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, use the db.runCommand():

db.runCommand( { <command> } )

User Commands

Aggregation Commands

Name Description
aggregate Performs aggregation tasks such as group using the aggregation framework.
count Counts the number of documents in a collection.
distinct Displays the distinct values found for a specified key in a collection.
group Groups documents in a collection by the specified key and performs simple aggregation.
mapReduce Performs map-reduce aggregation for large data sets.

Geospatial Commands

Name Description
geoNear Performs a geospatial query that returns the documents closest to a given point.
geoSearch Performs a geospatial query that uses MongoDB’s haystack index functionality.

Query and Write Operation Commands

Name Description
find Selects documents in a collection.
insert Inserts one or more documents.
update Updates one or more documents.
delete Deletes one or more documents.
findAndModify Returns and modifies a single document.
getMore Returns batches of documents currently pointed to by the cursor.
getLastError Returns the success status of the last operation.
getPrevError Returns status document containing all errors since the last resetError command.
resetError Resets the last error status.
eval Deprecated. Runs a JavaScript function on the database server.
parallelCollectionScan Lets applications use multiple parallel cursors when reading documents from a collection.

Query Plan Cache Commands

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

Database Operations

Authentication Commands

Name Description
logout Terminates the current authenticated session.
authenticate Starts an authenticated session using a username and password.
copydbgetnonce This is an internal command to generate a one-time password for use with the copydb command.
getnonce This is an internal command to generate a one-time password for authentication.
authSchemaUpgrade Supports the upgrade process for user data between version 2.4 and 2.6.

User Management Commands

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

Role Management Commands

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

Replication Commands

Name Description
replSetFreeze Prevents the current member from seeking election as primary for a period of time.
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.
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.
resync Forces a mongod to re-synchronize from the master. For master-slave replication only.
applyOps Internal command that applies oplog entries to the current data set.
isMaster Displays information about this member’s role in the replica set, including whether it is the master.
replSetGetConfig Returns the replica set’s configuration object.

See also

Replication for more information regarding replication.

Sharding Commands

Name Description
flushRouterConfig Forces an update to the cluster metadata cached by a mongos.
addShard Adds a shard to a sharded cluster.
cleanupOrphaned Removes orphaned data with shard key values outside of the ranges of the chunks owned by a shard.
checkShardingIndex Internal command that validates index on shard key.
enableSharding Enables sharding on a specific database.
listShards Returns a list of configured shards.
removeShard Starts the process of removing a shard from a sharded cluster.
getShardMap Internal command that reports on the state of a sharded cluster.
getShardVersion Internal command that returns the config server version.
mergeChunks Provides the ability to combine chunks on a single shard.
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.
unsetSharding Internal command that affects connections between instances in a MongoDB deployment.
split Creates a new chunk.
splitChunk Internal command to split chunk. Instead use the methods sh.splitFind() and sh.splitAt().
splitVector Internal command that determines split points.
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.
isdbgrid Verifies that a process is a mongos.

See also

Sharding for more information about MongoDB’s sharding functionality.

Instance Administration Commands

Name Description
renameCollection Changes the name of an existing collection.
copydb Copies a database from a remote host to the current host.
dropDatabase Removes the current database.
listCollections Returns a list of collections in the current database.
drop Removes the specified collection from the database.
create Creates a collection and sets collection parameters.
clone Copies a database from a remote host to the current host.
cloneCollection Copies a collection from a remote host to the current host.
cloneCollectionAsCapped Copies a non-capped collection as a new capped collection.
convertToCapped Converts a non-capped collection to a capped collection.
filemd5 Returns the md5 hash for files stored using GridFS.
createIndexes Builds one or more indexes for a collection.
listIndexes Lists all indexes for a collection.
dropIndexes Removes indexes from a collection.
fsync Flushes pending writes to the storage layer and locks the database to allow backups.
clean Internal namespace administration command.
connPoolSync Internal command to flush connection pool.
connectionStatus Reports the authentication state for the current connection.
compact Defragments a collection and rebuilds the indexes.
collMod Add flags to collection to modify the behavior of MongoDB.
reIndex Rebuilds all indexes on a collection.
setParameter Modifies configuration options.
getParameter Retrieves configuration options.
repairDatabase Repairs any errors and inconsistencies with the data storage.
repairCursor Returns a cursor that iterates over all valid documents in a collection.
touch Loads documents and indexes from data storage to memory.
shutdown Shuts down the mongod or mongos process.
logRotate Rotates the MongoDB logs to prevent a single file from taking too much space.

Diagnostic Commands

Name Description
explain Returns information on the execution of various operations.
listDatabases Returns a document that lists all databases and returns basic database statistics.
dbHash Returns hash value a database and its collections.
driverOIDTest Internal command that converts an ObjectId to a string to support tests.
listCommands Lists all database commands provided by the current mongod instance.
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.
shardConnPoolStats Reports statistics on a mongos‘s connection pool for client operations against shards.
dbStats Reports storage utilization statistics for the specified database.
cursorInfo Removed in MongoDB 3.2. Replaced with metrics.cursor.
dataSize Returns the data size for a range of data. For internal use.
diagLogging Provides a diagnostic logging. For internal use.
getCmdLineOpts Returns a document with the run-time arguments to the MongoDB instance and their parsed options.
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.
validate Internal command that scans for a collection’s data and indexes for correctness.
top Returns raw usage statistics for each database in the mongod instance.
whatsmyuri Internal command that returns information on the current client.
getLog Returns recent log messages.
hostInfo Returns data that reflects the underlying host system.
serverStatus Returns a collection metrics on instance-wide resource utilization and status.
features Reports on features available in the current MongoDB instance.
isSelf Internal command to support testing.

Internal Commands

Name Description
handshake Internal command.
_recvChunkAbort Internal command that supports chunk migrations in sharded clusters. Do not call directly.
_recvChunkCommit Internal command that supports chunk migrations in sharded clusters. Do not call directly.
_recvChunkStart Internal command that facilitates chunk migrations in sharded clusters.. Do not call directly.
_recvChunkStatus Internal command that returns data to support chunk migrations in sharded clusters. Do not call directly.
_replSetFresh Internal command that supports replica set election operations.
mapreduce.shardedfinish Internal command that supports map-reduce in sharded cluster environments.
_transferMods Internal command that supports chunk migrations. Do not call directly.
replSetHeartbeat Internal command that supports replica set operations.
replSetGetRBID Internal command that supports replica set operations.
_migrateClone Internal command that supports chunk migration. Do not call directly.
replSetElect Internal command that supports replica set functionality.
writeBacksQueued Internal command that supports chunk migrations in sharded clusters.
writebacklisten Internal command that supports chunk migrations in sharded clusters.

Testing Commands

Name Description
testDistLockWithSkew Internal command. Do not call this directly.
testDistLockWithSyncCluster Internal command. Do not call this directly.
captrunc Internal command. Truncates capped collections.
emptycapped Internal command. Removes all documents from a capped collection.
godinsert Internal command for testing.
_hashBSONElement Internal command. Computes the MD5 hash of a BSON element.
journalLatencyTest Tests the time required to write and perform a file system sync for a file in the journal directory.
sleep Internal command for testing. Forces MongoDB to block all operations.
replSetTest Internal command for testing replica set functionality.
forceerror Internal command for testing. Forces a user assertion exception.
skewClockCommand Internal command. Do not call this command directly.
configureFailPoint Internal command for testing. Configures failure points.

Auditing Commands

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

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