PostgreSQL Enterprise & Performance
10+ Years (Principal / Architect)
Expert
Production Scenario
How do you prevent Transaction ID Wraparound (XID Wraparound) and catastrophic database shutdowns in PostgreSQL?
Real-World Scenario / Incident Description
PostgreSQL logs issued urgent warnings: `WARNING: database "prod_db" must be vacuumed within 10000000 transactions`.
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Updated 1 month ago
Transaction ID Wraparound Disaster Prevention
PostgreSQL uses 32-bit transaction IDs (max ~4 billion). When transaction counters exceed 2 billion, past transactions appear in the "future", causing data invisibility.
- Autovacuum Freeze: Automatically converts old transaction IDs to
FrozenTransactionId. - Immediate Action:
Ensure long-running idle transactions and abandoned replication slots do not block autovacuum progress.VACUUM FREEZE ANALYZE;
Related Concepts:
#XID Wraparound
#VACUUM FREEZE
#PostgreSQL Internals
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