Use when a query is slow and you need to diagnose, enabling the slow query log, analyzing aggregated samples with mariadb-dumpslow or pt-query-digest, profiling via performance_schema, detecting missing indexes from EXPLAIN, or interpreting Using filesort and Using temporary signals. Prevents the co
Use when a query is slow and you need to diagnose, enabling the slow query log, analyzing aggregated samples with mariadb-dumpslow or pt-query-digest, profiling via performance_schema, detecting missing indexes from EXPLAIN, or interpreting Using filesort and Using temporary signals. Prevents the common mistake of trusting random one-off timings, leaving the slow query log disabled in production,