Hello,



I'm new to postgres and the work of DB's.

I'm running postres 7.4 on RHLinux 3.

I have a table that has 5.4 million rows of data in it. 4.6 million of
these rows are just administrative messages and not necessary so I'd like to
delete them. If I try and delete them, it takes 69 minutes to delete ~650K
rows. The current postgres configurations are defaults in postgres.conf
file. I've tried bumping up the shared_bufferes in the conf file, but it
does not help. Also I am unable to start postgres is I change the
shared_buffers to a values higher then 2000.



We have a project underway to upgrade to postgres 8.2, but that will take
some time, so I'd like to delete these in 7.4 if at all possible in a
reasonable amount of time so that I can minimize production impact to
customers.



Any and all suggestion will be greatly appreciated.



Regards

Bharat

"Bharat Patel" <bharatpatelk@gmail.com> writes:
> I have a table that has 5.4 million rows of data in it. 4.6 million of
> these rows are just administrative messages and not necessary so I'd like to
> delete them. If I try and delete them, it takes 69 minutes to delete ~650K
> rows.

I'm betting on an unindexed foreign-key constraint linking to this
table.

regards, tom lane

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