What are the best practices for optimizing MySQL query performance when using Percona Server, and how can I effectively monitor slow queries?
Hello @sajjad1122,
Learn to use EXPLAIN for your queries. Example: EXPLAIN SELECT cola, colb FROM mytable WHERE colb = 45
This will tell you how the optimizer will execute the query, which indexes might be usable, which index was chosen, and other things.
If the type is ALL, that’s a full-table-scan, no indexes used, bad for performance.
Install and setup Percona Monitoring and Management (PMM).
PMM will collect query metrics for you, and present an easy-to-use web UI. From here, you can see historical query metrics, and run EXPLAIN to identify queries not using indexes.