We have two PostgreSQL servers (8.2) running in a cluster.
We have autovacuum switched on on both servers and also we are running
the following as a cron job;
Server 1:
30 0,2,4,6,8,10,12,14,16,18,20,22 * * * /usr/bin/vacuumdb --all --analyze
Server 2:
30 1,3,5,7,9,11,13,15,17,19,21,23 * * * /usr/bin/vacuumdb --all --analyze
So, in other words we stagger the jobs one each server in the cluster.
Now, we're not seeing any problems with performance and we're not seeing
any bloat but I have a couple of questions which I hope some of you can
help me out on.
1) Is using the autovacuum daemon and running vacuumdb from a cron job
overkill?
2) The vendor of the clustering software suggests that I regularly run
vacuum --all --analyze on a specific table. Surely, if I'm running
vacuumdb --all --analyze isn't this just a wrapper for running the
vacuum --all --analyze command anyway? I guess that I'm asking why
would I want to run vacuum --all --analyze on a specific table, when I
regularly run vacuumdb --all --analyze on all databases?
Any help would be grateful.
Thanks
John
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