# [[guc:autovacuum_freeze_max_age]]

> 触发防回卷 vacuum 的事务年龄。
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触发防回卷 vacuum 的事务年龄。

[PostgreSQL 18 官方参数参考](https://www.postgresql.org/docs/18/runtime-config.html#GUC-AUTOVACUUM-FREEZE-MAX-AGE)

## 被哪些等待事件引用 {#wait-events}

- [IO/LogicalSubxactRead](/zh/io/logical-subxact-read/)
- [IO/LogicalSubxactWrite](/zh/io/logical-subxact-write/)
- [IPC/XactGroupUpdate](/zh/ipc/xact-group-update/)
- [LWLock/PerXactPredicateList](/zh/lwlock/per-xact-predicate-list/)
- [LWLock/SerializableXactHash](/zh/lwlock/serializable-xact-hash/)
- [LWLock/XactBuffer](/zh/lwlock/xact-buffer/)
- [LWLock/XactSLRU](/zh/lwlock/xact-slru/)
- [LWLock/XactTruncation](/zh/lwlock/xact-truncation/)