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51 Best MongoDB Help Methods And Use [How To]

In this post, I am sharing MongoDb’s “Help methods” and the details on specific methods including syntax and also for examples to go to below reference links.

Stayed Informed - Apache Cassandra vs. Mongodb

1.      adminCommand(nameOrDocument) – It is used to switches to “admin” db and runs command.
2.      auth(username, password)
3.      cloneDatabase(fromhost)
4.      commandHelp(name) – It is returns the help for the command.
5.      copyDatabase(fromdb, todb, fromhost)
6.      createCollection(name, { size : ..., capped : ..., max : ... } )
7.      createView(name, viewOn, [ { $operator: {...}}, ... ], { viewOptions } )
8.      createUser(userDocument) – Used to create the users.
9.      currentOp() – It is used to displays currently executing operations in the db.
10. dropDatabase() – It’s used to drop db.
11. eval() – It is used to deprecated.
12. fsyncLock() – It’s used to flush data to disk and lock server for backups.
13. fsyncUnlock() – It’s used to unlocks server following a db.fsyncLock().
14. getCollection(cname) – It’s used to same as db['cname'] or db.cname
15. getCollectionInfos([filter]) – It is returns a list that contains the names and options of the dbs collections.
16. getCollectionNames() – It used to get the collections name.
17. getLastError() – It is returns the error message string.
18. getLastErrorObj() – It is return full status object.
19. getLogComponents()  - It is used to get log.
20. getMongo() – It used to get the server connection object.
21. getMongo().setSlaveOk()  - It used to allow queries on a replication slave server.
22. getName() – It is used to get the name.
23. getPrevError() -   It is used to get the previous error.
24. getProfilingLevel() – It is used to profile deprecated.
25. getProfilingStatus() – It is returns, if profiling is on and slow threshold.
26. getReplicationInfo() – It is used to display the replication Information.
27. getSiblingDB(name)  - It used to get the db at the same server as this one.
28. getWriteConcern() – It is returns the write concern used for any operations on this db, inherited from server object if set.
29. hostInfo()  - It is used to get details about the servers host.
30. isMaster() – It use to check the replica primary status.
31. killOp(opid) -  It use to kills the current operation in the db.
32. listCommands() – It use to lists all the db commands.
33. loadServerScripts() – It is loads all the scripts in db.system.js.
34. logout() – It is used to logout.
35. printCollectionStats() – It is used to print the collections status.
36. printReplicationInfo() – It is used to print the replication information.
37. printShardingStatus() - It is used to print the sharding status.
38. printSlaveReplicationInfo()
39. dropUser(username) -  It is used to drop the existing users.
40. repairDatabase() – It  is used to repair the database.
41. resetError() – It is used to reset the error msg.
42. runCommand(cmdObj) – It use to run a database command.  if cmdObj is a string, turns it into { cmdObj : 1 }.
43. serverStatus() – It used to display the server status.
44. setLogLevel(level,<component>)
45. setProfilingLevel(level,<slowms>) 0=off 1=slow 2=all
46. setWriteConcern( <write concern doc> ) – It use to sets the write concern for writes to the db.
47. unsetWriteConcern( <write concern doc> ) – It use to unsets the write concern for writes to the db.
48. setVerboseShell(flag) – It used to display extra information in shell output.
49. shutdownServer() – It used to shout down the server.
50. stats() – It is used to display the stats.
51. version() – It is used to display the current version of the server.


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By Anil Singh | Rating of this article (*****)

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