On Aug 10, 2006, at 1:57 AM, John Sidney-Woollett wrote:
Disagree.
We only apply reindex on tables that see lots of updates...
With our 7.4.x databases we vacuum each day, but we see real
performance gains after re-indexing too - we see lower load
averages and no decrease in responsiveness over time. Plus we have
the benefit of reduced disk space usage.
You may be getting temporary performance gains by shrinking the
indexes to a level that's un-sustainable. As you update the table, it
needs to create new index keys, which have to go somewhere.
Also, if I had a dollar for everytime someone thought they were safe
from bloat because they were vacuuming once a day, I'd be living on a
beach somewhere. There's very few databases I've seen where vacuuming
once a day is sufficient, so it's very likely that you are suffering
fromm bloat.
I think that the two things go hand in hand, although vacuum is the
most important.
John
Jim C. Nasby wrote:
And if you're vacuuming frequently enough, there shouldn't be that
much
need to reindex.
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Jim C. Nasby, Sr. Engineering Consultant jnasby@xxxxxxxxxxxxx
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