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Database Commands

All command documentation outlined below describes a command and its available parameters and provides a document template or prototype for each command. Some command documentation also includes the relevant mongo shell helpers.

To run a command against the current database, use db.runCommand():

db.runCommand( { <command> } )

To run an administrative command against the admin database, use db.adminCommand():

db.adminCommand( { <command> } )


For details on specific commands, including syntax and examples, click on the specific command to go to its reference page.

Command Syntax

When you run a database command, you specify the command as a document to db.runCommand(). The document’s key is the command to run, and the value is typically supplied as 1. The value does not affect the output of the command for example:

db.runCommand( { hello: 1 } )

User Commands

Aggregation Commands

Name Description
aggregate Performs aggregation tasks such as $group using an aggregation pipeline.
count Counts the number of documents in a collection or a view.
distinct Displays the distinct values found for a specified key in a collection or a view.
mapReduce Performs map-reduce aggregation for large data sets.

Geospatial Commands

Name Description
geoSearch Performs a geospatial query that uses MongoDB’s haystack index functionality.

Query and Write Operation Commands

Name Description
delete Deletes one or more documents.
find Selects documents in a collection or a view.
findAndModify Returns and modifies a single document.
getLastError Returns the success status of the last operation.
getMore Returns batches of documents currently pointed to by the cursor.
insert Inserts one or more documents.
resetError Deprecated. Resets the last error status.
update Updates one or more documents.

Query Plan Cache Commands

Name Description
planCacheClear Removes cached query plan(s) for a collection.
planCacheClearFilters Clears index filter(s) for a collection.
planCacheListFilters Lists the index filters for a collection.
planCacheListPlans Displays the cached query plans for the specified query shape.
planCacheListQueryShapes Displays the query shapes for which cached query plans exist.
planCacheSetFilter Sets an index filter for a collection.

Database Operations

Authentication Commands

Name Description
authenticate Starts an authenticated session using a username and password.
getnonce This is an internal command to generate a one-time password for authentication.
logout Terminates the current authenticated session.

User Management Commands

Name Description
createUser Creates a new user.
dropAllUsersFromDatabase Deletes all users associated with a database.
dropUser Removes a single user.
grantRolesToUser Grants a role and its privileges to a user.
revokeRolesFromUser Removes a role from a user.
updateUser Updates a user’s data.
usersInfo Returns information about the specified users.

Role Management Commands

Name Description
createRole Creates a role and specifies its privileges.
dropRole Deletes the user-defined role.
dropAllRolesFromDatabase Deletes all user-defined roles from a database.
grantPrivilegesToRole Assigns privileges to a user-defined role.
grantRolesToRole Specifies roles from which a user-defined role inherits privileges.
invalidateUserCache Flushes the in-memory cache of user information, including credentials and roles.
revokePrivilegesFromRole Removes the specified privileges from a user-defined role.
revokeRolesFromRole Removes specified inherited roles from a user-defined role.
rolesInfo Returns information for the specified role or roles.
updateRole Updates a user-defined role.

Replication Commands

Name Description
applyOps Internal command that applies oplog entries to the current data set.
hello Displays information about this member’s role in the replica set, including whether it is the primary.
isMaster Deprecated. Use hello instead.
replSetAbortPrimaryCatchUp Forces the elected primary to abort sync (catch up) then complete the transition to primary.
replSetFreeze Prevents the current member from seeking election as primary for a period of time.
replSetGetConfig Returns the replica set’s configuration object.
replSetGetStatus Returns a document that reports on the status of the replica set.
replSetInitiate Initializes a new replica set.
replSetMaintenance Enables or disables a maintenance mode, which puts a secondary node in a RECOVERING state.
replSetReconfig Applies a new configuration to an existing replica set.
replSetResizeOplog Dynamically resizes the oplog for a replica set member. Available for WiredTiger storage engine only.
replSetStepDown Forces the current primary to step down and become a secondary, forcing an election.
replSetSyncFrom Explicitly override the default logic for selecting a member to replicate from.

See also

Replication for more information regarding replication.

Sharding Commands

Name Description
addShard Adds a shard to a sharded cluster.
addShardToZone Associates a shard with a zone. Supports configuring zones in sharded clusters.
balancerStart Starts a balancer thread.
balancerStatus Returns information on the balancer status.
balancerStop Stops the balancer thread.
checkShardingIndex Internal command that validates index on shard key.
clearJumboFlag Clears the jumbo flag for a chunk.
cleanupOrphaned Removes orphaned data with shard key values outside of the ranges of the chunks owned by a shard.
enableSharding Enables sharding on a specific database.
flushRouterConfig Forces a mongod/mongos instance to update its cached routing metadata.
getShardMap Internal command that reports on the state of a sharded cluster.
getShardVersion Internal command that returns the config server version.
isdbgrid Verifies that a process is a mongos.
listShards Returns a list of configured shards.
medianKey Deprecated internal command. See splitVector.
moveChunk Internal command that migrates chunks between shards.
movePrimary Reassigns the primary shard when removing a shard from a sharded cluster.
mergeChunks Provides the ability to combine chunks on a single shard.
removeShard Starts the process of removing a shard from a sharded cluster.
removeShardFromZone Removes the association between a shard and a zone. Supports configuring zones in sharded clusters.
setShardVersion Internal command to sets the config server version.
shardCollection Enables the sharding functionality for a collection, allowing the collection to be sharded.
shardingState Reports whether the mongod is a member of a sharded cluster.
split Creates a new chunk.
splitVector Internal command that determines split points.
unsetSharding Internal command that affects connections between instances in a MongoDB deployment.
updateZoneKeyRange Adds or removes the association between a range of sharded data and a zone. Supports configuring zones in sharded clusters.

See also

Sharding for more information about MongoDB’s sharding functionality.

Session Commands

Commands Descriptions

Abort transaction.

New in version 4.0.


Commit transaction.

New in version 4.0.


Expire sessions before the sessions’ timeout period.

New in version 3.6.


Kill all sessions.

New in version 3.6.


Kill all sessions that match the specified pattern

New in version 3.6.


Kill specified sessions.

New in version 3.6.


Refresh idle sessions.

New in version 3.6.


Starts a new session.

New in version 3.6.

Administration Commands

Name Description
cloneCollection Copies a collection from a remote host to the current host.
cloneCollectionAsCapped Copies a non-capped collection as a new capped collection.
collMod Add options to a collection or modify a view definition.
compact Defragments a collection and rebuilds the indexes.
convertToCapped Converts a non-capped collection to a capped collection.
create Creates a collection or a view.
createIndexes Builds one or more indexes for a collection.
currentOp Returns a document that contains information on in-progress operations for the database instance.
drop Removes the specified collection from the database.
dropDatabase Removes the current database.
dropConnections Drops outgoing connections to the specified list of hosts.
dropIndexes Removes indexes from a collection.
filemd5 Returns the md5 hash for files stored using GridFS.
fsync Flushes pending writes to the storage layer and locks the database to allow backups.
fsyncUnlock Unlocks one fsync lock.
getParameter Retrieves configuration options.
killCursors Kills the specified cursors for a collection.
killOp Terminates an operation as specified by the operation ID.
listCollections Returns a list of collections in the current database.
listDatabases Returns a document that lists all databases and returns basic database statistics.
listIndexes Lists all indexes for a collection.
logRotate Rotates the MongoDB logs to prevent a single file from taking too much space.
reIndex Rebuilds all indexes on a collection.
renameCollection Changes the name of an existing collection.
setFeatureCompatibilityVersion Enables or disables features that persist data that are backwards-incompatible.
setParameter Modifies configuration options.
shutdown Shuts down the mongod or mongos process.

Diagnostic Commands

Name Description
availableQueryOptions Internal command that reports on the capabilities of the current MongoDB instance.
buildInfo Displays statistics about the MongoDB build.
collStats Reports storage utilization statics for a specified collection.
connPoolStats Reports statistics on the outgoing connections from this MongoDB instance to other MongoDB instances in the deployment.
connectionStatus Reports the authentication state for the current connection.
dataSize Returns the data size for a range of data. For internal use.
dbHash Returns hash value a database and its collections.
dbStats Reports storage utilization statistics for the specified database.
diagLogging Removed in MongoDB 3.6. To capture, replay, and profile commands sent to your MongoDB deployment, use mongoreplay.
driverOIDTest Internal command that converts an ObjectId to a string to support tests.
explain Returns information on the execution of various operations.
features Reports on features available in the current MongoDB instance.
getCmdLineOpts Returns a document with the run-time arguments to the MongoDB instance and their parsed options.
getLog Returns recent log messages.
hostInfo Returns data that reflects the underlying host system.
isSelf Internal command to support testing.
listCommands Lists all database commands provided by the current mongod instance.
lockInfo Internal command that returns information on locks that are currently being held or pending. Only available for mongod instances.
netstat Internal command that reports on intra-deployment connectivity. Only available for mongos instances.
ping Internal command that tests intra-deployment connectivity.
profile Interface for the database profiler.
serverStatus Returns a collection metrics on instance-wide resource utilization and status.
shardConnPoolStats Reports statistics on a mongos’s connection pool for client operations against shards.
top Returns raw usage statistics for each database in the mongod instance.
validate Internal command that scans for a collection’s data and indexes for correctness.
whatsmyuri Internal command that returns information on the current client.

Free Monitoring Commands

Name Description
setFreeMonitoring Enables/disables free monitoring during runtime.

Auditing Commands

Name Description
logApplicationMessage Posts a custom message to the audit log.