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List:       pgsql-performance
Subject:    Re: [PERFORM] Curious about dead rows.
From:       Jean-David Beyer <jeandavid8 () verizon ! net>
Date:       2007-11-14 14:58:33
Message-ID: 473B0D19.4000509 () verizon ! net
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Alvaro Herrera wrote:
> Jean-David Beyer wrote:
> 
>> How do I reset the counters in pg_stat_database and pg_stat_all_tables?
>> I tried just restarting postgres, but it seems to be saved in the database,
>> not just in the RAM of the server.
> 
> There is a function called pg_stat_reset() or some such.

I'll find it.
> 
>> I suppose that blks_read and blks_hit are zero because there are 8 GBytes
>> RAM on this machine and I give 2GBytes to shared_buffers = 253000 so that
>> all sits in RAM.
> 
> Perhaps you have stats_block_level set to off?

True, I will turn them on.
> 
>> I know there have been rollbacks but I do a REINDEX, CLUSTER, and VACUUM
>> ANALYZE before starting the inserts in question.
> 
> You do all three on the same tables?  That seems pretty pointless.  A
> sole CLUSTER has the same effect.

I was only doing this to be sure to clean everything up for this data
gathering process and wanted to know I did not miss anything.
> 
>> Do I need to do a VACUUM FULL ANALYZE instead?
> 
> No.
> 


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