Rob,

> vacuum_mem might be slowing down the system?  But if I reduce it,
> won't vacuuming get slower?

Yes, but it will have less of an impact on the system while it's running.

> INFO:  Removed 8368 tuples in 427 pages.
>         CPU 0.06s/0.04u sec elapsed 1.54 sec.
> INFO:  Pages 24675: Changed 195, Empty 0; Tup 1031519: Vac 8368, Keep 254,
> UnUsed 1739. Total CPU 2.92s/2.58u sec elapsed 65.35 sec.
>
> INFO:  Removed 232 tuples in 108 pages.
>         CPU 0.01s/0.02u sec elapsed 0.27 sec.
> INFO:  Pages 74836: Changed 157, Empty 0; Tup 4716475: Vac 232, Keep 11,
> UnUsed 641.
>         Total CPU 10.19s/6.03u sec elapsed 261.44 sec.

What sort of disk array do you have?   That seems like a lot of time 
considering how little work VACUUM is doing.


-- 
Josh Berkus
Aglio Database Solutions
San Francisco

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