Dbms_Parallel_Execute run as a Dbms_Scheduler job

Question

Hi,
I have tried to use Dbms_Parallel_Execute to update a column in different tables.
This works fine when I run it from SQLPlus or similar.
But if I try to run the code as a background job using Dbms_Scheduler it hangs on the procedure Dbms_Parallel_Execute.Run_Task.
The session seems to hang forever.
If I kill the session of the background job, the task ends up in state FINISHED and the update has been completed.
If I look on the session it seems to be waiting for event "pl/sql lock timer".
Anyone who knows what can go wrong when running this code as a background job using Dbms_Scheduler?
Code example:
CREATE OR REPLACE PROCEDURE Execute_Task___ (
table_name_ IN VARCHAR2,
stmt_ IN VARCHAR2,
chunk_size_ IN NUMBER DEFAULT 10000,
parallel_level_ IN NUMBER DEFAULT 10 )
IS
task_ VARCHAR2(30) := Dbms_Parallel_Execute.Generate_Task_Name;
status_ NUMBER;
error_occurred EXCEPTION;
BEGIN
Dbms_Parallel_Execute.Create_Task(task_name => task_);
Dbms_Parallel_Execute.Create_Chunks_By_Rowid(task_name => task_,
table_owner => Fnd_Session_API.Get_App_Owner,
table_name => table_name_,
by_row => TRUE,
chunk_size => chunk_size_);
-- Example statement
-- stmt_ := 'UPDATE Test_TAB SET rowkey = sys_guid() WHERE rowkey IS NULL AND rowid BETWEEN :start_id AND :end_id';
Dbms_Parallel_Execute.Run_Task(task_name => task_,
sql_stmt => stmt_,
language_flag => Dbms_Sql.NATIVE,
parallel_level => parallel_level_);
status_ := Dbms_Parallel_Execute.Task_Status(task_);
IF (status_ IN (Dbms_Parallel_Execute.FINISHED_WITH_ERROR, Dbms_Parallel_Execute.CRASHED)) THEN
Dbms_Parallel_Execute.Resume_Task(task_);
status_ := Dbms_Parallel_Execute.Task_Status(task_);
END IF;
Dbms_Parallel_Execute.Drop_Task(task_);
EXCEPTION
WHEN OTHERS THEN
Dbms_Parallel_Execute.Drop_Task(task_);
RAISE;
END Execute_Task___;

Answer 1

Hi,
Check job_queue_processes parameter, it must be greater than 0.