# [[metric:blocked_sessions]]

> 存在一个或多个阻塞 PID 的会话数。
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存在一个或多个阻塞 PID 的会话数。

## 被哪些等待事件引用 {#wait-events}

- [Lock/advisory](/zh/lock/advisory/)
- [Lock/applytransaction](/zh/lock/applytransaction/)
- [Lock/extend](/zh/lock/extend/)
- [Lock/frozenid](/zh/lock/frozenid/)
- [Lock/object](/zh/lock/object/)
- [Lock/page](/zh/lock/page/)
- [Lock/relation](/zh/lock/relation/)
- [Lock/spectoken](/zh/lock/spectoken/)
- [Lock/transactionid](/zh/lock/transactionid/)
- [Lock/tuple](/zh/lock/tuple/)
- [Lock/userlock](/zh/lock/userlock/)
- [Lock/virtualxid](/zh/lock/virtualxid/)
- [LWLock/LockManager](/zh/lwlock/lock-manager/)