What should be monitored on a busy Database/MysQL server?

On a busy MySQL server, some key metrics that should be actively monitored include:

  • CPU and memory usage
  • Disk I/O activity and available storage space
  • Network traffic
  • Query performance and slow query logs
  • Number of active connections
  • InnoDB buffer pool usage
  • Replication status (if replication is configured)
  • Error logs
  • Table and index fragmentation
  • Key buffer usage
  • Thread and process numbers

Additionally, it's also important to monitor the MySQL's process list to see what queries are currently running and identify any possible issues with locking or blocking.

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