How to execute DML in an Oracle trigger with EXECUTE IMMEDIATE

Is it possible to create an index within a trigger? I have to do that because to optimize my process I need an additional index on a table (that is created on the fly by another product). If the index doesn't exist, I create it. Last time I tried it I got a message that the DML is not authorized in the trigger.

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You can execute DML in a trigger if that DML is part of the EXECUTE IMMEDIATE statement similar to the following: 

CREATE TRIGGER my_trig 
….
BEGIN
   Stmt := 'CREATE INDEX my_index ON my_table(column)';
   EXECUTE IMMEDIATE Stmt;
END;
/

This was first published in November 2009

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