MongoDB backup and recovery
May 17, 2021 MongoDB
Table of contents
MongoDB Backup (mongodump) and Recovery (mongorerstore)
MongoDB data backup
In Mongodb we use the Mongodump command to back up MongoDB data. The command can export all data to the specified directory.
The mongodump command can specify the server for the transfer of the exported data magnitude by parameters.
Grammar
The mongodump command script syntax is as follows:
>mongodump -h dbhost -d dbname -o dbdirectory
-
-h：
MongDB's server address, e.g. 127.0.0.1, can also specify port number: 127.0.0.1:27017
-
-d：
A database instance that needs to be backed up, for example: test
-
-o：
The location of the backed up data, for example: c:\data\dump, of course, the directory needs to be established in advance, after the backup is complete, the system automatically establishes a test directory in the dump directory, which holds the backup data of the database instance.
Instance
Start your mongod service locally with 27017. Open the command prompt window and enter the command mongodump into the bin directory of the MongoDB installation directory:
>mongodump
After executing the above command, the client connects to the MongoDB service with ip port number 127.0.0.1 27017 and backs up all data to the bin/dump/directory. T he command output is as follows:
The list of optional parameters for the mongodump command looks like this:
| Grammar | Describe | Instance |
|---|---|---|
| mongodump --host HOST_NAME --port PORT_NUMBER | The command backs up all MongoDB data | mongodump --host w3cschool.cn --port 27017 |
| mongodump --dbpath DB_PATH --out BACKUP_DIRECTORY | mongodump --dbpath /data/db/ --out /data/backup/ | |
| mongodump --collection COLLECTION --db DB_NAME | The command backs up the collection of the specified database. | mongodump --collection mycol --db test |
MongoDB data recovery
Mongodb uses the mongorerstore command to recover the backed up data.
Grammar
The mongorestore command script syntax is as follows:
>mongorestore -h dbhost -d dbname --directoryperdb dbdirectory
-
-h：
The server address where MongoDB is located
-
-d：
A database instance that needs to be recovered, such as test, which can of course be a different name than it was at the time of the backup, such as test2
-
--directoryperdb：
Where the backup data is located, e.g.: c:-data-dump-test, why add one more test here instead of the dump at the time of the backup, and the reader will check the tips themselves!
-
--drop：
When you recover, delete the current data and then restore the backed up data. That is to say, after recovery, after the backup to add modified data will be deleted, use with caution Oh!
Let's then execute the following command:
>mongorestore
The output of the above commands is as follows:
