Ora-04091 Table Is Mutating Trigger/function May Not See It Error
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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 oracle instead of trigger 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. Learn more about Triggers. Share this page: Advertisement Back to top Home | About Us | Contact Us | Testimonials | Donate While using this site, you agree to have read and accepted our Terms of Service and Privacy Policy. We use advertisements to support this website and fund the development of new content. Copyright © 2003-2016 TechOnTheNet.com. All rights reserved.
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this site About Us Learn more about Stack Overflow the company Business ora-04091 after insert trigger Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask oracle after trigger Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign https://www.techonthenet.com/oracle/errors/ora04091.php up Table is mutating, trigger/function may not see it (stopping an average grade from dropping below 2.5) up vote 1 down vote favorite Here's the problem: Create a trigger that prevents any change to the taking relation that would drop the overall average grade in any particular class below 2.5. Note: This trigger is not intended to address the average GPA of any http://stackoverflow.com/questions/16182089/table-is-mutating-trigger-function-may-not-see-it-stopping-an-average-grade-fr given student, but rather it should address the average grade for all grades assigned in a particular class. Here's the schema: Student-schema =(studentnum, name, standing, gpa, major) Class-schema = (schedulenum, semester, department, classnum, days, time, place, enrollment) Instructor-schema = (name, department, office) Teaches-schema = (name, schedulenum, semester) Taking-schema = (studentnum, schedulenum, semester, grade) I'm having a terrible time with these triggers, but here's my attempt to make this work: CREATE OR REPLACE TRIGGER stopChange AFTER UPDATE OR INSERT OR DELETE ON taking REFERENCING OLD AS old NEW AS new FOR EACH ROW DECLARE grd_avg taking.grade%TYPE; BEGIN SELECT AVG(grade) INTO grd_avg FROM taking WHERE studentnum = :new.studentnum AND schedulenum = :new.schedulenum AND semester = :new.semester; IF grd_avg < 2.5 THEN UPDATE taking SET grade = :old.grade WHERE studentnum = :old.studentnum AND schedulenum = :old.schedulenum AND semester = :old.semester; END IF; END; / I'm obviously doing something wrong because when I then go to update or delete a tuple, I get the error: ERROR at line 1: ORA-04091: table TAKING is mutating, trigger/function may not see it ORA-06512: at "STOPCHANGE", line 6 ORA-04088: error during execution of trigger 'STOPCH
log in tour help Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you http://dba.stackexchange.com/questions/90052/error-in-trigger-table-x-is-mutating-trigger-function-may-not-see-it might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting https://decipherinfosys.wordpress.com/2009/06/22/mutating-tabletrigger-error-and-how-to-resolve-it/ ads with us Database Administrators Questions Tags Users Badges Unanswered Ask Question _ Database Administrators Stack Exchange is a question and answer site for database professionals who mutating trigger wish to improve their database skills and learn from others in the community. Join them; it only 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 Error in trigger: table X is mutating, trigger/function may not see ora-04091 table is it up vote 1 down vote favorite 1 Having looked at the following Trigger, still getting the Row 2 error: "ORA-04091: table SUMMITTEST.APL_LOG is mutating, trigger/function may not see it" Please can anyone provide any help in resolving this? create or replace TRIGGER SUMMITTEST.NEW_APP_TEST AFTER INSERT ON SUMMITTEST.APL_LOG FOR EACH ROW WHEN (new.APL_CO='01' or new.apl_co='40') BEGIN INSERT INTO SUMMITTEST.WEPALERT select 9, --EVENT_ID 1, --EVENT_NO SYSDATE(), --ACTION_DATE 'EVENTS', --ACTION_USER DECODE(JTT_EXTRA1,'','cjohnson300@hotmail.com',jtt_extra1), --COMM_X_1 '', --COMM_X_2 '', --COMM_X_3 '', --COMM_X_4 '', --COMM_X_5 '', --COMM_X_6 '', --COMM_X_7 '', --COMM_X_8 '', --COMM_MESSAGE '', --COMM_PRIORITY :new.APL_COMMENT, --COMM_SUBJECT :new.APL_CO, --X_REF_1 trim(substr(:new.apl_source_key,3,16)) || ' - ' || cla_name contract, --X_REF_2 to_char(:new.apl_value,'99,999,999.99') newnum, --X_REF_3 substr(:new.apl_source_key,-8,8) order2, --X_REF_4 decode(olr_url,'','','This is an amended order. To see the previously approved order, click'), --X_REF_5 decode(olr_url,'','',' here'), --X_REF_6 bxs_name, --X_REF_7 poh_pla_no2 || ' - ' || pla_name, --X_REF_8 to_char(poh_order_date, 'dd/mm/yyyy') order_date, --X_REF_9 :new.apl_value, --N_REF_1 :new.apl_co, --N_REF_2 0, --N_REF_3 0, --N_REF_4 0, --N_REF_5 0, --N_REF_6 0, --N_REF_7 0, --N_REF_8 0, --N_REF_9 SYSDATE(), --D_REF_1 SYSDATE(), --D_R
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