MongoDB system Knowledge (11)

1. Lock unlock

Db.runcommand ({fsync:1,lock:1})

Unlock

Db.currentop ()

2. Data Repair

Db.repairdatabase ()

3. Db.createuser ({User: "Uspcat", pwd: "123", Roles:[{role: "Useradminanydatabase", DB: "Admin"}]})

 built-in Roles (built-in role):  1  .    Database user role: Read, readWrite;     2  . Database Management roles: DbAdmin, Dbowner, useradmin;  3  . Cluster Management role: Clusteradmin, Clustermanager, Clustermonitor, Hostmanager;  4   5   6  . Super User role: root  //  There are also several roles that indirectly or directly provide access to System Superuser (Dbowner, Useradmin, useradminanydatabase)  7 . Internal role: __system 

READ: Allows the user to read the specified database ReadWrite: Allows the user to read and write to the specified database dbadmin: Allows the user to execute administrative functions in the specified database, such as index creation, deletion, View statistics or Access System.profileuseradmin: Allows the user to write to the System.users collection and can create, delete, and manage user clusteradmin in the specified database: Only available in the admin database. Gives the user administrative privileges on all shards and replica set related functions. Readanydatabase: Only available in the Admin database, giving the user read access to all databases Readwriteanydatabase: Only available in the admin database, Give users read and write access to all databases Useradminanydatabase: Available only in the admin database, giving the user useradmin permissions to all databases Dbadminanydatabase: Only available in the admin database, Gives the user dbadmin permissions for all databases. Root: Available only in the admin database. Super account, Super privilege

4. Start the user

Db.auth ("Uspcat", "123") \

5. Delete a user

Db.system.users.remove ({User: "Uspcat"})

MongoDB system Knowledge (11)