Re: Performance (was: The New Slashdot Setup (includes MySql server))

Hi,

Chris:
> VACUUM is not a speed-up feature, it's a slow-down feature. It reclaims
> space and that takes time. It does update system statistics which can
> help performance if done after a data load or perhaps once a day.
>
OK, thanks for the clarification.

> But "sprinkling the code" with vacuum sounds like a big performance
> killer. Hope you are not counting vacuum as part of your 1000 read()
> calls.
>
Nonono, the 1000 read() calls are triggered by a simple INSERT or UPDATE
call. They actually scan the pg_index table of the benchmark database.

Why they do that is another question entirely. (a) these tables should
have indices, and (b) whatever postgres wants to know should have been
cached someplace. Oh yes, (c) what's in pg_index that needs to be 4
MBytes big?

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