The JusDB Database Engineering Blog
Deep dives on PostgreSQL, MySQL, MongoDB and more — performance tuning, high availability, migrations and production war stories from our DBAs.
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MongoDB Change Streams in Production: Resume Tokens and the Oplog Window
Run MongoDB change streams in production: store resume tokens durably, size the oplog window, recover from ChangeStreamHistoryLost, and choose updateLookup or pre-images.
MongoDB19 minOct 25, 2026
ReadMongoDB Oplog Sizing and the Replication Window
Measure your MongoDB oplog window and write churn, find what fills the oplog, size it with a worked example, and resize it safely on every member or on Atlas.
MongoDB17 minOct 25, 2026
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