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Re: ** temp table or permanent

From: A Joshi <ajoshi977_at_yahoo.com>
Date: Wed, 5 Jul 2006 13:05:26 -0700 (PDT)
Message-ID: <20060705200526.11597.qmail@web60714.mail.yahoo.com>


Alex,

     Thanks. I am on 8.1.7.4. So it is not automatic UNDO. I already split thequery in two. Right now the question is if I should use temporary/permanent table or PL/SQL table. I assume PL/SQL table will always be faster than temporary table. We have dedicated server so I think it is using memory from main memory and not affecting SGA. How do I keep track of how much memory is being used? I want balance performance and memory. to make sure no paging/swapping occurs. Thanks

Alex Gorbachev <gorbyx_at_gmail.com> wrote:   How do you know you was running out of space in rollback segment? ORA-1555? Usually, SELECT fails with ORA-1555 not because rollback segment is too small but because your undo retention period is too small. I assume you use automatic undo management.

2006/7/5, A Joshi :
>
> Hi,
> I had a big query which was running out of rollback so after some tuning
> i had to break it down in to two. from the first query i store the result in
> a temporary table and then use it for second part. it is still slow. i did
> not use permament table since that could involve rollback/redo. but still i
> will try to check it. i am also thinking of pl/sql table but if that always
> remains in memory then it could impact memory or sga. pl/sql table uses pga
> or OS memory but if paging swapping occurs then it would impact sga too.
> Will it always be faster than temp or permanent table? Can some one give
> feedback if you had similar experience. Thanks for help.
>
>
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-- 
Best regards,
Alex Gorbachev

http://blog.oracloid.com


 		
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Received on Wed Jul 05 2006 - 15:05:26 CDT

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