How to force a parallel dml?

I have a DB 11g r2, and I use parallel queries (parallel delete) for some huge tables.
But, sometimes queries just don't want to go parallel..
to force parallelism, I use hint /*+ parallel(table_name, no_of_parallel_procs, no_of_instances) */ .-.. some_sql_condition..
note that same query works fine in some enviroments, so there's no error in sql hint, and there's no background processes (AFAIK)
db init parameters are:
parallel_degree_limit=cpu
parallel_degree_policy=manual
parallel_max_servers=20
parallel_server=false
parallel_threads_per_cpu=2
I could provide more database parameters if necessary.

Slave processes, which are required for DML, could be in use at the time of the DML running;
while the DELETE is executing, open another session and run the following:
select slave_name
,status, cpu_secs_total
from v$pq_slave;If this figure appears too low or no rows are returned then PARALLEL mode will not occur.

Similar Messages

How to make Auto Parallelism work?

Hello,
We are running Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production. We have upgraded from 11gR1 recently. We are building a data warehouse in the instance of Oracle I am writing about. Heretofore we had been using hints in queries to take advantage of parallelism. We were hoping to achieve a performance boost by using the new "automatic degree of parallelism" support in 11gR2, but are having some problems understanding how to use it properly. From reading the Oracle white paper on parallelism http://www.oracle.com/us/products/database/twp-parallel-execution-fundamentals-133639.pdf , we had thought that by setting the database initialization parameters properly, and removing the query-level hints, and removing the parallel specifications in the table declarations, that Oracle would automatically determine the correct level of parallelism, and apply it. Instead, we have found that the removal of the hints and declarations results in a single-thread execution for our data-load queries, which load 100s of millions of rows, involving joins among tables that each contain more than 90 million rows. Reapplying the hints significantly improves our throughput. During the time we are running the data loads, the data load is the only significant user on our system, and our goal is to complete execution as quickly as possible.
The PLSQL packages that load the data issue a "ALTER SESSION ENABLE PARALLEL DML " before running the loads.
Here are our database initialization parameter settings that relate to parallelism:
NAME TYPE VALUE
fast_start_parallel_rollback string LOW
parallel_adaptive_multi_user boolean FALSE
parallel_automatic_tuning boolean FALSE
parallel_degree_limit string CPU
parallel_degree_policy string AUTO
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 128
parallel_min_percent integer 0
parallel_min_servers integer 8
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 4
Any help you can provide to help us use parallelism more effectively in 11gR2 would be gratefully appreciated.

One common mistake is to not run the IO CALIBRATE before enabling AUTODOP=AUTO
you may need to tweak this value or set it manually to something like (0,200,...) -- Check MOS for more on this
this requires a bounce of all instancesAlso: there are thresholds that need to be surpassed:
.e.g the default 10 seconds for parallel_min_time_threshold would suppress parallelism attempts for shorter queries vs. longer
If default load has thousand of short queries this may not be the parameter for you: However you can decrease the threshold to a lower value
such as 5 seconds or less.
EM is a good place to monitor parallelism in real time ( or historically)
- You might consider testing and reviewing if the above is relevant
Last- Trace files including 10046 or 10053 should show AUTODOP being used
- If this is LIMITED but the parameter is AUTO, you probably have no io calibrate stats
Take care
CL

Oracle 11.2 - Perform parallel DML on a non partitioned table with LOB column

Hi,
Since I wanted to demonstrate new Oracle 12c enhancements on SecureFiles, I tried to use PDML statements on a non partitioned table with LOB column, in both Oracle 11g and Oracle 12c releases. The Oracle 11.2 SecureFiles and Large Objects Developer's Guide of January 2013 clearly says:
Parallel execution of the following DML operations on tables with LOB columns is supported. These operations run in parallel execution mode only when performed on a partitioned table. DML statements on non-partitioned tables with LOB columns continue to execute in serial execution mode.
INSERT AS SELECT
CREATE TABLE AS SELECT
DELETE
UPDATE
MERGE (conditional UPDATE and INSERT)
Multi-table INSERT
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SQL> CREATE TABLE T1 (A BLOB);
Table created.
Then, I tried to see the execution plan of a parallel DELETE:
SQL> EXPLAIN PLAN FOR
2 delete /*+parallel (t1,8) */ from t1;
Explained.
SQL> select * from table(dbms_xplan.display);
PLAN_TABLE_OUTPUT
Plan hash value: 3718066193
| Id | Operation             | Name     | Rows | Cost (%CPU)| Time     |    TQ |IN-OUT| PQ Distrib |
|   0 | DELETE STATEMENT      |          | 2048 |     2   (0)| 00:00:01 |        |      |            |
|   1 | DELETE               | T1       |       |            |          |        |      |            |
|   2 |   PX COORDINATOR      |          |       |            |          |        |      |            |
|   3 |    PX SEND QC (RANDOM)| :TQ10000 | 2048 |     2   (0)| 00:00:01 | Q1,00 | P->S | QC (RAND) |
|   4 |     PX BLOCK ITERATOR |          | 2048 |     2   (0)| 00:00:01 | Q1,00 | PCWC |            |
|   5 |      TABLE ACCESS FULL| T1       | 2048 |     2   (0)| 00:00:01 | Q1,00 | PCWP |            |
PLAN_TABLE_OUTPUT
Note
   - dynamic sampling used for this statement (level=2)
And I finished by executing the statement.
SQL> commit;
Commit complete.
SQL> alter session enable parallel dml;
Session altered.
SQL> delete /*+parallel (t1,8) */ from t1;
2048 rows deleted.
As we can see, the statement has been run as parallel:
SQL> select * from v$pq_sesstat;
STATISTIC                      LAST_QUERY SESSION_TOTAL
Queries Parallelized                    1             1
DML Parallelized                        0             0
DDL Parallelized                        0             0
DFO Trees                               1             1
Server Threads                          5             0
Allocation Height                       5             0
Allocation Width                        1             0
Local Msgs Sent                        55            55
Distr Msgs Sent                         0             0
Local Msgs Recv'd                      55            55
Distr Msgs Recv'd                       0             0
11 rows selected.
Is it normal ? It is not supposed to be supported on Oracle 11g with non-partitioned table containing LOB column....
Thank you for your help.
Michael

Yes I did it. I tried with force parallel dml, and that is the results on my 12c DB, with the non partitionned and SecureFiles LOB column.
SQL> explain plan for delete from t1;
Explained.
| Id | Operation             | Name     | Rows | Cost (%CPU)| Time     |    TQ |IN-OUT| PQ Distrib |
|   0 | DELETE STATEMENT      |          |     4 |     2   (0)| 00:00:01 |        |      |            |
|   1 | DELETE               | T1       |       |            |          |        |      |            |
|   2 |   PX COORDINATOR      |          |       |            |          |        |      |            |
|   3 |    PX SEND QC (RANDOM)| :TQ10000 |     4 |     2   (0)| 00:00:01 | Q1,00 | P->S | QC (RAND) |
|   4 |     PX BLOCK ITERATOR |          |     4 |     2   (0)| 00:00:01 | Q1,00 | PCWC |            |
|   5 |      TABLE ACCESS FULL| T1       |     4 |     2   (0)| 00:00:01 | Q1,00 | PCWP |            |
The DELETE is not performed in Parallel.
I tried with another statement :
SQL> explain plan for
2        insert into t1 select * from t1;
Here are the results:
11g
| Id | Operation                | Name     | Rows | Bytes | Cost (%CPU)| Time     |    TQ |IN-OUT| PQ Distrib |
|   0 | INSERT STATEMENT         |          |     4 | 8008 |     2   (0)| 00:00:01 |        |      |            |
|   1 | LOAD TABLE CONVENTIONAL | T1       |       |       |            |          |        |      |            |
|   2 |   PX COORDINATOR         |          |       |       |            |          |        |      |            |
|   3 |    PX SEND QC (RANDOM)   | :TQ10000 |     4 | 8008 |     2   (0)| 00:00:01 | Q1,00 | P->S | QC (RAND) |
|   4 |     PX BLOCK ITERATOR    |          |     4 | 8008 |     2   (0)| 00:00:01 | Q1,00 | PCWC |            |
|   5 |      TABLE ACCESS FULL   | T1       |     4 | 8008 |     2   (0)| 00:00:01 | Q1,00 | PCWP |            |
12c
| Id | Operation                          | Name     | Rows | Bytes | Cost (%CPU)| Time     |    TQ |IN-OUT| PQ Distrib |
|   0 | INSERT STATEMENT                   |          |     4 | 8008 |     2   (0)| 00:00:01 |        |      |            |
|   1 | PX COORDINATOR                    |          |       |       |            |          |        |      |            |
|   2 |   PX SEND QC (RANDOM)              | :TQ10000 |     4 | 8008 |     2   (0)| 00:00:01 | Q1,00 | P->S | QC (RAND) |
|   3 |    LOAD AS SELECT                  | T1       |       |       |            |          | Q1,00 | PCWP |            |
|   4 |     OPTIMIZER STATISTICS GATHERING |          |     4 | 8008 |     2   (0)| 00:00:01 | Q1,00 | PCWP |            |
|   5 |      PX BLOCK ITERATOR             |          |     4 | 8008 |     2   (0)| 00:00:01 | Q1,00 | PCWC |            |
It seems that the DELETE statement has problems but not the INSERT AS SELECT !

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myList.Update();
web.AllowUnsafeUpdates = false;
so can you advice please ? is this a caching problem, or once the user add at-least single item he will be able to see all columns ?

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