mongo操作指令

db.help() help on db methods

db.mycoll.help() help on collection methods

sh.help() sharding helpers

rs.help() replica set helpers

help admin administrative help

help connect connecting to a db help

help keys key shortcuts

help misc misc things to know

help mr mapreduce

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show dbs show database names

show collections show collections in current database

show users show users in current database

show profile show most recent system.profile entries with time >= 1ms

show logs show the accessible logger names

show log [name] prints out the last segment of log in memory, ‘global’ is default

use <db_name> set current database

db.foo.find() list objects in collection foo

db.foo.find( { a : 1 } ) list objects in foo where a == 1

it result of the last line evaluated; use to further iterate

DBQuery.shellBatchSize = x set default number of items to display on shell

exit quit the mongo shell

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DB methods:

db.adminCommand(nameOrDocument) - switches to ‘admin’ db, and runs command [ just calls db.runCommand(…) ]

db.auth(username, password)

db.cloneDatabase(fromhost)

db.commandHelp(name) returns the help for the command

db.copyDatabase(fromdb, todb, fromhost)

db.createCollection(name, { size : …, capped : …, max : … } )

db.createUser(userDocument)

db.currentOp() displays currently executing operations in the db

db.dropDatabase()

db.eval() - deprecated

db.fsyncLock() flush data to disk and lock server for backups

db.fsyncUnlock() unlocks server following a db.fsyncLock()

db.getCollection(cname) same as db[‘cname’] or db.cname

db.getCollectionInfos()

db.getCollectionNames()

db.getLastError() - just returns the err msg string

db.getLastErrorObj() - return full status object

db.getLogComponents()

db.getMongo() get the server connection object

db.getMongo().setSlaveOk() allow queries on a replication slave server

db.getName()

db.getPrevError()

db.getProfilingLevel() - deprecated

db.getProfilingStatus() - returns if profiling is on and slow threshold

db.getReplicationInfo()

db.getSiblingDB(name) get the db at the same server as this one

db.getWriteConcern() - returns the write concern used for any operations on this db, inherited from server object if set

db.hostInfo() get details about the server’s host

db.isMaster() check replica primary status

db.killOp(opid) kills the current operation in the db

db.listCommands() lists all the db commands

db.loadServerScripts() loads all the scripts in db.system.js

db.logout()

db.printCollectionStats()

db.printReplicationInfo()

db.printShardingStatus()

db.printSlaveReplicationInfo()

db.dropUser(username)

db.repairDatabase()

db.resetError()

db.runCommand(cmdObj) run a database command. if cmdObj is a string, turns it into { cmdObj : 1 }

db.serverStatus()

db.setLogLevel(level,)

db.setProfilingLevel(level,) 0=off 1=slow 2=all

db.setWriteConcern( ) - sets the write concern for writes to the db

db.unsetWriteConcern( ) - unsets the write concern for writes to the db

db.setVerboseShell(flag) display extra information in shell output

db.shutdownServer()

db.stats()

db.version() current version of the server