How to configure MySQL for performance

· Category: SQL & Databases

Short answer

Optimize MySQL performance by sizing the buffer pool, tuning connection limits, enabling query caching where appropriate, and using fast storage.

Steps

  1. Set innodb_buffer_pool_size to 70-80% of available RAM for InnoDB-dedicated servers.
  2. Tune max_connections to match your application pool size.
  3. Enable the slow query log and long_query_time to find bottlenecks.
  4. Use SSD storage and separate data, log, and temp directories if possible.
  5. Optimize table structures and indexes based on EXPLAIN output.

Tips

  • Monitor Innodb_buffer_pool_read_requests versus Innodb_buffer_pool_reads to measure cache hit ratio.
  • Use pt-query-digest from Percona Toolkit to analyze slow query logs.

Common issues

  • Setting innodb_buffer_pool_size too high causes OS swapping and severe performance degradation.
  • Table bloat from frequent updates benefits from OPTIMIZE TABLE or dump-and-reload.r