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From
stephane tessier
Date:

Hi,

i have a problem with index in pgsql 7.2.1(i think it's indexes the problem). I insert a lot of records in a table and delete in a ratio of 1:5... When I do request on this table..it's working fine for 10-12 hours but after it's very slow (10-15 minutes) but when I delete the indexes and recreate it.. it's ok for 10-12 hours again.. it's a live db 24/7... I cannot stop the db often... process insert record all the time...

have idea? pgsql problem?

 

thanks

 

Stephane


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Re:

From
"Shridhar Daithankar"
Date:
On 18 Oct 2002 at 15:58, stephane tessier wrote:

>
> Hi,
> i have a problem withindex in pgsql 7.2.1(i think it's indexes the problem). I
> insert a lot of records in a table and delete in a ratio of 1:5... When I do
> request on this table..it's working fine for 10-12 hours but after it's very
> slow (10-15 minutes) but when I delete the indexes and recreate it.. it's ok
> for 10-12 hours again.. it's a live db 24/7... I cannot stop the db often...
> process insert record all the time...
> have idea? pgsql problem?

You should do a vacuum analyze the db often. Something like for each 5000
deletes+insert. Put it in a cron job if required.

And insertion in indexed table is always going to be slower for large amount of
data. There is no way out..

HTH

Bye
 Shridhar

--
Mustgo, n.:    Any item of food that has been sitting in the refrigerator so    long
it has become a science project.        -- Sniglets, "Rich Hall & Friends"

Re:

From
Doug McNaught
Date:
"Shridhar Daithankar" <shridhar_daithankar@persistent.co.in> writes:

> On 18 Oct 2002 at 15:58, stephane tessier wrote:
>
> > i have a problem withindex in pgsql 7.2.1(i think it's indexes the
> > problem). I insert a lot of records in a table and delete in a
> > ratio of 1:5... When I do request on this table..it's working fine
> > for 10-12 hours but after it's very slow (10-15 minutes) but when
> > I delete the indexes and recreate it.. it's ok for 10-12 hours
> > again.. it's a live db 24/7... I cannot stop the db often...
> > process insert record all the time...  have idea? pgsql problem?
>
> You should do a vacuum analyze the db often. Something like for each 5000
> deletes+insert. Put it in a cron job if required.

He should probably also REINDEX the database every night, since VACUUM
doesn't handle all types of index growth.

-Doug