Re: [PERFORM] Performance issues with postgresql-8.4.0

2010-07-04 Thread Craig Ringer
On 29/06/10 15:01, Sachin Kumar wrote: > At times we have observed that postgres stops responding for several > minutes, even couldn't fetch the number of entries in a particular > table. Quick guess: checkpoints. Enable checkpoint logging, follow the logs, see if there's any correspondance. In

Re: [PERFORM] Extremely high CPU usage when building tables

2010-07-04 Thread Deborah Fuentes
We did see a small spike in disk I/O, but only had wait I/O for less than 10 seconds total. The low CPU idle event goes on for several minutes, wait I/O or heavier I/O does not correlate to the extended period. System time does jump up at the same time as the user time. System times of 15% when

[PERFORM] Performance issues with postgresql-8.4.0

2010-07-04 Thread Sachin Kumar
Hi, We are using postgresql-8.4.0 on 64-bit Linux machine (open-SUSE 11.x). It's a master/slave deployment & slony-2.0.4.rc2 is used for DB replication on the slave box. At times we have observed that postgres stops responding for several minutes, even couldn't fetch the number of entries i