How to Monitor MySQL, MariaDB or Percona, choosing the right metrics & alerts. Read more on https://blog.serverdensity.com/how-to-monitor-mysql/

1. Jorge Salamero Sanz <jsalamero@serverdensity.com>
29 October 2015

4. obviously ;-)
When
Process_count (/usr/sbin/mysqld)
!= 1
alert

5. ● Load
● CPU
● Memory
● Swap
● Network
● Read/Write requests
● IO queue length
● Average IO wait
● Average R/W time
● Read/Write bandwidth

6. Is MySQL available?
● Uptime
● Threads_connected
● Connection usage %
● Aborted_connects

7. Typical points of failure:
● Errors in mysql.log
● Are logs being rotated?
● Deleted files with FD still open?
● Enough disk space?

8. Are queries actually being run?
● Questions/s
● Queries/s
● Read/Writes
● Commands

9. The bad queries (not necessarily):
● Slow_queries
● Select_full_join
● Created_tmp_disk_tables
● Full table scans

10. Caches, buffers and locks:
● Innodb_row_lock_waits
● Innodb_buffer_pool_wait_free
● Open_tables
● Long running transactions
● Deadlocks

11. $ mysql
$ mysqladmin
$ innotop
$ mysqlreport

12. Percona Monitoring Plugins
● Nagios, Cacti, Zabbix
● can be used as CLI tools together
with Percona Toolkit