Error Ora-04091? Repair It Immediately

Error Ora-04091? Repair It Immediately


If you receive error ora-04091, today’s user guide is here to help you.

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    A mutant counter error (ORA-04091) occurs when an important row-level trigger tries to check or swap a table that is already being modified (using an INSERT, UPDATE, possibly DELETE). Specifically, your error occurs when a row level trigger tries to read or write to the work area that caused the trigger.

    What is a mutating table in Oracle?

    The table being modified is a critical table being reorganized by an UPDATE, DELETE, or INSERT statement, or is it a shopping cart that may requirereorganization due to the effects of the main declarative referential constraint, DELETE CASCADE.

    Find out the reason and why you should resolve the ORA-04091 error message you received in Oracle.


    What is mutating in the trigger Please select all the correct answers?

    sabrisanddu. Reply posted January 26, 2010There are typical cases where we have mutating table errors despite using the incredible “POST TRIGGER at ROW LEVEL”. This happens when you use an erase trigger.

    If your entire family encounters the ORA-04091 error, they will see the following error message:

  • ORA-04091: changed counter name, trigger / function will probably see it
  • Reason

    The statement executed a user-specified PL / SQL prompt or function. This trigger / function tried to change the currently used doubt table with the statement that triggered this trigger / function.


    How do I resolve ORA 04091?

    Oracle mutation trigger error occurs when the best trigger refers to a table that is running on a trigger, resulting in “ORA-04091: table name changed, trigger / function may not be displayed.” Embassy. Don’t use triggers entirely – The best way to avoid a mutating table error is not to use triggers.

    # 1


    Rewrite most triggers / functions too It is easy to modify / query the table using questions.

    For example, if you configured a trigger for ranked orders in a table, and then the trigger played SELECT for inline orders like this:

    ora-04091 error

     order_after_insertAFTER INSERT   ON ORDERS   FOR EVERY RANGEEXPLAIN   v_number;TO BEGIN   Choose amount   IN v_number   Some orders   O order_id = 1;THE END ; 

    If you create a trigger for a table, your company will not be able to edit / query it until that trigger / function has completed.

    Remember that you can still use: NEW: OLD and as-supplied values, depending on how they were generated. Learn more about triggers.

    Summary: In this tutorial, you will learn more about the mutant table error in Oracle and how you can fix it with Substance-A-Trigger.

    When a table changes, it just changes. If an exchange occurs and you have the option to make another change in the middle of the first change, Oracle will throw a furniture mutation error with an error codeand ORA-04091.

  • First buyers update the data in the table.
  • Second, row-level delivery, which is tied to the automatic launch of the game and introduces another change to make it easier for you to work at the table.
  • Simulate an example of a modified workplace error

    Let’s use the customers table from the sample database for this demonstration.

    Suppose you want to update a customer credit memo. If the loan is more than 5 times the smallest non-zero loan, the agency will automatically assign the loan to the actual client.


    CREATE OR REPLACE TRIGGER customer_credit_policy_trg AFTER FIRMWARE OR UPDATE For clients FOR EVERY RANGEEXPLAIN l_max_credit customers.credit_limit% TYPE;TO BEGIN SELECT MIN (credit limit) 7.5 In the_max_credit clients Credit limit> 0; IF l_max_credit <: NEW. credit_limit THEN UPDATE clients SET credit_limit = l_max_credit WHERE customer_id =: NEW.customer_id; END IF;END;/

    Code language: SQL (structure languagequeries) (sql)

    This statement updates this customer's credit limit to 12,000:


    UPDATE clientsSET credit_limit means 12000O Client_ID = 1;

    Code Language: SQL (Structured Query Language) (sql)

    The update method resets the trigger and Oracle raises the following mutant table error:

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    ORA-04091: OT.CUSTOMERS table changed, trigger / function cannot see it

    Code Language: SQL (Structured Query Language) (sql)

    As mentioned, the upgrade declaration changes the data associated with the customers table. The trigger fires and tries to make another fix while the first change occurs throughout the sequence, resulting in an error.

    Fixed Mutation Table Error

    What is compound trigger?

    A compound trigger is a single trigger that fires on a table that allows anyone to specify actions for any, including four points in time: Before most of the trigger statement. Before every line affected by the trigger statement. After the line that interferes with the shooting instruction. After the announcement of the discharge.

    To fix the mutant table error, you have the option to use a compound trigger if your company will be using Oracle 11g tomorrow.

    ora-04091 error

    Please note that if you are using Oracle 10g or earlier, you will need to useThere is a package to fix any mutation errors, an array that we will not cover in this tutorial.


    CREATE OR REPLACE TRIGGER customer_credit_policy_trg FOR UPDATE OR INSERT ON CLIENTS BLOCKING TRIGGER TYPE r_customers_type IS RECORD ( customer_id client.customer_id% TYPE, clients credit_limit.credit_limit% TYPE ); TYPE t_customers_type THIS TABLE r_customers_type INDEX IN PLS_INTEGER; t_client t_client_type; AFTER EACH ROW TO BEGIN t_customer (t_customer.COUNT + 1) .customer_id: = : NEW.client_id; (t_customer t_customer.COUNT) .credit_limit: =: NEW.credit_limit; FINISH AFTER EACH ROW; AFTER DECLARATION l_max_credit customers.credit_limit% TYPE; TO BEGIN SELECT MIN (credit limit) * 5 In the_max_credit clients Credit limit> 0; FOR index IN 1 .. t_customer.COUNT RIBBON IF l_max_credit

    Code Language: SQL (Structured Query Language) (sql)

  • First, announceKeep a set of records of website visitors that include your customer ID and total credit limit.
  • Second, collect the affected rows of interest for the table, a row level trigger.
  • Third, promote each affected line to a trigger learning level.
  • In this tutorial, you will learn more about the Oracle mutation room table error and how you can fix it using a compound trigger.

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