| From: | "sathiya psql" <sathiya(dot)psql(at)gmail(dot)com> |
|---|---|
| To: | pgsql-performance(at)postgresql(dot)org |
| Subject: | postgresql is slow with larger table even it is in RAM |
| Date: | 2008-03-25 08:35:20 |
| Message-ID: | f966c2ee0803250135h57ba1d5bs41f77616ae7186dc@mail.gmail.com |
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| Lists: | pgsql-performance |
Dear Friends,
I have a table with 32 lakh record in it. Table size is nearly 700 MB,
and my machine had a 1 GB + 256 MB RAM, i had created the table space in
RAM, and then created this table in this RAM.
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. ( using vmstat i had confirmed, no disk I/O is
happening, swap is also not used )
Any Idea on this ???
I searched a lot in newsgroups ... can't find relevant things.... ( because
everywhere they are speaking about disk access speed, here i don't want to
worry about disk access )
If required i will give more information on this.
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