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Firebird's multi-generational architecture means one forgotten open transaction can stall garbage collection and bloat the database file. Here's how to detect it with gstat and MON$ tables, and how to fix it.
CouchDB’s MVCC keeps every write as a leaf revision, so concurrent updates create conflicts that the application must resolve. Learn how to detect, merge, and clean up these conflicts to avoid storage bloat and data divergence.
Learn how to implement and monitor bidirectional data synchronization in CouchDB using the _replicator database to build resilient, offline-first applications.
Learn how to diagnose and fix disk exhaustion in CouchDB caused by MVCC revision bloat using the _compact endpoint and automatic compaction settings.
Learn how CouchDB uses Multiversion Concurrency Control (MVCC) to handle concurrent updates without locking, and how to resolve revision conflicts in your application.
When a write operation fails inside Realm.executeTransaction(), the transaction is rolled back and the method returns false, allowing the caller to retry the same intent. Because Realm uses MVCC, readers see a consistent snapshot and committed changes are invisible until the transaction succeeds. The goal is to confirm that a retry does not create duplicate
In PostgreSQL, the REPEATABLE READ isolation level utilizes Multiversion Concurrency Control (MVCC) to provide a consistent snapshot as of the start of the first query. While this implementation effectively prevents phantom reads—exceeding the standard SQL requirement—it introduces specific constraints regarding concurrent data modification. When a transacti
firebird
couchdb
realm
postgresql