How frequently primary mongodb replicate data to secondary?

Question

I have three mongodb machine (1 primary and 2 secondary) with replication. I know primary mongodb doing asynchronous write to secondary but how frequently ?

I read, it use oplog to write secondary but opslog minimum size will be in MB so what will happen if primary goes down before oplog size. ?

Is there any link for documentation where i can read mongodb internal process. ?

Answer 1

You can refer to these two sources:

1. MongoDB Replication Lag
2. MongoDB Ops Manager