Re: Help understanding stat tables - Mailing list pgsql-performance

From Chris Hoover
Subject Re: Help understanding stat tables
Date
Msg-id 200404211224.35696.revoohc@sermonaudio.com
Whole thread Raw
In response to Help understanding stat tables  ("Chris Hoover" <revoohc@sermonaudio.com>)
Responses Re: Help understanding stat tables
List pgsql-performance
I think I have figured my problem out.

I was taking heap_blks_hit / heap_blks_read for my hit pct.

It should be heap_blks_hit/(heap_blks_read+heap_blks_hit), correct?

Thanks
On Wednesday 21 April 2004 11:34, Chris Hoover wrote:
> I just want to make sure that I am interpreting this data correctly.
>
> From pg_statio_user_tables, I have pulled relname, heap_blks_read,
> heap_blks_hit.  I get several rows like this:
> relname                heap_bkls_read    heap_blks_hit
>  clmhdr                           8607161            196547165
>
>
> So this means that I am getting over a 100% cache hit ratio for this table,
> right?  If not, please help me understand what these numbers mean.
>
> Thanks,
>
> Chris
>
>
> ---------------------------(end of broadcast)---------------------------
> TIP 3: if posting/reading through Usenet, please send an appropriate
>       subscribe-nomail command to majordomo@postgresql.org so that your
>       message can get through to the mailing list cleanly


pgsql-performance by date:

Previous
From: Frédéric Robinet
Date:
Subject: Shared buffers, Sort memory, Effective Cache Size
Next
From: Edoardo Ceccarelli
Date:
Subject: Re: slow seqscan