On Ubuntu, executing the "top" command shows that mysqld constantly uses 61.9% of the memory.(when idle). I ran "show processlist" on the mysql server and it is idle. Can anyone explain what might be happening?
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Read this: http://www.chriscalender.com/?p=1278
Open my.cnf and add this at the end: performance_schema=0
Restart your services. From 620MB I have now 38MB memory used.