mytop is an interesting and useful little utility program for monitoring your MySQL server.
In concept it is very similar to Unix's top command, which shows you the top processes (in terms of CPU usage) on your Unix system.
Here's a sample of program output from just a moment ago:
As you may be able to tell, mytop is getting this data from the MySQL SHOW PROCESSLIST and SHOW STATUS commands. mytop refreshes this data automatically and presents it in a more usable format.
MySQL on mercury (5.1.32-log) up 1+17:31:48 [20:29:26]
Queries: 15.0 qps: 0 Slow: 0.0 Se/In/Up/De(%): 45761547/00/00/00
qps now: 1 Slow qps: 0.0 Threads: 7 ( 4/ 1) 2875/00/00/00
Key Efficiency: 100.0% Bps in/out: 0.0/ 0.2 Now in/out: 16.8/ 1.5k
Master: mysqlLOGb.000007/158175944 do: ign:
Id User Host/IP DB Time Cmd Query or State
-- ---- ------- -- ---- --- ----------
798824 root jupiter netbuilder 0 Query show full processlist
798893 root jupiter netbuilder 0 Query DELETE FROM blab_online WHERE usr_id=1 OR (1240194566-rtime)>12
798894 root jupiter tech-faq-p 0 Query SELECT proxy FROM pl_proxy WHERE id = 33976
798852 root jupiter netbuilder 1 Query select cache from carpautocache where id="9f4ad1ed051de475f72e2aa7b64e1ec6"
798890 root jupiter tech-faq-p 1 Sleep
798864 root jupiter howtodothe 6 Sleep
798851 root jupiter netbuilder 9 Sleep
None of this is exactly easy to read, but if you're troubleshooting a nasty MySQL performance issue you'll take the time to work through it.