Oracle Mutating Error
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is in state of flux (being mutating trigger in oracle 10g with example changed), it is considered "mutating", and raises an error since Oracle mutating trigger with example should never return inconsistent data. Another way this error can occur is if the trigger has statements to change
Oracle Mutating Trigger Pragma Autonomous Transaction
the primary, foreign or unique key columns of the table off which it fires. If you must have triggers on tables that have referential constraints, the workaround is to enforce the referential integrity through triggers as well. oracle statement level trigger Glossary of Terms A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # Retrieved from "http://www.orafaq.com/wiki/index.php?title=Mutating_table&oldid=5489" Category: 9 Navigation menu Views Page Discussion Edit History Personal tools Log in / create account Site Navigation Wiki Home Forum Home Blogger Home Site highlights Blog Aggregator FAQ's Mailing Lists Usenet News RSS Feeds Wiki Navigation Categories Recent changes Random page Help Search Tools What links here Related changes Special pages Printable version Permanent link Page information This page was last modified on 13 November 2007, at 15:20. Privacy policy About Oracle Wiki Disclaimers
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ora-04091 solution Fix Oracle mutating trigger table errors Oracle Database TipsOracle Instead Of Trigger
by Burleson Consulting A mutation table is defined as a table that is changing. But in dealing with triggers, it is
Mutating Table Error In Oracle 11g With Example
a table that has the possibility of changing. What this means to a trigger is that if the trigger reads a table, it can not change the table that it read from. This does not http://www.orafaq.com/wiki/Mutating_table impact the exclusive use of :OLD and :NEW. It says that if the trigger reads the table (such as using a SELECT query), that changes (even using :NEW) will fail. This can also happen when a trigger on a parent table causes an insert on a child table referencing a foreign key. Mutating Tables Each new release of the Oracle database reduces the impact of the mutating table error on triggers http://www.dba-oracle.com/t_avoiding_mutating_table_error.htm and they are much less of a problem with Oracle9i and above. If a trigger does result in a mutating table error, the only real option is to rewrite the trigger as a statement-level trigger. Mutating table errors only impact row level triggers. But to use a statement level trigger, some data may need to be preserved from each row, to be used by the statement level trigger. This data can be stored in a PL/SQL collection or in a temporary table. A simple row level trigger that causes a mutating table error can result in a very complicated statement level trigger to achieve the needed result. Here are some important items to remember about triggers. On insert triggers have no :OLD values. On delete triggers have no :NEW values. Triggers do not commit transactions. If a transaction is rolled back, the data changed by the trigger is also rolled back. Commits, rollbacks and save points are not allowed in the trigger body. A commit/rollback affects the entire transaction, it is all or none. Unhandled exceptions in the trigger will cause a rollback of the entire transaction, not just the trigger. If more than one trigger is defined on an event, the order in which they fire is not defined. I
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Was this answer useful?Yes 1 Reply manikandan Dec 8th, 2006 if the trigger attempts to select or modify the table while the trigger has not completed (ie. table is in transition). then mutating trigger error occurs.because the table is in middle of a transaction so it causes the trigger to mutate.you can change the trigger to statement level and apply the logic there. Was this answer useful?Yes Reply vikramssheth ProfileAnswers by vikramssheth Jan 30th, 2007 We can override this problem using temporary Table Concept. Was this answer useful?Yes Reply sripri ProfileAnswers by sripriQuestions by sripri May 8th, 2007 Mutating trigger has similar concept to that of deadlock. When a table is in the half way of executing a transaction and is the owner of a trigger and if the same table is accessed by the trigger somewhere else in the same time then at that instance mutating trigger occurs. Was this answer useful?Yes Reply Robert ProfileAnswers by RobertQuestions by Robert May 8th, 2007 To avoid Mutating trigger there are many ways. One of the best a