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dbms_parallel_execute tips 

Oracle Database Tips by Donald BurlesonFebruary 11, 2015

Question:  What does the dbms_parallel_execute DBMS package do?  When would I use dbms_parallel_execute instead of parallel DML?  Is it superior to parallel DML?
 
Answer:  No, the dbms_parallel_execute package (new in 11g r2) is not as easy to use as vanilla parallel DML, IMHO, because Oracle parallel query (and DML) reliably divides a table into equal-sized chunks automatically.  The dbms_parallel_execute package is for special cases of incremental bulk updates in PL/SQL.

It also appears that dbms_parallel_execute is a way to implement parallel query in Oracle Standard Ediition (SE).  parallel-processing-with-standard-edition

"As of Oracle Database 11g Release 2,there is a feature that provides parallel processing capabilities in the StandardEdition. This feature is available through the DBMS_PARALLEL_EXECUTE package."

Dr. Tim Hall  notes you should use this package only where straight parallel DML is not appropriate, such as when you are using parallel DML inside PL/SQL loops (such as incrementally bulk updating data). This do-it-yourself parallelism in dbms_parallel_execute can be used to manually specify the degree of parallelism to fully saturate a dedicated server and he notes the following steps for using the dbms_parallel_execute package:
 
1:  Create a task

2:  Split the workload into chunks

   exec dbms_parallel_execute.create_chunks_by_rowid
   exec dbms_parallel_execute.create_chunks_by_number_col
   exec dbms_parallel_execute.create_chunks_by_sql
 
3:  Run the task

   exec dbms_parallel_execute.run_task
   User-defined framework
   Task control
 
4:  Check the task status

5:  Drop the task
 
You can view the status of dbms_parallel_execute with this dictionary SQL against the dba_parallel_execute_chunks view:
 
select
   chunk_id,
   status,
   start_id,
   end_id
from  
   dba_parallel_execute_chunks
where 
   task_name = 'test_task'
order by
   chunk_id;

Here is a sample invocation of dbms_parallel_execute:

query_chunk_generator := 'SELECT ... '; --the statement to chunk
mystmt := ...; --the statement to be executed

DBMS_PARALLEL_EXECUTE.CREATE_TASK (parallel_task_name);

DBMS_PARALLEL_EXECUTE.CREATE_CHUNKS_BY_SQL (
  parallel_task_name,

  query_chunk_generator,
  true);

DBMS_PARALLEL_EXECUTE.RUN_TASK (
  parallel_task_name,

  mystmt,
  dbms_sql.NATIVE,
  parallel_level => 31);

   
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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

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