I also tried a simple select * from tblcase where clientum = 'SAKS'

On both MSSQL and Postgres.

MSSQL was 3 secs, Postgres was 27 secs.



There is a key for clientnum, but it appeared on both systems (identical
Dell Desktops Postgres is running Linux MSSQL is XP) it did not do a indexed
search.



Joel Fradkin



Wazagua, Inc.
2520 Trailmate Dr
Sarasota, Florida 34243
Tel. 941-753-7111 ext 305



jfradkin@wazagua.com
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"Joel Fradkin" <jfradkin@wazagua.com> writes:

> I also tried a simple select * from tblcase where clientum = 'SAKS'

Try:

explain analyze select * from tblcase where clientum = 'SAKS'

Send the output.

--
greg


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On Tue, Jan 25, 2005 at 21:21:08 -0700,
Dennis Sacks <dennis@illusions.com> wrote:
>
> One of the things you'll want to do regularly is run a "vacuum analyze".
> You can read up on this in the postgresql docs. This is essential to the
> indexes being used properly. At a bare minimum, after you import a large
> amount of data, you'll want to run vacuum analyze.

Note that there is no need to vacuum after inserts (only updates and deletes),
so you can just do an analyze in that case.

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Joel Fradkin wrote:

> I also tried a simple select * from tblcase where clientum = 'SAKS'
>
> On both MSSQL and Postgres.
>
> MSSQL was 3 secs, Postgres was 27 secs.
>
>
>
> There is a key for clientnum, but it appeared on both systems
> (identical Dell Desktops Postgres is running Linux MSSQL is XP) it did
> not do a indexed search.
>

One of the things you'll want to do regularly is run a "vacuum analyze".
You can read up on this in the postgresql docs. This is essential to the
indexes being used properly. At a bare minimum, after you import a large
amount of data, you'll want to run vacuum analyze.

Dennis Sacks
dennis@illusions.com

Bruno Wolff III wrote:

>On Tue, Jan 25, 2005 at 21:21:08 -0700,
> Dennis Sacks <dennis@illusions.com> wrote:
>
>
>>One of the things you'll want to do regularly is run a "vacuum analyze".
>>You can read up on this in the postgresql docs. This is essential to the
>>indexes being used properly. At a bare minimum, after you import a large
>>amount of data, you'll want to run vacuum analyze.
>>
>>
>
>Note that there is no need to vacuum after inserts (only updates and deletes),
>so you can just do an analyze in that case.
>
>
Good point! Analyze after bulk inserts, vacuum analyze after
updates/deletes and inserts.

Dennis Sacks

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QUERY PLAN
"Seq Scan on tblcase (cost=0.00..30066.21 rows=37401 width=996) (actual
time=0.344..962.260 rows=22636 loops=1)"
" Filter: ((clientnum)::text = 'SAKS'::text)"
"Total runtime: 1034.434 ms"

Joel Fradkin

Wazagua, Inc.
2520 Trailmate Dr
Sarasota, Florida 34243
Tel. 941-753-7111 ext 305

jfradkin@wazagua.com
www.wazagua.com
Powered by Wazagua
Providing you with the latest Web-based technology & advanced tools.
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all copies of the original message, including attachments.




-----Original Message-----
From: gsstark@mit.edu [mailto:gsstark@mit.edu]
Sent: Wednesday, January 26, 2005 1:27 AM
To: Joel Fradkin
Cc: pgsql-sql@postgresql.org
Subject: Re: [SQL] same question little different test MSSQL vrs Postgres


"Joel Fradkin" <jfradkin@wazagua.com> writes:

> I also tried a simple select * from tblcase where clientum = 'SAKS'

Try:

explain analyze select * from tblcase where clientum = 'SAKS'

Send the output.

--
greg


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