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Showing content from https://www.mongodb.com/docs/atlas/unsupported-commands/ below:

Unsupported Commands in Atlas - Atlas

Atlas M0 Free clusters and Flex clusters don't support all functionality available to other clusters. To learn more about M0 cluster limits, see Atlas M0 (Free Cluster) Limits. To learn more about Flex cluster limits, see Atlas Flex Limitations.

If you use an unsupported command or invalid syntax, Atlas returns the following error message:

 <$command> is not allowed or the syntax is incorrect, see the Atlas documentation for more information.

To learn more about valid syntax, see Database Commands

You can run the following commands with limits in M0 Free clusters and Flex clusters:

Command

Limit

aggregate

• Limits the maxTimeMs parameter to 300 seconds (300000).

• Ignores the allowDiskUse parameter.

• Doesn't support $accumulator and $function operators.

• Doesn't support the $$USER_ROLES system variable.

count

• Doesn't support the $where operator.

• Limits the count operation on the local database to the system.replset and oplog.rs collections.

dbStats

M0 Free clusters and Flex clusters don't allow the dbStats command on the local and config databases.

To learn more, see Operational Limits.

distinct

Doesn't support $where operator.

find

• Doesn't support the $where operator.

• Doesn't support the $$USER_ROLES system variable.

• Ignores the allowDiskUse parameter.

• 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" }

getParameter

Limits execution to these two documents:

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

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

db.killOp()

Limits the db.killOp() method to the MongoDB user who ran the operation.

collection.updateOne()

Doesn't support the $$USER_ROLES system variable.

collection.updateMany()

Doesn't support the $$USER_ROLES system variable.

findAndModify

Doesn't support the $$USER_ROLES system variable.

serverStatus

Limits response to the following fields:

• $clusterTime.clusterTime

• $clusterTime.operationTime

• $clusterTime.signature.hash

• $clusterTime.signature.keyId

• $clusterTime.signature

• asserts.msg

• asserts.regular

• asserts.rollovers

• asserts.user

• asserts.warning

• atlasVersion.gitVersion

• atlasVersion.version

• connections.available

• connections.current

• connections.totalCreated

• extra_info.note

• extra_info.page_faults

• host

• localTime

• mem.bits

• mem.mapped

• mem.mappedWithJournal

• mem.resident

• mem.supported

• mem.virtual

• metrics.atlas.bytesInWrites

• metrics.atlas.connectionPool.totalCreated

• network.bytesIn

• network.bytesOut

• network.numRequests

• ok

• opcounters.command

• opcounters.delete

• opcounters.getmore

• opcounters.insert

• opcounters.query

• opcounters.update

• opcountersRepl.command

• opcountersRepl.delete

• opcountersRepl.getmore

• opcountersRepl.insert

• opcountersRepl.query

• opcountersRepl.update

• pid

• process

• repl.electionId

• repl.hosts[]

• repl.ismaster

• repl.lastWrite.lastWriteDate

• repl.lastWrite.majorityOpTime.t

• repl.lastWrite.majorityOpTime.ts

• repl.lastWrite.majorityWriteDate

• repl.lastWrite.opTime.t

• repl.lastWrite.opTime.ts

• repl.me

• repl.primary

• repl.rbid

• repl.secondary

• repl.setName

• repl.setVersion

• repl.tags.nodeType

• repl.tags.provider

• repl.tags.region

• repl.tags

• storageEngine.backupCursorOpen

• storageEngine.dropPendingIdents

• storageEngine.name

• storageEngine.oldestRequiredTimestampForCrashRecovery

• storageEngine.persistent

• storageEngine.readOnly

• storageEngine.supportsCommittedReads

• storageEngine.supportsPendingDrops

• storageEngine.supportsSnapshotReadConcern

• uptime

• uptimeEstimate

• uptimeMillis

• version

M0 Free clusters and Flex clusters don't support the following commands:

The commands available for clusters of all other tiers, M10 and larger, correspond to the privileges defined for the built-in Atlas MongoDB roles. To learn more about permissions, see Atlas User Privileges.

M0 Free clusters and Flex clusters don't support the following command line tool options:

For more information, see M0 Cluster Limits.

Atlas requires clients to authenticate to access an Atlas cluster. Atlas provides a curated list of Database User Privileges. These privileges provide access to a subset of MongoDB commands.

Atlas limits the db.killOp() method to the MongoDB user who ran the operation.

Atlas supports the following sharding command on only M30+ sharded clusters:

The following table lists the most common commands and shell methods that database user privileges do not support. To ensure cluster stability and performance, Atlas subsumes or restricts the functionality that these commands provide.

M10+ clusters don't support the --preserveUUID option for mongorestore.

Contact Atlas support if your use case requires access to a command that the Atlas database user privileges don't currently support.

Atlas Serverless instances don't support the following database commands and mongosh shell methods:

Flex Clusters and Serverless instances don't support the following command line tool options:

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