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Db.getReplicationInfo()

As explained in MongoDB 8.0 in Action, Third Edition

db.getReplicationInfo() is a MongoDB database method that returns replication-status information derived from oplog data.

db.getReplicationInfo() returns a JSON document that summarizes MongoDB replica-set replication status from oplog data. Use it to inspect oplog capacity, usage, coverage window, and timestamps when diagnosing replication problems. The method works only on M10 clusters and larger. section 9.1.3

Read the returned fields as operational signals:

  • Use timeDiff and timeDiffHours to determine the time span between the earliest and latest oplog entries. section 9.1.3

Inspect replication information

Run db.getReplicationInfo(). A sample response reports a 4096 MB configured and actual oplog, 4074.63 MB used, and a 176.43-hour time window. Because the output is JSON, it can support script-based automation. section 9.1.3

How MongoDB 8.0 in Action, Third Edition covers it

How deep it goes
Explains returned fields and their operational meaning, but stops short of detailing the method’s implementation.
Examples
Uses a command output showing a 4096 MB oplog, 4074.63 MB used, and a 176.43-hour oplog window.
What it assumes
Requires a MongoDB deployment with a replica set and an M10-or-larger cluster for method availability.
What you can do after
Diagnose replication conditions and automate status checks using the method’s JSON output.
How it connects
Connects replica sets, oplog, replication lag, and chained replication.
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