Mutating Error
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Mutating Trigger In Oracle 11g
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Oracle Mutating Trigger Pragma Autonomous Transaction
takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top What are the causes and solutions for mutating table errors? up vote 7 down vote favorite 1 I understand mutating table errors are caused by a design flaw or problematic query. An old query was
Ora-04091 Solution
recently put into production which throws a mutating table error. Our DBA solved the problem but we do not know how. What exactly causes mutating table errors and how would our DBA have fixed the problem? sql oracle trigger plsql share|improve this question edited Jun 25 '15 at 17:56 Mahi_0707 1033 asked Sep 6 '11 at 8:46 parmanand 112238 add a comment| 3 Answers 3 active oldest votes up vote 13 down vote accepted The most likely cause of a mutating table error is the misuse of triggers. Here is a typical example: you insert a row in table A a trigger on table A (for each row) executes a query on table A, for example to compute a summary column Oracle throws an ORA-04091: table A is mutating, trigger/function may not see it This is an expected and normal behaviour, Oracle wants to protect you from yourself since Oracle guarantees: (i) that each statement is atomic (i.e will either fail or succeed completely) (ii) that each statement sees a consistent view of the data Most likely when you write this kind of trigger you would expect the que
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Statement Level Trigger In Oracle
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Social Links Printer Friendly About Search 8i | 9i | 10g | 11g | 12c | 13c | Misc https://oracle-base.com/articles/9i/mutating-table-exceptions | PL/SQL | SQL | RAC | WebLogic | Linux Home » Articles » 9i » Here Mutating Table Exceptions Mutating table exceptions occur when we try http://www.techrepublic.com/article/learn-to-avoid-the-mutating-table-problem-in-oracle/ 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 might occur mutating trigger 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 TABLE tab1 trigger in oracle 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, record_count, created_time) VALUES (tab1_audit_seq.NEXTVAL, p_actio
United States Australia United Kingdom Japan Newsletters Forums Resource Library Tech Pro Free Trial Membership Membership My Profile People Subscriptions My stuff Preferences Send a message Log Out TechRepublic Search GO Topics: CXO Cloud Big Data Security Innovation Software Data Centers Networking Startups Tech & Work All Topics Sections: Photos Videos All Writers Newsletters Forums Resource Library Tech Pro Free Trial Editions: US United States Australia United Kingdom Japan Membership Membership My Profile People Subscriptions My stuff Preferences Send a message Log Out Data Management Learn to avoid the mutating table problem in Oracle Mutating tables in Oracle can drive any IT database manager insane when it comes to tracking down the culprit. With a clear idea of the table design required, however, this problem can be avoided. By Scott Robinson | April 14, 2003, 12:00 AM PST RSS Comments Facebook Linkedin Twitter More Email Print Reddit Delicious Digg Pinterest Stumbleupon Google Plus Tables are everything to IT database managers in ERP database environments. The organization of database tables, their relationships, and the manner in which they are managed are a fair indicator of the overall quality of performance you can expect from the system.So when something can happen to mess up your tables, you want to watch out for it. In Oracle, there’s a nasty snare out there waiting for you. It's Oracle error ORA-04091, the mutating table error, and the best way to deal with it is to avoid it altogether. This article will explain why.When tables mutateThere are several causes of mutating tables, but in general a table mutation error will result if you create a trigger on a table that attempts to examine the current table. Also, the error is given when an attempt is made to examine a parent table in a cascading update/delete.Why are these considered errors? It’s obvious when you think about it: The trigger is trying to change or examine something that’s already being changed. This confuses Oracle, and understandably so. In a row-level trigger firing, when the trigger is about to fire for the second row in a multirow update, what is Oracle to do? Does the application intend that Oracle see the table in its pre-update state? Or does it intend to see it after it has just been updated? Oracle doesnâ€