# Monitoring Analysis (C)

+ Grafana Monitoring TiDB —>`Query Summary - 999/99/95/80 Duration` 
  + 999 has significant performance jitter, where both Select and Insert are over 1s


![left](./student-guide/diagram/03-07-1.png)

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Through this monitoring, it is possible to clearly analyze which statement have gone wrong, whether there is a problem with a query or an insertion problem. Grafana monitors TiDB —> Query Summary —> 999/99/95/80 Duration panel to analyze whether it is a read problem or a write problem. Suddenly in 999 duration, this spike corresponds to this time period. Hover over the panel to see that both the query and the write are When there is a delay, the average delay in this period is more than 1 second, and the same as the problem is reflected, there is a problem confirming that both reads and writes are problematic. Next, we need to confirm which step went wrong.