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Re: Windows XP selects are very slow

From: "Usama Munir Dar" <usama(dot)munir(at)enterprisedb(dot)com>
To: "Shadkam Islam" <shadkam(at)ba-sys(dot)com>
Cc: <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Windows XP selects are very slow
Date: 2007-11-28 16:15:09
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
PG generally comes with very basic default settings, one *start* maybe 
this page for you

Then obviously you will need to work though your query plans and iterate.

Shadkam Islam wrote:
> Hi All,
> We are having a table whose data we need to bucketize and show. This is
> a continuously growing table (archival is a way to trim it to size).
> We are facing 2 issues here:
> 1. When the records in the table are in the range of 10K, it works fine
> for some time after starting postgres server. But as time passes, the
> entire machine becomes slower and slower - to the extent that we need to
> go for a restart. Though taskmgr does not show any process consuming
> extra-ordinary amount of CPU / Memory. After a restart of postgres
> server, things come back to normal. What may be going wrong here?
> 2. When the records cross 200K, the queries (even "select count(*) from
> _TABLE_") start taking minutes, and sometimes does not return back at
> all. We were previously using MySql and at least this query used to work
> OK there. [Our queries are of the form "select sum(col1),  sum(col2),
> count(col3) ... where .... group by ... " ]. Any suggestions ... 
> Below is the tuning parameter changes thet we did with the help from
> internet:
> We are starting postgres with the options [-o "-B 4096"], later we added
> a "-S 1024" as well - without any visible improvement.
> Machine has 1GB RAM.
> shadkam
> ---------------------------(end of broadcast)---------------------------
> TIP 5: don't forget to increase your free space map settings

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