问题
Site is an ecommerce site: 5 Million records in table Two servers: one for webserver and other contains mysql Search is happenning through Sphinx server. So search queries do not come to MySQL
Mysql configuration: Dual Quad Core Zeoo 2.0, 146 GB, 16 GB RAM. Webserver configuration: Dual Quad Core Zeoo 2.0, 146 GB, 16 GB RAM.
For past four days I find MySQL is using CPU continuously for at least 6-7 hours in a day. It becomes normal after that. Even if I restart, it doesnt stop. It again uses CPU in 2 to 3 mins. I even tried stopping Apache and made sure no one is connecting to Mysql.
回答1:
I just noticed the same issue on my server and tried to do something about it. I upgraded mysql and all it did was reduce the amount of CPU used - from 100% to 55%
I think my issue is Leap Second related - I notice your question is 15 days after the lead second.
I found: EC2 Amazon Linux AMI MySQL CPU @ 62% When Idle?
Which lead me to: Why Does the Leap Second Cause Problems?
Lastly I did the classic windows fix and rebooted the linux box - this worked (did not check if kernel had been upgraded in mean time)
来源：https://stackoverflow.com/questions/6710563/mysql-suddenly-uses-cpu-even-when-no-one-user-is-connected-to-mysql