mvcc

Multi-version concurrency control handles snapshot isolation by ensuring reads see a consistent database state at a specific point in time. It filters out uncommitted data and respects transaction boundaries using visibility rules.

The best way to manage version chains is by creating new versions for updates and tombstones for deletions without destructive in-place mutation. This maintains consistent state and preserves older record versions for concurrent reads.

Transaction visibility filters show uncommitted data when version metadata and visibility rules are incorrectly applied. Review non-destructive update patterns and ensure snapshot-based read consistency filters out uncommitted records properly.

You need multi-version concurrency control for storage engine development when implementing transaction isolation or debugging visibility issues in concurrent environments. It provides a framework for versioned records and transaction lifecycles.

You can use mvcc logic for record compaction strategies in a new storage engine. It manages transaction lifecycle state and version chain management, ensuring record compaction respects active transaction boundaries.