# 写写冲突

+ TiDB --> Query Summary --> Failed Query OPM
![center](./student-guide/diagram/place-holder.png)
+ TiDB -->  KV Errors --> KV Backoff OPS
![center](./student-guide/diagram/place-holder.png)


------------------------------------------------------------
    - TiDB --> Query Summary --> Failed Query OPM
通过下述监控项来确认，集群中是否出现了大量的 9007 （写冲突）报错

    - TiDB -->  KV Errors --> KV Backoff OPS
通过该监控来查看 TiKV 中返回错误信息的数量，txnlock 表示集群中存在写写冲突