Message-ID: <4CC5D2CD.40403@vmsinfo.com>
Date: Mon, 25 Oct 2010 14:56:13 -0400
From: Mladen Gogala <mladen.gogala@vmsinfo.com>
Organization: VMS
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To: Divakar Singh <dpsmails@yahoo.com>
CC: Scott Marlowe <scott.marlowe@gmail.com>,
	"pgsql-performance@postgresql.org" <pgsql-performance@postgresql.org>
Subject: Re: Postgres insert performance and storage requirement
	compared to Oracle
References: <402913.53404.qm@web65405.mail.ac4.yahoo.com>
	<AANLkTinB1yN0u61EGceCXq6Tjp+RuQ0-JDRp5usZAfWp@mail.gmail.com>
	<781874.42830.qm@web65413.mail.ac4.yahoo.com>
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Profiling could tell you where is the time lost and where is your 
program spending time. Having experience with both Oracle and Postgres, 
I don't feel that there is much of a difference in the insert speed. I 
am not using C++, I am using scripting languages like Perl and PHP and, 
as far as inserts go, I don't see much of a difference. I have an 
application which inserts approximately 600,000 records into a 
PostgreSQL 9.0.1 per day, in chunks of up to 60,000 records every hour. 
The table is partitioned and there are indexes on the underlying 
partitions. I haven't noticed any problems with inserts. Also, if I use 
"copy" instead of the "insert" command, I can be even faster.  In 
addition to that, PostgreSQL doesn't support index organized tables.

Divakar Singh wrote:
> Storage test was simple, but the data (seconds taken) for INSERT test 
> for PG vs Oracle for 1, 2, 3,4 and 5 indexes was:
> PG:
> 25
> 30
> 37
> 42
> 45
>
>
>
> Oracle:
>
> 33
> 43
> 50
> 65
> 68
>
> Rows inserted: 100,000
> Above results show good INSERT performance of PG when using SQL 
> procedures. But performance when I use C++ lib is very bad. I did that 
> test some time back so I do not have data for that right now.
>
> ------------------------------------------------------------------------
> *From:* Scott Marlowe <scott.marlowe@gmail.com>
> *To:* Divakar Singh <dpsmails@yahoo.com>
> *Cc:* pgsql-performance@postgresql.org
> *Sent:* Mon, October 25, 2010 11:56:27 PM
> *Subject:* Re: [PERFORM] Postgres insert performance and storage 
> requirement compared to Oracle
>
> On Mon, Oct 25, 2010 at 12:12 PM, Divakar Singh <dpsmails@yahoo.com 
> <mailto:dpsmails@yahoo.com>> wrote:
> > Hello Experts,
> > My application uses Oracle DB, and makes use of OCI interface.
> > I have been able to develop similar interface using postgreSQL library.
> > However, I have done some tests but results for PostgreSQL have not been
> > encouraging for a few of them.
>
> Tell us more about your tests and results please.
>


-- 
 
Mladen Gogala 
Sr. Oracle DBA
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