I'm trying to update a table that has about 600.000 records.
The update query is very simple : update mytable set pagesdesc = - pages ;
(I use pagesdesc to avoid problems with sort that have one field in ascending order and one in descending order. That was a problem I had a week ago)
The query takes about half an hour to an hour to execute. I have tried a lot of things.
This is my setup
Linux Slackware 10.1
Postgres 8.0.1
My filesystem has EXT2 filesystem so I don't have journaling.
My partition is mounted in fstab with the noatime option.
I have tried to change some settings in $PGDATA/postgresql.conf. But that does not seem to matter a lot.
I'm not even sure that file is being used. I ran KSysGuard when executing my query and I don't see my processor being used more than 20%
The memory increases for the cache, but not for the app itself.
My testsystem is an Asus portable, P4 with 1 Gig of RAM.
Disk is speedy. All runs fine except for the update queries.
I would appreciate some help or a document to point me to the settings I must change.
Met vriendelijke groeten,
Bien à vous,
Kind regards,
Yves Vindevogel
Implements
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