Shulou(Shulou.com)06/01 Report--

Mongodb provides two commands to back up (mongodump) and restore (mongorestore) data. The format of the data dump is BSON.

1.mongodump backup

Usage: bin/mongodump [options]

For example: back up the database of port 6666 to the / data/6666 directory on this machine

Bin/mongodump-- port 6666-- directoryperdb-o / data/6666

Connected to: 127.0.0.1:6666

All dbs

DATABASE: test to / data/6666/test

Test.system.indexes to / data/6666/test/system.indexes.bson

1 objects

Test.ints to / data/6666/test/ints.bson

4 objects

DATABASE: admin to / data/6666/admin

2.mongorestore recovery

Usage: bin/mongorestore [options] [directory or filename to restore from]

For example: delete the database test and then restore it from the backup directory

> show dbs

Admin (empty)

Local 4.201171875GB

Test 0.203125GB

> use test

Switched to db test

> db.dropDatabase ()

{"dropped": "test", "ok": 1}

> show dbs

Admin (empty)

Local 4.201171875GB

Restore using mongorestore

Bin/mongorestore-host 127.0.0.1 directoryperdb / data/6666/

Connected to: 127.0.0.1:6666

Wed Jul 6 16:37:33 / data/6666/test/ints.bson

Wed Jul 6 16:37:33 going into namespace [test.ints]

Wed Jul 6 16:37:33 4 objects found

Wed Jul 6 16:37:33 / data/6666/test/system.indexes.bson

Wed Jul 6 16:37:33 going into namespace [test.system.indexes]

Wed Jul 6 16:37:33 {name: "_ id_", ns: "test.ints", key: {_ id: 1}, v: 0}

Wed Jul 6 16:37:33 1 objects found

Check to see if the database is restored

> show dbs

Admin (empty)

Local 4.201171875GB

Test 0.203125GB

Mongorestore has a parameter-drop. Using this parameter, all the data in the collection will be deleted and then restored.

That is, if you have new data after backing up the data, then use-- drop, and the new data will not be seen.

Without this parameter, the new data still exists when the backup is restored.

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