Oracle Mutation Error
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FixMutating Trigger In Oracle 10g With Example
Oracle mutating trigger table errors Oracle Database Tips by Burleson Consulting A mutation table is defined as a table that
Oracle Mutating Trigger Pragma Autonomous Transaction
is 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
Mutating Trigger With Example
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 causes an insert on a child table referencing a foreign key. Mutating statement level trigger in oracle 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 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
Social Links Printer Friendly About Search 8i | 9i | 10g | 11g | 12c | 13c | oracle instead of trigger Misc | PL/SQL | SQL | RAC | WebLogic | Linux ora-04091 solution Home » Articles » 9i » Here Mutating Table Exceptions Mutating table exceptions occur when we mutating table error in oracle 11g with example try to reference the triggering table in a query from within row-level trigger code. In this article I'll present examples of how a mutating table exception http://www.dba-oracle.com/t_avoiding_mutating_table_error.htm might occur and simple methods to get round it. Test Schema Mutating Table Demonstration Solution 1 (Collection in Package Variable) Solution 2 (Global Temporary Table) Test Schema The following schema objects are necessary to run the code in this article. CREATE TABLE tab1 ( id NUMBER(10) NOT NULL, description VARCHAR2(50) NOT NULL ); ALTER https://oracle-base.com/articles/9i/mutating-table-exceptions TABLE tab1 ADD ( CONSTRAINT tab1_pk PRIMARY KEY (id) ); CREATE SEQUENCE tab1_seq; CREATE TABLE tab1_audit ( id NUMBER(10) NOT NULL, action VARCHAR2(10) NOT NULL, tab1_id NUMBER(10), record_count NUMBER(10), created_time TIMESTAMP ); ALTER TABLE tab1_audit ADD ( CONSTRAINT tab1_audit_pk PRIMARY KEY (id) ); ALTER TABLE tab1_audit ADD ( CONSTRAINT tab1_audit_tab1_fk FOREIGN KEY (tab1_id) REFERENCES tab1(id) ); CREATE SEQUENCE tab1_audit_seq; Mutating Table Demonstration Let's assume we need to audit the actions on the parent table and for some reason, this involves querying the triggering table. We can demonstrate this with the following package and trigger. We place all our trigger code into a package as follows. CREATE OR REPLACE PACKAGE trigger_api AS PROCEDURE tab1_row_change (p_id IN tab1.id%TYPE, p_action IN VARCHAR2); END trigger_api; / SHOW ERRORS CREATE OR REPLACE PACKAGE BODY trigger_api AS PROCEDURE tab1_row_change (p_id IN tab1.id%TYPE, p_action IN VARCHAR2) IS l_count NUMBER(10) := 0; BEGIN SELECT COUNT(*) INTO l_count FROM tab1; INSERT INTO tab1_audit (id, action, tab1_id, re
RESOURCES Database Tools SQL Scripts & Samples Links » Database Forum » Slideshows http://www.databasejournal.com/features/oracle/article.php/3329121/The-Mutation-error-in-Oracle-Database-Triggers.htm » Sitemap Free Newsletters: DatabaseDaily News Via RSS Feed Database https://decipherinfosys.wordpress.com/2009/06/22/mutating-tabletrigger-error-and-how-to-resolve-it/ Journal |DBA Support |SQLCourse |SQLCourse2 Featured Database Articles Oracle Posted Mar 23, 2004 The Mutation error in Oracle Database Triggers By Amar Kumar Padhi The Mutating table error is a well-known problem encountered in development; most developers have come mutating trigger across this error. ORA-04091: table
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