MongoDB Learning Notes < seven >

Continue the learning of MongoDB

1. Export data (interrupts other operations)

Export the Books collection from the database test

operate under the terminal

mongoexport-d test-c Books-o/home/hadoop/desktop/books.json

2. Import data (interrupt other operations)

Also operate under the terminal

Mongoimport--db Test--collection Books--file/home/hadoop/desktop/books.json

3. Run-time backup Mongodump

Operation under the terminal

Export the test database under 27017 of the 127.0.0.1 server

Mongodump--host 127.0.0.1:27017-d Test-o/home/hadoop/desktop/test

4. Run-time recovery Mongorestore

Operation under the terminal

Mongodump--host 127.0.0.1:27017-d Test-directoryperdb/home/hadoop/desktop/test/test

5. Lock operation

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

6. Unlocking operation

Db.currentop ()

7. Data Repair

Db.repairdatabase ()

8. Add Users

Db.adduser ("Xiaoming", "123")

9. Delete a user

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

MongoDB Learning Notes < seven >