Maintenance_work_mem question

We are upgrading from postgres 7.4.5 to 8.2.4 in a couple weeks. I am
debating as to what

I should set my maintenance_work_mem and shared_buffers parameters to.

Here are some of our current resources

Total memory on machine: 32GB

Total disks - 5 Raid 10 (so five primary, five mirrored)

Total database size: 60GB

Total number of tables: 300

Total number of indexes: 500

Max connections: 200

Average connections at one time: 10 - 15

We currently set our 7.4.5 vacuum_mem to 1 GB. I understand we don't want

That any higher as we risk overflowing our 32 bit configuration. But, since

We will be running autovacuum for the first time I assume that this will be
pulling memory

According to our maintenance_work_mem value perpetually during the day, so
perhaps

I should set it smaller than 1 Gig?

Also, our 7.4.5 shared buffers value is currently at 150,000 buffers. I
know this is

Very large for 7.4.5 but may be more appropriate for 8.2.4. Any thoughts?

Thank you,

Mark Steben

Senior Database Administrator
@utoRevenueT
A Dominion Enterprises Company
480 Pleasant Street
Suite B200
Lee, MA 01238
413-243-4800 Home Office
413-243-4809 Corporate Fax

msteben <blocked::mailto:name(at)autorevenue(dot)com> @autorevenue.com

Visit our new website at
<blocked::http://www.autorevenue.com/> www.autorevenue.com

IMPORTANT: The information contained in this e-mail message is confidential
and is intended only for the named addressee(s). If the reader of this
e-mail message is not the intended recipient (or the individual responsible
for the delivery of this e-mail message to the intended recipient), please
be advised that any re-use, dissemination, distribution or copying of this
e-mail message is prohibited. If you have received this e-mail message in
error, please reply to the sender that you have received this e-mail message
in error and then delete it. Thank you.

Come Visit Us at NADA! Booth #5735N
February 9th - February 12th
Moscone Center in San Francisco, CA