I want to replicated a single database of a mongoDB-Server. There are four databases on the server:
| Server A | to replicated | Server B |
|---|---|---|
| database 1a | database 1b | |
| database 2a | database 2b | |
| database 3a | ————–> | database 3b |
| database 4a | database 4b |
Only the database 3a should be replicated to Server B.
How can I do it? Is it possible with the normal replication configuration (https://www.mongodb.com/docs/manual/replication/) and if the answer is yes, how?
I hope you can help. Thank you in forward.
2
Answers
Short answer: this is not possible with Replication.
Long answer: Perhaps is would be possible with some crazy setup of a Sharded Cluster, because sharding is enabled/disabled per database.
Yes, it’s possible… Change streaming is the solution. So, you copy changes of one database (or collection) to other server.