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- Database Commands
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.
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. |
geoWalk | An internal command to support geospatial queries. |
Query and Write Operation Commands¶
Name | Description |
---|---|
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. |
text | Performs a text search. |
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 | 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. |
getoptime | Internal command to support replication, returns the optime. |
参见
复制 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. |
参见
分片 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. |
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. |
closeAllDatabases | Internal command that invalidates all cursors and closes open database files. |
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. |
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. |
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. |
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 |
---|---|
listDatabases | Returns a document that lists all databases and returns basic database statistics. |
dbHash | Internal command to support sharding. |
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 | Deprecated. Reports statistics on active cursors. |
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. |
indexStats | Experimental command that collects and aggregates statistics on all indexes. |
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. |