How To Remove Mutating Table Error In Oracle
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Mutating Trigger In Oracle 11g
Don Burleson Blog
mutating trigger in oracle 10g with example Fix Oracle mutating trigger table errors Oracle Database Tips by Burleson Consulting A mutation table mutating trigger with example is defined as a table that is changing. But in dealing with triggers, it is a table that has the possibility of changing. What this means to a trigger isOracle Mutating Trigger Pragma Autonomous Transaction
that if the trigger reads a table, it can not 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
Statement Level Trigger In Oracle
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 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 r
- 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 pragma autonomous_transaction in trigger has to determine if a new line must be inserted into an other table
Ora-04091 Solution
PLAN : for that, it does compare the :new values with the MOST RECENT enregistrement of MRC but i got a mutating table error in oracle 11g with example 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 http://www.dba-oracle.com/t_avoiding_mutating_table_error.htm 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 https://asktom.oracle.com/pls/apex/f?p=100:11:0%3A%3A%3A%3AP11_QUESTION_ID:9579487119866 more 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 DE
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 http://www.akadia.com/services/ora_mutating_table_problems.html is a table that might need to be updated by the effects of a declarative https://www.techonthenet.com/oracle/errors/ora04091.php 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 in oracle 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 trigger in oracle 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 idA = 1; ERROR at line 1: ORA-04091: table SCOTT.A is mutating, trigger/function may not see ORA-06512: at "SCOTT.B_BR", line 4 ORA-04088: error during execution of trigger 'SCOTT.B_BR' Notice that the SQL statement ( "select count(*) into n from A" ) is run for the first row of the table, and then the AFTER row trigger B_BR is fired. In turn, a statement in the AFTER row trigger body attempts to query the original table A. However, because the table A is mutating due to the CASCADE DELETE foreign key, this query is not allowed by Oracle. If attempted, a runtime error occurs, the effects of the trigger body and triggering statement are rolled back, and control is returned to the user or application. Solution: Use stateme
MySQL MariaDB PostgreSQL SQLite MS Office Excel Access Word Web Development HTML CSS Color Picker Languages C Language More ASCII Table Linux UNIX Java Clipart Techie Humor Advertisement Oracle Basics ALIASES AND AND & OR BETWEEN COMPARISON OPERATORS DELETE DISTINCT EXISTS FROM GROUP BY HAVING IN INSERT INSERT ALL INTERSECT IS NOT NULL IS NULL JOIN LIKE MINUS NOT OR ORDER BY PIVOT REGEXP_LIKE SELECT SUBQUERY TRUNCATE UNION UNION ALL UPDATE WHERE Oracle Advanced Oracle Cursors Oracle Exception Handling Oracle Foreign Keys Oracle Loops/Conditionals Oracle Transactions Oracle Triggers String/Char Functions Numeric/Math Functions Date/Time Functions Conversion Functions Analytic Functions Advanced Functions Oracle / PLSQL: ORA-04091 Error Message Learn the cause and how to resolve the ORA-04091 error message in Oracle. Description When you encounter an ORA-04091 error, the following error message will appear: ORA-04091: table name is mutating, trigger/function may not see it Cause A statement executed a trigger or custom PL/SQL function. That trigger/function tried to modify or query a table that is currently being modified by the statement that fired the trigger/function. Resolution The option(s) to resolve this Oracle error are: Option #1 Re-write the trigger/function so that it does not try to modify/query the table in question. For example, if you've created a trigger against the table called orders and then the trigger performed a SELECT against the orders table as follows: CREATE OR REPLACE TRIGGER orders_after_insert AFTER INSERT ON orders FOR EACH ROW DECLARE v_quantity number; BEGIN SELECT quantity INTO v_quantity FROM orders WHERE order_id = 1; END; You would receive an error message as follows: When you create a trigger against a table, you can't modify/query that table until the trigger/function has completed. Remember that you can always use the :NEW and :OLD values within the trigger, depending on the type of trigger. Lea