPrivilegesToRole grantRolesToRole grantRolesToUser handshake invalidateUserCache lockInfo logRotate mapreduce mapreduce.shardedfinish parallelCollectionScan planCacheClear planCacheClearFilters planCacheListFilters planCacheListPlans planCacheListQueryShapes planCacheSetFilter revokeRolesFromUser repairCursor repairDatabase replSetDeclareElectionWinner replSetElect replSetFreeze replSetFresh replSetGetConfig replSetGetRBID

replSetGetStatus replSetHeartbeat replSetInitiate replSetMaintenance replSetReconfig replSetRequestVotes replSetStepDown replSetStepUp replSetSyncFrom replSetUpdatePosition resetError resync revokePrivilegesFromRole revokeRolesFromRole setFeatureCompatibilityVersion setLogLevel setParameter setProfilingLevel shutdown updateRole updateUser validate _migrateClone _recvChunkAbort _recvChunkCommit _recvChunkStart _recvChunkStatus _transferMods

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