Parallel trick works not.
Hello
I'm trying to update a table using the parallel indicator but the plan of the explain command shows that the DML does not use the suspicion. I also changed my session to enable parallel DML - ALTER SESSION ACTIVATE PARALLEL DML.
-create the table script
drop table test_tab;
create the table test_tab
as
Select rownum num, session_id 'session ID value' of the double
connect by level < = 1000000;
-SQL statement
Update / * + PARALLEL(test_tab,4) * / test_tab
the value num = num/100, session_id is SYS_CONTEXT ('USERENV', 'SESSIONID');
-Plan to explain
-------------------------------------------------------------------------------
| ID | Operation | Name | Lines | Bytes | Cost (% CPU). Time |
-------------------------------------------------------------------------------
| 0 | UPDATE STATEMENT. | 920K | 29 M | 1130 (1) | 00:00:14 |
| 1. UPDATE | TEST_TAB | | | | |
| 2. TABLE ACCESS FULL | TEST_TAB | 920K | 29 M | 1130 (1) | 00:00:14 |
-------------------------------------------------------------------------------
-the values of parameter in parallel
SQL > show the parallel parameter
VALUE OF TYPE NAME
------------------------------------ ----------- --------
fast_start_parallel_rollback string LOW
parallel_adaptive_multi_user Boolean TRUE
parallel_automatic_tuning boolean FALSE
parallel_degree_limit string CPU
parallel_degree_policy chain MANUAL
parallel_execution_message_size integer 16384
parallel_force_local boolean FALSE
parallel_instance_group string
parallel_io_cap_enabled boolean FALSE
PARALLEL_MAX_SERVERS integer 4
parallel_min_percent integer 0
VALUE OF TYPE NAME
------------------------------------ ----------- --------
parallel_min_servers integer 0
parallel_min_time_threshold string AUTO
parallel_server boolean FALSE
parallel_server_instances integer 1
parallel_servers_target integer 128
parallel_threads_per_cpu integer 2
recovery_parallelism integer 0
-Database version
11.2.0.2.0
Can you tell me why the plan of the explain command indicates that the update operation is not spawning in multiple threads?
Thank you!
You are running Enterprise Edition?
PQ is not part of the Standard Edition
Concerning
Jonathan Lewis
Tags: Database
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