Parallel not working
Hi All,
I have one package with around 15 procedures. When I run it in the schema who owns the package, it doesn't run in parallel but when I run the same in other schema the same package use parallel process for the execution. If the package runs serially, total execution time is around 40 mins and if it uses parallel process, total execution time is 12 mins.
This package also contains
Alter session enable parallel query;
Alter session enable parallel dml;
Please let me know if you have any idea, why this is happening?
Thanks,
Api
user12263759 wrote:
I have one package with around 15 procedures. When I run it in the schema who owns the package, it doesn't run in parallel but when I run the same in other schema the same package use parallel process for the execution. PL/SQL code (as in a package), does not run in parallel via the PQ (<i>Parallel Query</i>) feature. Only certain SQL statements, that qualify for PQ processing, do.
If the package runs serially, total execution time is around 40 mins and if it uses parallel process, total execution time is 12 mins.Measuring elapsed execution time is meaningless, without know exactly what workload you are measuring. Even the very same SQL statement, on the same table, with the same execution plan, hitting the same number of rows, can have different elapsed execution times.
So if the same SQL statement can have different execution times, how meaningful is your quote of 40 min vs. 12 min. execution times? Not meaningful at all as there is no baseline for comparing the workloads done.
Please let me know if you have any idea, why this is happening?Oracle version? O/s version? What SQLs do you see are running in parallel? How do you determine that? What are the parallel degrees (and instances if RAC)? Does the PL/SQL code run with definer or current user rights? When executed as a another schema, what privs does this schema has on the package and the objects it is using? (are there context/VPDB features used, FGAC, etc?)
Observing a symptom as you have described is just that - a symptom. It needs a lot more questions asked and answered and analysis, in order to diagnose the root cause.
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Plan hash value: 2296199318
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| 0 | SELECT STATEMENT | | 1 | 130 | 3713 (0)| 00:00:45 | | | | | |
| 1 | SORT AGGREGATE | | 1 | 2 | | | | | | | |
| 2 | XPATH EVALUATION | | | | | | | | | | |
| 3 | PX COORDINATOR | | | | | | | | | | |
| 4 | PX SEND QC (RANDOM) | :TQ10000 | 1 | 130 | 3713 (0)| 00:00:45 | | | Q1,00 | P->S | QC (RAND) |
| 5 | NESTED LOOPS | | 1 | 130 | 3713 (0)| 00:00:45 | | | Q1,00 | PCWP | |
| 6 | NESTED LOOPS | | 1 | 128 | 3683 (0)| 00:00:45 | | | Q1,00 | PCWP | |
| 7 | PX BLOCK ITERATOR | | 1 | 108 | 3683 (0)| 00:00:45 | 1 | 63 | Q1,00 | PCWC | |
|* 8 | TABLE ACCESS FULL | NADS | 1 | 108 | 3683 (0)| 00:00:45 | 1 | 63 | Q1,00 | PCWP | |
|* 9 | TABLE ACCESS BY INDEX ROWID| METAS | 1 | 20 | 2 (0)| 00:00:01 | | | Q1,00 | PCWP | |
|* 10 | INDEX UNIQUE SCAN | MET_NADS_ID_TYPE_ID_UK | 1 | | 1 (0)| 00:00:01 | | | Q1,00 | PCWP | |
| 11 | XPATH EVALUATION | | | | | | | | Q1,00 | PCWP | |
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8 - filter("OWNING_ORI"='ABC123' AND "NAT_SOURCE_ID"=0 AND "STATUS_ID"=1)
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| 0 | SELECT STATEMENT | | 1 | 130 | 3713 (0)| 00:00:45 | | |
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| 4 | SORT AGGREGATE | | 1 | 130 | | | | |
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| 6 | NESTED LOOPS | | 1 | 128 | 3683 (0)| 00:00:45 | | |
| 7 | PARTITION LIST ALL | | 1 | 108 | 3683 (0)| 00:00:45 | 1 | 63 |
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Edited by: drad on May 9, 2012 3:31 AMAfter adding the no_xml_query_rewrite hint I get the PX Coordinator back and parallel processing is enabled; however, this comes at a significant performance impact (query takes 2-3 times longer). It currently appears that Parallel is not worth the cost of loosing the xml query rewrite unless a different indexing scheme can make up the difference.
Apparently the issue was the optimizer rewriting the xml query in the XMLTable which was causing Parallel processing to not be used.
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x458s37 NUMBER PATH 'count(Location/FullStreetAddress)',
x459s38 NUMBER PATH 'count(Location/State)',
x460s39 NUMBER PATH 'count(Location/StreetName)',
x461s40 NUMBER PATH 'count(Location/StreetNumber)',
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AND NAT_SOURCE_ID=0
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and n.id=met.nads_id and met.type_id=mtt.id and mtt.name='ReportType' and met.val='Arrest Report';Edited by: drad on May 15, 2012 6:03 AM
Edited by: drad on May 15, 2012 6:04 AM
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INSERT INTO TABLE1
SELECT column1, column2
FROM table2;
I modified the query so that it has a parallel:
SELECT /*+ FULL(table2) PARALLEL(table2, 4) */
column1, column2
FROM table2;
This parallel helps with the query's speed. However, when I use it with the insert statement on the top, it does not insert any record, nor does it give an error message:
INSERT INTO TABLE1
SELECT /*+ FULL(table2) PARALLEL(table2, 4) */
column1, column2
FROM table2;
I put EXECUTE IMMEDIATE 'ALTER SESSION ENABLE PARALLEL DML'; at the beginning of the procedure, but that did not help.
I really need the parallel to be in the SELECT statement, that statement runs for about 3 hours without a parallel (due to large amounts of data - no problems with query itself), however it returns only about 10,000 records, and I don't need to insert those with a parallel hint.
Edited by: user577453 on Mar 17, 2009 12:25 PM -- Added last paragraph.user577453 wrote:
I think that I am misusing the parallel hint on this one, and would appreciate some guidance. I have an insert statement as such:
I put EXECUTE IMMEDIATE 'ALTER SESSION ENABLE PARALLEL DML'; at the beginning of the procedure, but that did not help.
I really need the parallel to be in the SELECT statement, that statement runs for about 3 hours without a parallel (due to large amounts of data - no problems with query itself), however it returns only about 10,000 records, and I don't need to insert those with a parallel hint.First of all, your subject is probably supposed to be "Parallel hint as part of *insert* not working" rather than "Parallel hint as part of *index* not working", am I right?
Can you show us the EXPLAIN PLAN output you get for your query and the one you get for your INSERT when using the parallel hints as posted?
Please mention your database version (4-digits, e.g. 10.2.0.3).
Please use DBMS_XPLAN.DISPLAY to format the EXPLAIN PLAN output if you're already on 9i or later, and please use the \ tag before and after the DISPLAY output to format it in fixed font for readability.
What seems to be odd that you say that the result of the query seems to be different when using it as part of the INSERT statement? Are you sure that running the query standalone returns data whereas using exactly the same query in the INSERT statement inserts no records? This would be buggy behaviour.
Regards,
Randolf
Oracle related stuff blog:
http://oracle-randolf.blogspot.com/
SQLTools++ for Oracle (Open source Oracle GUI for Windows):
http://www.sqltools-plusplus.org:7676/
http://sourceforge.net/projects/sqlt-pp/ -
DBMS_DATAPUMP parallel parameter did not work
Hi, I am using DBMS_DATADUMP with network link to load large table directly from one database to another database. I used parallel parameter to improve the performance. But looks the parallel did not work. Still only one worker to handle the import.
The status is
Job: LOADING
Owner: TRI
Operation: IMPORT
Creator Privs: TRUE
GUID: 25DB4B2BE420406B82A7AE159CF1E626
Start Time: Wednesday, 22 April, 2009 15:37:04
Mode: TABLE
Instance: orcl
Max Parallelism: 4
EXPORT Job Parameters:
IMPORT Job Parameters:
Parameter Name Parameter Value:
INCLUDE_METADATA 0
TABLE_EXISTS_ACTION TRUNCATE
State: EXECUTING
Bytes Processed: 0
Current Parallelism: 4
Job Error Count: 0
Worker 1 Status:
Process Name: DW01
State: EXECUTING
Object Schema: TRI
Object Name: ORDER_LINES
Object Type: TABLE_EXPORT/TABLE/TABLE_DATA
Completed Objects: 1
Total Objects: 1
Worker Parallelism: 1
Worker 2 Status:
Process Name: DW02
State: WORK WAITING
My source database is 10.2.0.4 compatible=10.2.0
target database is 11.1.0.6
My table is around 3G
The API I am using is
my_handle := dbms_datapump.open(operation => 'IMPORT',job_mode => 'TABLE',
remote_link => my_db_link, job_name => my_job_name ,version=>'LATEST' ) ;
dbms_datapump.set_parameter (my_handle, 'TABLE_EXISTS_ACTION','TRUNCATE');
dbms_datapump.set_parameter (my_handle, 'INCLUDE_METADATA',0);
dbms_datapump.metadata_filter (handle => my_handle, name => 'SCHEMA_EXPR',
value=>'IN (''ORDER'')');
dbms_datapump.metadata_filter (handle => my_handle, name => 'NAME_LIST',
value => '''ORDER_LINES''');
dbms_datapump.metadata_remap(my_handle,'REMAP_SCHEMA',old_value=>'ORDER',value=>'TRI');
dbms_datapump.set_parallel(my_handle,16);
dbms_datapump.start_job(my_handle);
Edited by: tonym on Apr 23, 2009 10:49 AMThen I test to use API and network link to export large table from remote database with parallel parameter.
my_handle := dbms_datapump.open(operation => 'EXPORT',job_mode => 'TABLE',remote_link => my_db_link, job_name => my_job_name ,version=>'LATEST' ) ;
DBMS_DATAPUMP.add_file( handle => my_handle, filename => 'test1.dmp', directory => 'DATA_PUMP_DIR');
DBMS_DATAPUMP.add_file( handle => my_handle, filename => 'test2.dmp', directory => 'DATA_PUMP_DIR');
DBMS_DATAPUMP.add_file( handle => my_handle, filename => 'test3.dmp', directory => 'DATA_PUMP_DIR');
DBMS_DATAPUMP.add_file( handle => my_handle, filename => 'test4.dmp', directory => 'DATA_PUMP_DIR');
dbms_datapump.metadata_filter (handle => my_handle, name => 'SCHEMA_EXPR',value=>'IN (''INVENTORY'')');
dbms_datapump.metadata_filter (handle => my_handle, name => 'NAME_LIST',value => '''INV_TRANSACTIONS''');
dbms_datapump.set_parallel(my_handle,4);
dbms_datapump.start_job(my_handle);
Looks it did not use parallel either. This table is around 3G too.
status:
Job: LOADING_2
Operation: EXPORT
Mode: TABLE
State: EXECUTING
Bytes Processed: 0
Current Parallelism: 4
Job Error Count: 0
Dump File: C:\ORACLE\ADMIN\OW\DPDUMP\TEST1.DMP
bytes written: 69,632
Dump File: C:\ORACLE\ADMIN\OW\DPDUMP\TEST2.DMP
bytes written: 4,096
Dump File: C:\ORACLE\ADMIN\OW\DPDUMP\TEST3.DMP
bytes written: 4,096
Dump File: C:\ORACLE\ADMIN\OW\DPDUMP\TEST4.DMP
bytes written: 4,096
Worker 1 Status:
Process Name: DW04
State: WORK WAITING
Worker 2 Status:
Process Name: DW05
State: EXECUTING
Object Schema: INVENTORY
Object Name: INV_TRANSACTIONS
Object Type: TABLE_EXPORT/TABLE/TABLE_DATA
Completed Objects: 1
Total Objects: 1
Completed Rows: 4,652,330
Worker Parallelism: 1
Edited by: tonym on Apr 23, 2009 10:53 AM -
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I find no notes on this either on the Parallels site or here. Am i the only one in the universe having this problem. To be clear, there is no response from the pad whatever - nada, bupkis.
Maybe I have to pair it manually with Windows? That seems odd since everything else works fine that is connected to the iMac.
Tips, hunches, soothing words?
Thanks!If you downloaded and installed the Windows support software in accordance with the instructions, you now have a diamond shaped icon in the Windows task bar. Clicking this icon opens the Bootcamp control panel where all your trackpad settings can be configured.
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