Q

Resolving an ORA-04091 error

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Why does this code cause an ORA-04091 error?

load data
infile *
append into table sql_parent
(
	parent_id "CreateNewRollId",
	parent_char  POSITION(1)  CHAR(4),
	parent_value POSITION(5)  CHAR(6)
)
BEGINDATA
c2  v2
c333v333

//function: CreateNewRollId
//
create or replace function CreateNewRollId
RETURN NUMBER
IS
roll_max_id NUMBER(38);
roll_id NUMBER(38);
BEGIN
	select MAX(parent_id) into roll_id from sql_parent;
	roll_max_id := GREATEST(roll_id, NVL(roll_max_id,0))+1;
	RETURN (roll_max_id);
END;
/


The SQLLOAD command inserts data into the sql_parent table. The SQLLOAD uses a stored function called CreateNewRollId that does a SELECT operation on the same table.

You also have a trigger on the insert event of the table. (It's not written, but check that you have such a trigger; 4091 is a specific error message that involves triggers.)

The SQLLOAD command fires the insert and then the trigger works in conjunction with the stored function. It causes a mutation because when you started the insert row, you cannnot do a DML operaion on the SAME table until the insert row completes. To resolve the situation, disable the insert trigger. Do the SQLLOAD statement, and then do the code inside the trigger definition.

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This was first published in February 2002

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