ISOLATION LEVEL
- From: "DBA Deepak" <oracle.tutorials@xxxxxxxxx>
- To: oracle-l <oracle-l@xxxxxxxxxxxxx>
- Date: Tue, 10 Jul 2007 14:39:28 +0530
Hi All,
Have a doubt on transaction isolation.
My requirement is to query several tables several times inside a piece of
code. The data needs to be consistent across multiple queries. The
underlying tables are subjected to change during the execution of the piece
of code.
I have two options to be used inside my piece of code to achieve
consistent/repeatable reads.
1> to use SET TRANSACTION READ ONLY;
2> to use ALTER SESSION SET ISOLATION_LEVEL=SERIALIZABLE;
My question is which option is preferable and why? Is there any performance
issues with one of these in the above mentioned scenarios?
Need your valuable feedback.
--
Regards,
Deepak
Oracle DBA
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