On Wednesday 14 January 2004 11:11, Sezai YILMAZ wrote:
> Hi,
>
> I use PostgreSQL 7.4 for storing huge amount of data. For example 7
> million rows. But when I run the query "select count(*) from table;", it
> results after about 120 seconds. Is this result normal for such a huge
> table? Is there any methods for speed up the querying time? The huge
> table has integer primary key and some other indexes for other columns.
PG uses MVCC to manage concurrency. A downside of this is that to verify the
exact number of rows in a table you have to visit them all.
There's plenty on this in the archives, and probably the FAQ too.
What are you using the count() for?
--
Richard Huxton
Archonet Ltd
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