Striim 3.9.4 / 3.9.5 documentation

MongoDB setup

To use MongoDBReader, you must be running a replica set (see Deploy a Replica Set or Convert a Standalone to a Replica Set).

In InitialLoad mode, the user specified in MongoDBReader's Username property must have read access to all databases containing the specified collections. In Incremental mode, the user must have read access to the local database and the oplog.rs collection. 

To support recovery (see Recovering applications), the replica set's oplog must be large enough to retain all the events generated while Striim is offline.