Operations Log (MongoDB İşlem Günlüğü)

The capped system collection in a replica set recording an idempotent log of all write operations replayed across secondary nodes.

Internal Architecture Breakdown

The operations log (local.oplog.rs) stores an append-only stream of write statements transformed into idempotent mutations. Because it operates as a capped collection, older entries roll off when size limits are reached.

If a secondary's replication lag exceeds the primary's oplog window duration, replication breaks permanently, forcing an expensive Initial Sync. Oplog capacity should comfortably buffer 24 to 48 hours of write spikes.

Production Inspection Queries

MongoDB

rs.printReplicationInfo();
// Detaylı inceleme:
db.getReplicationInfo();

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