How do you rename a MongoDB database?

In MongoDB, directly renaming an entire database is not natively supported. However, it can be achieved by copying or migrating collections to a new database. I will introduce a common approach to accomplish this goal:

Method: Using mongodump and mongorestore

This method involves exporting the data from the current database and then importing it into a new database. Here are the specific steps:

1. Export the Database: Use the mongodump tool to export the database you want to rename. Assume the original database name is old_db.

   bash
   mongodump --db old_db --out /path/to/dump

   This command exports the old_db database to the specified path.

2. Import into the New Database: Use the mongorestore tool to import the exported data into the new database. Assume the new database name is new_db.

   bash
   mongorestore --nsFrom "old_db.*" --nsTo "new_db.*" /path/to/dump/old_db

   This command imports all collections exported from old_db into the new_db database.

3. Verification and Cleanup: Connect to MongoDB, verify that the new database new_db contains all required data, and confirm data integrity. If everything is successful, you can proceed to delete the old database.

   bash
   mongo
   > use old_db
   > db.dropDatabase()

The primary advantage of this method is its simplicity and the ability to migrate data without service interruption. However, note that large-scale data migration may require significant time and sufficient disk space to store the exported data.

Use Case Example

Consider an e-commerce platform changing from the old brand name old_brand to new_brand, where the database must be renamed to reflect this update. Using the above method efficiently completes this task, minimizing business disruption while ensuring data consistency and integrity.

In summary, although MongoDB does not natively support direct database renaming, appropriate data migration strategies effectively address this requirement.