after check out the wiki page Maciek mentioned, turns out that heavy connection also burden the disk hardly. looks like I am in the vicious circle: 1, slow query cause connection blocked so the client request more connection. 2, more connection cause high disk io and make even the simplest query slow and block.
I guess I should optimized those queries first... On Thu, Jul 12, 2012 at 10:20 AM, Craig Ringer <ring...@ringerc.id.au>wrote: > On 07/12/2012 08:47 AM, Yan Chunlu wrote: > > Really sorry for the lack of information > > I shouldn't have grumped like that either, sorry about that. > > > I didn't mention the connections number because I don't think my app is > that busy, and the large number connections was caused by slow queries. > > > Yep - assumptions are a killer like that. > > Now you know to watch your system load with iostat, vmstat, top, etc and > to monitor your overall load. > > -- > Craig Ringer >
