RE: Number of Columns in a Table & SQL Performance ?

From: Pratap Singh (prsingh1) <"Pratap>
Date: Mon, 9 Mar 2009 12:52:45 -0400
Message-ID: <>

There are pro and cons on both.
If you dealing with update insert to single row from both tables and can carry out same on single combined table in single row - it will help to combine.
If you are dealing with multiple rows update and it span through different number of rows in individual tables and may lead to reading more data in joined table. - this will not help.  

HTH,   PB Singh
Tech Project Manager
Ph: 408 424 2777

P Consider the environment. Please don't print this e-mail unless you really need to.        

[] On Behalf Of Subodh Deshpande Sent: Monday, March 09, 2009 7:46 AM
To:; ORACLE-L Subject: Re: Number of Columns in a Table & SQL Performance ?

Hi Vivkek,  

should not be if you are taking care of indexes...  

thanks and take care..subodh

From: VIVEK_SHARMA <> To: ORACLE-L <> Sent: Monday, 9 March, 2009 18:49:57
Subject: Number of Columns in a Table & SQL Performance ?


Does the number of columns in a table affect the performance of SELECT/INSERT/UPDATE in OLTP Transactions.

If so, why?  

NOTE - Merge of 2 existing tables each has 200 columns approx into a single Table is being planned..  

Thanks in Advance  


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Received on Mon Mar 09 2009 - 11:52:45 CDT

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