# Questions

+ I haven't launched a new business recently, why is the latency of my TiDB cluster increasing?
+ Why does my TiDB cluster suddenly become very slow with statements that were quick before?
+ Why is there a lot of slow SQL statements in my TiDB cluster at the same time?
+ I want to find a problem, but the cluster has so many Grafana monitoring metrics, how should I deal with it, and which metrics should I prioritize?

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With the in-depth use of TiDB, problems such as the following are often encountered in daily operation and administer:
- Why is the duration of my TiDB cluster increasing, and it hasn't been online recently?
- Why is my TiDB cluster, statements that were quick to execute very slowly today?
- Why is my TiDB cluster experiencing a lot of slow SQL at the same time?
- I want to find a problem, but the cluster has so many Grafana monitoring metrics, how should I deal with it and which ones should I prioritize?

Various issues related to slow read request, and so on.
So what is the reason behind these phenomena? How can we find problems through various monitoring items and log troubleshooting in TiDB? If you know the causes of specific problems, what are the ways to solve these problems?
I hope that through this course, I can help you solve such problems, make TiDB Cluster easier to operation and administer, and the front-end business is smoother and smoother.