sathiya psql escribió:
> So now everything is in RAM, if i do a count(*) on this table it returns
> 327600 in 3 seconds, why it is taking 3 seconds ????? because am sure that
> no Disk I/O is happening.
It has to scan every page and examine visibility for every record. Even
if there's no I/O involved, there's a lot of work to do. I am not sure
if with your hardware it is expected for it to take 3 seconds though.
Do you see high CPU usage during that period?
Alvaro Herrera http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support
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