How to use mongodump for 1 collection

How can I use mongodump to move a single collection from one database to another?

How should I use the command and its options?

I think it's just:

mongodump --db=<old_db_name> --collection=<collection_name> --out=data/

mongorestore --db=<new_db_name> --collection=<collection_name> data/<db_name>/<collection_name>.bson

Also see docs here and here.

Btw, the other way to move the collection from one database to another is to use renameCollection:

db.runCommand({renameCollection:"<old_db_name>.<collection_name>",to:"<new_db_name>.<collection_name>"})

Here's some related SO threads:

• https://stackoverflow.com/questions/11554762/how-can-i-copy-collection-to-another-database-in-mongodb
• https://stackoverflow.com/questions/5495540/how-to-use-the-dumped-data-by-mongodump

Hope that helps.

Taking database (document) dump (backup)

mongodump --host <hostname-of-mongoserver> --db <db-name> --username <dbuser-name> --password <password> --gzip --out </backup/location/>

Taking collection dump (backup)

mongodump --host <hostname-of-mongoserver> --db <db-name> --collection <collection-name> --username <dbuser-name> --password <password> --gzip --out </backup/location/>

mongodump documentation

Very basic commands for dump mongodb.

1. Dump all collection

   mongodump
   

2. Dump specific database only

   mongodump --db=DB_NAME
   

3. Dump database with username & password

   mongodump -u=USERNAME -p=PASSWORD --db=DB_NAME
   

4. Dump from another host

   mongodump --host HOST_NAME/HOST_IP --port HOST_PORT  --out {YOUR_DIRECTOTY_PATH} --db=DB_NAME
   

Only able to dump from another host when they allow it.

If it's a replica set and you want to use the --uri you should use it like this cause documentation states that you can't specify some options when using --uri

mongodump --uri "mongodb://user:[email protected]:27017,mongo-en-2.example.io:27017,mongo-en-3.example.io:27017/$Databasename?replicaSet=$replicasetname&authSource=admin"  --collection $collectionname

Then restore it the usual way.

Here is an example of how you can export a single collection with mongodump.exe on Windows 10:

"D:\Program Files\MongoDB\Server\4.0\bin\mongodump.exe" -h localhost --port 27017 -d meteor --collection users -o meteor_users

The exported collection is users, the database is meteor, the host localhost, the port is 27017.

The output will be stored in directory meteor_users.

Restoring should use a command like this one:

"D:\Program Files\MongoDB\Server\4.0\bin\mongorestore.exe" -d meteor -c users users.bson