Re: [GENERAL] Postgres's Performance degrades after heavy db operation
In response to "Preeti Khurana" : > I checked the release notes till 8.1.17, but could not come across any such > issue which leads to db performance degradation after doing heavy db > operations. I don't think that was his point. I expect it was something more along the lines of crashing bugs and data corruption bugs that you might want to have fixed. > AutoVacuum is also enabled parallel. Which means virtually nothing if we're trying to help you tune. What are your autovacuum settings? Simply turning it on is not always enough (if it were, there wouldn't be a need to have other settings, now would there) And I'll reiterate something that was said on this thread earlier ... it's likely that autovacuum isn't going to be enough for your usage pattern. Have you posted the output of VACUUM VERBOSE yet? -- Bill Moran http://www.potentialtech.com http://people.collaborativefusion.com/~wmoran/ -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
Re: [GENERAL] Postgres's Performance degrades after heavy db operation
2009/6/10 Preeti Khurana : > I checked the release notes till 8.1.17, but could not come across any such > issue which leads to db performance degradation after doing heavy db > operations. AutoVacuum is also enabled parallel. Note that you might be much better served moving to 8.3 if HOT can help with your usage patterns. A database I work with dropped in load by about 1/2 (maybe a bit more) just by switching to 8.3. But it's not magic pixie dust and if your usage patterns preclude HOT helping (i.e. updating every row in a table) then I don't expect any miracles. -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
Re: [GENERAL] Postgres's Performance degrades after heavy db operation
I checked the release notes till 8.1.17, but could not come across any such issue which leads to db performance degradation after doing heavy db operations. AutoVacuum is also enabled parallel. -Original Message- From: Grzegorz Jaśkiewicz [mailto:gryz...@gmail.com] Sent: Monday, June 08, 2009 9:59 PM To: Preeti Khura Cc: pgsql-general@postgresql.org Subject: Re: [GENERAL] Postgres's Performance degrades after heavy db operation oh, and take the time to upgrade to newest 8.1.X as the matter of urgency!. -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
Re: [GENERAL] Postgres's Performance degrades after heavy db operation
Vick Khera writes: > On Mon, Jun 8, 2009 at 9:38 AM, Preeti > Khurana wrote: >> Any ideas/pointers on what could be making the DB slow after all these heavy >> operations being performed? > It seems autovacuum is not running often enough. 8.1's autovacuum isn't very aggressive by default. You might want to play around with its parameters. regards, tom lane -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
Re: [GENERAL] Postgres's Performance degrades after heavy db operation
On Mon, Jun 8, 2009 at 9:38 AM, Preeti Khurana wrote: > Any ideas/pointers on what could be making the DB slow after all these heavy > operations being performed? It seems autovacuum is not running often enough. You may wish to include vacuum in your data update/delete programs so that it runs after some number of those operations. -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
Re: [GENERAL] Postgres's Performance degrades after heavy db operation
oh, and take the time to upgrade to newest 8.1.X as the matter of urgency!. -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
Re: [GENERAL] Postgres's Performance degrades after heavy db operation
On Mon, Jun 8, 2009 at 2:38 PM, Preeti Khurana wrote: > Hi, > > I am using Postgresql 8.1.2 and performing quite a huge number of db > operations ( insert/update/ delete) in around 4 tables. Around 3 million of > db is inserted and then 600 K rows are updated for around 5-6 times during a > day. Its observed that running this process for few days ( 5-6 days) makes > the db access quite slower. Auto-Vacuum is set to ON with other parameters > set to default. > > > > Slony 1.1.5 is being used for the db replication simultaneously. > > > > Any ideas/pointers on what could be making the DB slow after all these heavy > operations being performed? check if vacuum analyze says anythihing about FSM size being too small. -- GJ -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
[GENERAL] Postgres's Performance degrades after heavy db operation
Hi, I am using Postgresql 8.1.2 and performing quite a huge number of db operations ( insert/update/ delete) in around 4 tables. Around 3 million of db is inserted and then 600 K rows are updated for around 5-6 times during a day. Its observed that running this process for few days ( 5-6 days) makes the db access quite slower. Auto-Vacuum is set to ON with other parameters set to default. Slony 1.1.5 is being used for the db replication simultaneously. Any ideas/pointers on what could be making the DB slow after all these heavy operations being performed? Thanks Preeti
