Mutating Error In Trigger
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Fix Oracle mutating mutating trigger in oracle 10g with example trigger table errors Oracle Database Tips by Burleson Consulting A mutation table is defined as a table that is mutating trigger with example changing. But in dealing with triggers, it is a table that has the possibility of changing. What this means to a trigger is that if the trigger reads a table, it can notOracle Mutating Trigger Pragma Autonomous Transaction
change the table that it read from. This does not 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 statement level trigger in oracle release of the Oracle database reduces the impact of the mutating table error on triggers 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 wi
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Mutating Table Error In Oracle 11g With Example
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- 8:40 pm UTC Category: SQL*Plus � Version: 8.1.7 Latest Followup You Asked hello, i've got a table MRC and a trigger on it (AFTER INSERT) thus, after an insert in the table MRC, this trigger has https://asktom.oracle.com/pls/apex/f?p=100:11:0%3A%3A%3A%3AP11_QUESTION_ID:9579487119866 to determine if a new line must be inserted into an other table PLAN : for that, it does compare the :new values with the MOST RECENT enregistrement of MRC but i got a http://www.akadia.com/services/ora_mutating_table_problems.html mutating table error i understand the problem but how can i get over ?? thanks Arnaud and we said... My personal opinion -- when I hit a mutating table error, I've got a serious fatal mutating trigger flaw in my logic. Have you considered the multi-user implications in your logic? Two people inserting at the same time (about the same time). What happens then??? Neither will see eachothers work, neither will block -- both will think "ah hah, I am first"... anyway, you can do too much work in triggers, this may well be that time -- there is nothing wrong with doing things in a more trigger in oracle straightforward fashion (eg: using a stored procedure to implement your transaction) but if you persist, you can use the technique: http://asktom.oracle.com/~tkyte/Mutate/index.html to avoid the mutating table constraint -- but I would avoid the situation that gets me there in the first place. The logic is a whole lot more understandable that way (and maintainable and testable and everything) Reviews Write a Review Ora-4091 May 05, 2003 - 5:45 pm UTC Reviewer: A reader We create trigger in the test server (8i) its working without error, and when we created at life (8) we get the following error: ORA-04091: table XXXX is mutating, trigger/function may not see it. Followup May 05, 2003 - 8:31 pm UTC they relaxed some of the constraining rules between 8.0 and 8.1 -- things are in general upwards (develop in 8.0 and goto 8.1) compatible but not backwards. Why I can't get the 4091 error when insert? January 05, 2004 - 3:39 am UTC Reviewer: Li ys from CHINA I only want to prove the mutating table by this triggers: CREATE TABLE r_Module ( Bureauno NUMBER(3), Moduleno NUMBER(3), primary key ( Bureauno, Moduleno ) ); CREATE OR REPLACE TRIGGER LimitTest BEFORE INSERT OR UPDATE ON r_Module FOR EACH ROW DECLARE v_Ma
4 ORA-04088: error during execution of trigger 'TRG_GET_ID_APP'. We studied the "Mutating Table" Problem and found the following explanations in the Oracle8i Application Developer's Guide. A mutating table is a table that is currently being modified by an UPDATE, DELETE, or INSERT statement, or it is a table that might need to be updated by the effects of a declarative DELETE CASCADE referential integrity constraint. The restrictions on such a table apply only to the session that issued the statement in progress. For all row triggers, that were fired as the result of a DELETE CASCADE, there are two important restrictions regarding mutating tables. These restrictions prevent a trigger from seeing an inconsistent set of data. The SQL statements of a trigger cannot read from (query) or modify a mutating table of the triggering statement. Example 1 Select in a mutating table from a row trigger (Tested on Oracle 8.1.7) We want to explain this situation on an example. We have two tables "A" and "B". "A" is the master table and "B" the detail table. We specified a foreign key between "B" and "A" with the CASCADE DELETE option. Here are the CREATE statements drop table B; drop table A; create table A ( ida number not null, vala varchar2(10), primary key(ida)); create table B ( idb number, valb varchar2(10), foreign key (idb) references A (ida) on delete cascade) / create or replace trigger b_br after delete on B for each row declare n integer; begin select count(*) into n from A; dbms_output.put_line('there are ' || n || ' rows in A'); dbms_output.put_line('after statment on B'); dbms_output.new_line; end; / insert into A values(1,'Table A'); insert into A values(2,'Table A'); insert into B values(1,'Table B'); insert into B values(1,'Table B'); commit; set serveroutput on; delete from A where