Re: [PERFORM] Delete performance again

2008-10-03 Thread Marc Mamin
Hi, Maybe you can try this syntax. I'm not sure, but it eventually perform better: delete from company_alias USING comprm where company_alias.company_id =comprm.id Cheers, Marc -- Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org) To make changes to your subscript

Re: [PERFORM] 7.4 - basic tuning question

2008-10-03 Thread Richard Huxton
Simon Waters wrote: The best advice is to "upgrade at your earliest convenience" with performance questions and 7.4 - you're missing a *lot* of improvements. You say you're planning to anyway, and I'd recommend putting effort into the upgrade rather than waste effort on tuning a system you're leav

[PERFORM] 7.4 - basic tuning question

2008-10-03 Thread Simon Waters
Hi, we have a log table on one server with 1.9 million records. One column "event" (type text) in that table is a string that (currently) takes a small number of distinct values (~43) (hmm that could have been normalised better). We noted on querying for events of a specific type, that the que

Re: [PERFORM] Slow Inserts on large tables

2008-10-03 Thread Tom Lane
"Peter Childs" <[EMAIL PROTECTED]> writes: > 2008/10/3 Peter Eisentraut <[EMAIL PROTECTED]>: >> Then show us your checkpointing-related parameters. > I've currently got them set to > checkpoint_segments = 3 > checkpoint_timeout = 180s > checkpoint_completion_target = 0.5 > after reading that doi

Re: [PERFORM] dedicated server & postgresql 8.1 conf tunning

2008-10-03 Thread Thomas Spreng
On 2. Oct, 2008, at 10:00, <[EMAIL PROTECTED]> <[EMAIL PROTECTED]> wrote: Unfornatly, i can't update pgsql to 8.3 since it's not in debian stable. Did you consider using backport packages (http://www.backports.org) for Debian Etch? They are providing postgresql v.8.3.3 packages for Debian E

Re: [PERFORM] Slow Inserts on large tables

2008-10-03 Thread Iulian Dragan
Peter, (please take this with a pinch of salt as I am no expert) Here is  a possible scenario: Each of your checkpoints takes 90 seconds or more (you told it  so with the checkpoint_completion_target). If your insert fills 3 checkpoint segments (48 megs ) in less than 90 seconds then a new che

Re: [PERFORM] Slow Inserts on large tables

2008-10-03 Thread Peter Childs
2008/10/3 Peter Eisentraut <[EMAIL PROTECTED]>: > Peter Childs wrote: >> >> I have a problem where by an insert on a "large" table will sometimes >> take longer than usual. > >> I think the problem might have something to do with checkpoints, > > Then show us your checkpointing-related parameters.

Re: [PERFORM] Slow Inserts on large tables

2008-10-03 Thread Peter Eisentraut
Peter Childs wrote: I have a problem where by an insert on a "large" table will sometimes take longer than usual. I think the problem might have something to do with checkpoints, Then show us your checkpointing-related parameters. Or try to set them to a lot higher values so checkpoints ha

[PERFORM] Slow Inserts on large tables

2008-10-03 Thread Peter Childs
I have a problem where by an insert on a "large" table will sometimes take longer than usual. Usually the inserts are quick then from time to time they will take a long time sometimes as much as 10seconds or longer. (But usually under 500ms which is when I start logging them) The queries are slow