hmm,
looks like checkpoint ?
Check checkpoint settings in postgresql.conf.
Oleg
On Tue, 27 Mar 2007, Dmitry Koterov wrote:
Hello.
I have found that sometimes heavy loaded PostgreSQL begins to run all the
queries slower than usual, sometimes - 5 and more times slower. I cannot
reprocude that, but symptoms are the following: queries work very fast for
5-10 minutes, and after that - significant slowdown (every query, even a
simple one, works 5-10 and ever more times slower), disk write activity
grows too (but not everytime - I don't know exactli if there is a direct
correlation). 2-3 seconds, then - performance restores back to normal.
Autovacuum is turned off.
Machine has 2 processors, huge memory, fast SCSI disks.
I understand that there is too less information. Please advice what to
monitor for better problem discovering.
Regards,
Oleg
_____________________________________________________________
Oleg Bartunov, Research Scientist, Head of AstroNet (www.astronet.ru),
Sternberg Astronomical Institute, Moscow University, Russia
Internet: oleg@xxxxxxxxxx, http://www.sai.msu.su/~megera/
phone: +007(495)939-16-83, +007(495)939-23-83
