Good evening,

Does anyone know how much of a performance hit turning stats_block_level and
stats_row_level on will incur? Do both need to be on to gather cache
related statistics? I know the annotated_conf_80 document states to only
turn them on for debug but if they're not that performance intensive I
cannot see the harm.

Thank you,
Tim McElroy

On Mon, Mar 13, 2006 at 06:49:39PM -0500, mcelroy, tim wrote:
> Does anyone know how much of a performance hit turning stats_block_level and
> stats_row_level on will incur? Do both need to be on to gather cache
> related statistics? I know the annotated_conf_80 document states to only
> turn them on for debug but if they're not that performance intensive I
> cannot see the harm.

I ran some tests a few months ago and found that stats_command_string
had a significant impact, whereas stats_block_level and stats_row_level
were almost negligible. Here are my test results:

http://archives.postgresql.org/pgsql...2/msg00307.php

Your results may vary. If you see substantially different results
then please post the particulars.

--
Michael Fuhr

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Tim,

When I have done ODBC load tests with stats_block_level enabled on (20
mins. per test), I've seen about 3-4% performance hit. Your mileage may
vary.

Steve Poe

On Mon, 2006-03-13 at 18:49 -0500, mcelroy, tim wrote:
> Good evening,
>
> Does anyone know how much of a performance hit turning
> stats_block_level and stats_row_level on will incur? Do both need to
> be on to gather cache related statistics? I know the
> annotated_conf_80 document states to only turn them on for debug but
> if they're not that performance intensive I cannot see the harm.
>
> Thank you,
> Tim McElroy
>


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