Parallel DML may be downgraded to the DML series?

Similar Questions

• Why this parallel DML statement is not run as fast as DBMS_PARALLEL_EXECUTE?

  Hello

  I'm on the database Oracle Enterprise Edition, Linux RH 11.2.0.3. I have a pl/sql function that accepts a sdo_geometry (essentially an object with a few varrays), round each number in one of the varrays and retransmits the object.  Here is a version of the function, simplified slightly for brevity:

  create or replace round_coordinates (p_geometry in sdo_geometry, p_round_factor in numbers)

  return sdo_geometry parallel_enable

  is

  sdo_geometry v_geometry: = p_geometry;

  v_ordinates sdo_ordinate_array;

  Start

  v_ordinates: = p_geometry.sdo_ordinates;

  for me in v_ordinates.first... loop of v_ordinates. Last

  v_ordinates (i): = round (v_ordinates (i), p_round_factor);

  end loop;

  Return sdo_geometry (v_geometry.sdo_gtype, v_geometry.sdo_srid, v_geometry.sdo_point, v_geometry.sdo_elem_info, v_ordinates);

  end round_coordinates;

  /

  I need to perform this function as an update DML on hundreds of millions of sdo_geometry objects and according to my estimates it will take weeks.  So, I want to run in parallel.

  The data is in a bunch of tables, some with lines of k ~ 100 more with millions of people.  My preference is to browse the tables and run an update such as:

  Update < table > set geometry = round_coordinates (geometry);

  But I would like to operate in parallel, so I thought that I would allow the DML parallel to the session with

  ALTER session enable parallel dml.

  ALTER table < table > parallel;

  , and then run the update by: Update / * + parallel * / < table > set geometry = round_coordinates (geometry);

  When I do that, I can see a v$ px_session 16 parallel slaves are bent and the plan of the explanation is the following:
  

  ------------------------------------------------------------------------------------------------------------------

  | ID | Operation | Name | Lines | Bytes | Cost (% CPU). Time |    TQ | IN-OUT | PQ Distrib.

  ------------------------------------------------------------------------------------------------------------------

  |   0 | UPDATE STATEMENT.             | 10000 |   468K |    43 (0) | 00:00:01 |        |      |            |

  |   1.  UPDATE | SMALL_10000 |       |       |            |          |        |      |            |

  |   2.   COORDINATOR OF PX |             |       |       |            |          |        |      |            |

  |   3.    PX SEND QC (RANDOM). : TQ10000 | 10000 |   468K |    43 (0) | 00:00:01 |  Q1 00 | P > S | QC (RAND) |

  |   4.     ITERATOR BLOCK PX |             | 10000 |   468K |    43 (0) | 00:00:01 |  Q1 00 | ISSUE |            |

  |   5.      TABLE ACCESS FULL | SMALL_10000 | 10000 |   468K |    43 (0) | 00:00:01 |  Q1 00 | SVCP |            |

  ------------------------------------------------------------------------------------------------------------------

  But the update statement on my test data set does not any more quickly - it takes a few seconds more series that suggests General fresh extra expectations for the management of parallel slaves that's happened, but they did not have the query run faster.

  
  I tried to use the dbms_parallel_execute with the create_chunks_by_rowid option package and parallel_level = 16 With that I get at the end just over 1/16th of the time that it takes to run in series!

  That's fine, so I have the option dbms_parallel_execute, but I would like to understand why the query with the parallel flag does not expedite things.

  Any ideas?

  Thank you

  John

  It may be that the call to the PL/SQL function slows down things. Did you think to do in pure SQL?

  Here is an example:

  update test_sdo tsd
     set tsd.geometry.sdo_ordinates =
         (select cast(collect(round(t2.column_value)) as sdo_ordinate_array)
            from test_sdo t1
                ,table(t1.geometry.sdo_ordinates) t2
           where t1.id = tsd.id)
  

  Post edited by: PaulHorth

  BTW: You can parallelize the query part of the SQL but not updating, it's documentation:

  "Parallel DML can be done on tables with columns object provided that the columns of the object are not accessible."

• Running in parallel DML not forced

  Hello

  I work with an Oracle RDBMS 12cR1,

  I amcurrently how can I influence parallel experimentation DML and parallel DDL (for example edit.

  For example, I have the following settings:

  parallel_degree_level = 100

  parallel_degree_limit = CPU

  parallel_degree_policy = MANUAL

  These are the default values.

  At this point, that means I should be able to influence the optimier through tips.

  There is no statistics on the table I want to insert data.

  I started with:

  ALTER session force parallel dml parallel 4;

  Then I have an insert of type:

  insert into table (list of aliases for column using the dbms_random package)

  Select (column list) of the double

  connect by level < = 100000;

  When I followed the execution using EM, I don't see the parallel expected excution.

  The execution plan looks like this:

  CREATE statement

  load in select

  the gathering optimizer statistics

  connect to without filtering

  double quick

  This isn't a 'great' table and select to insert is not "big".

  If because I have such a '' big, '' set that Oracle chooses not to use parallel DML had?

  How can I force parallel DML execution?

  Thanks and greetings

  Laury wrote:

  Yes, after some further tests, I discovered that connection by does not allow for parallel processing.

  Yet, I do not observe the same kind of results as you.

  Think about how a connect works by, and it must be clear that it would be very difficult to implement a parallel connection by - especially when the driving table has only one row. But you don't really want to use a simple connect by to generate a large amount of data because of the impact this can have on memory.

  Once you've worked out why you do not get the parallelism you should be found - your parallel functions ARE enabled? Your parallel_max_servers is not null (you keep do not answer the question on parallel settings)-you can introduce the strategy who joined a small "connect by" result set to itself and you give the complete end parallelism you need:

  Insert / * + parallel (second_emp, 6) * / into second_emp

  (

  EmpNo,

  Ename,

  employment,

  Bishop.

  HireDate,

  SAL,

  Comm,

  DEPTNO

  )

  with generator as)

  Select

  rownum id

  Of

  Double

  connect

  level<=>

  )

  Select

  round (dbms_random.value (1: 500000)) like empno,

  dbms_random. String name ('U', 10),

  random_job as job,

  random_mgr as Bishop,

  trunc ((sysdate-1000) + dbms_random.value (0.366)) as hiredate.

  round (dbms_random.value (800, 300)) as sal,

  -decode (rounds (dbms_random.value (0, 1401)), 1401, null, rounds (dbms_random.value (0, 1401))) as comm

  (

  case

  When ((dbms_random.value (0, 1401)) round between 1000 and 1401)

  then null

  another round (dbms_random.value (0, 1401))

  end

  ) as Comm.,

  TO_NUMBER ((substr (round (dbms_random.value (10, 30)), 1, 1) |)) '0')) as deptno

  Of

  (select 1 n2 of the generator where id)<= 100)   ="">

  (select 1 n2 of the generator where id)<= 1000)  ="">

  ;

  Note in particular the subquery WITH which will generate a small TWG internally; then the join between two copies of this table - and this join does not use the rownum or operator LEVEL. This gives you a merge join parallel that generates a large amount of data and allows the PX servers make all calls to dbms_random.

  ----------------------------------------------------------------------------------------------------------------------------------------------

  | ID | Operation | Name                      | Lines | Bytes | Cost (% CPU). Time |    TQ | IN-OUT | PQ Distrib.

  ----------------------------------------------------------------------------------------------------------------------------------------------

  |   0 | INSERT STATEMENT.                           |       |       |     7 (100) |          |        |      |            |

  |   1.  TRANSFORMATION OF THE TEMPORARY TABLE.                           |       |       |            |          |        |      |            |

  |   2.   LOAD SELECT ACE |                           |       |       |            |          |        |      |            |

  |   3.    COUNT                            |                           |       |       |            |          |        |      |            |

  |   4.     CONNECT TO WITHOUT FILTERING.                           |       |       |            |          |        |      |            |

  |   5.      QUICK DOUBLE |                           |     1.       |     2 (0) | 00:00:01 |        |      |            |

  |   6.   COORDINATOR OF PX |                           |       |       |            |          |        |      |            |

  |   7.    PX SEND QC (RANDOM). : TQ10001 |     1.    26.     5 (0) | 00:00:01 |  Q1, 01 | P-> S | QC (RAND) |

  |   8.     LOAD SELECT ACE (HYBRID TSM/HWMB) |                           |       |       |            |          |  Q1, 01 | SVCP |            |

  |   9.      OPTIMIZER STATISTICS COLLECTION |                           |     1.    26.     5 (0) | 00:00:01 |  Q1, 01 | SVCP |            |

  |  10.       THE CARTESIAN MERGE JOIN.                           |     1.    26.     5 (0) | 00:00:01 |  Q1, 01 | SVCP |            |

  |  11.        RECEIVE PX |                           |     1.    13.     2 (0) | 00:00:01 |  Q1, 01 | SVCP |            |

  |  12.         PX SEND BROADCAST | : TQ10000 |     1.    13.     2 (0) | 00:00:01 |  Q1 00 | P-> P | BROADCAST |

  | * 13 |          VIEW                       |                           |     1.    13.     2 (0) | 00:00:01 |  Q1 00 | SVCP |            |

  |  14.           ITERATOR BLOCK PX |                           |     1.    13.     2 (0) | 00:00:01 |  Q1 00 | ISSUE |            |

  | * 15 |            TABLE ACCESS FULL | SYS_TEMP_0FD9D66BC_3BA6C3 |     1.    13.     2 (0) | 00:00:01 |  Q1 00 | SVCP |            |

  |  16.        KIND OF BUFFER.                           |     1.    13.     5 (0) | 00:00:01 |  Q1, 01 | SVCP |            |

  | * 17.         VIEW                        |                           |     1.    13.            |          |  Q1, 01 | SVCP |            |

  |  18.          ITERATOR BLOCK PX |                           |     1.    13.     2 (0) | 00:00:01 |  Q1, 01 | ISSUE |            |

  | * 19.           TABLE ACCESS FULL | SYS_TEMP_0FD9D66BC_3BA6C3 |     1.    13.     2 (0) | 00:00:01 |  Q1, 01 | SVCP |            |

  ----------------------------------------------------------------------------------------------------------------------------------------------

  Information of predicates (identified by the operation identity card):

  ---------------------------------------------------

  13 - filter ("ID"<>

  15 - access(:Z>=:Z AND:Z)<>

  17 - filter ("ID"<>

  19 - access(:Z>=:Z AND:Z)<>

  Concerning

  Jonathan Lewis

• Oracle 11.2 - perform parallel DML on a table that is not partitioned with LOB column

  Hello

  Since I wanted to demonstrate the new enhancements of Oracle 12 c on SECUREFICHIERS, I tried to use PDML declarations on a table that is not partitioned with LOB column, in Oracle 11 g and Oracle 12 c releases. The Oracle 11.2 SECUREFICHIERS and large objects Developer Guide January 2013 said clearly:

  Parallel execution of the following DML operations on tables with LOB columns is supported. These operations performed in parallel run only mode when it is run on a partitioned table. The DML statements on tables not partitioned with LOB columns continue to run in serial execution mode.

  • INSERT SELECT AS
  • CREATE TABLE AS SELECT
  • DELETE
  • UPDATE
  • MERGE (conditionally UPDATE and INSERT)
  • Multi-table INSERT

  So, I created and filled a simple table with a BLOB column:

  SQL> CREATE TABLE T1 (A BLOB);
  Table created.
  

  Then, I tried to see the execution of a parallel ABOLITION plan:

  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 ended up 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 was executed in 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 this normal? It is not supposed to be supported on Oracle 11 g with no partitioned table containing the LOB column...

  Thank you for your help.

  Michael

  Hello

  The explain plan shows that only the query is run in parallel but not delete it.

  Concerning

  Maurice

• Council in parallel and enable parallel dml

  Hi team,
  
  I found the following code in our development. And I did not understand why must be given
  ALTER TABLE < tnm > ACTIVATE PARALLEL DML and also
  Suspicion of parallel in the DML.

      EXECUTE IMMEDIATE ('alter session enable parallel dml') ;
      DELETE /*+parallel(a,4) */     FROM Temp a ;
   

  The statement above with Alter command and parallel Hint improve the performance of DML.
  
  Please suggest me.
  Thank you

  If we want to execute DML instructions in parallel, that we must allow the parallel DML for the session.

  The statement above with Alter command and parallel Hint improve the performance of DML.

  Yes. N ° maybe. Sometimes.

  If parallelization (dread Word) makes things run faster depends on many things. The number of cores has your server. How many other processes use the system at the same time. If there is a reasonable plan to organize the parallel threads. Into the INITRANS of the table settings.

  Parallel SQL is an important area that has a lot to understand. The best place to start is with Doug Burns paper on the subject. [url http://oracledoug.com/px_slaves.pdf] Find it here (attention: PDF)

  Cheers, APC

• Question about parallel hint and 'alter table enable parallel DML'

  Hi all
  
  I have a DML as follows:
  
  Insert / * + append * / into table1
  Select *.
  of COMPLEX_VIEW;
  
  Here complex_view contains a very complicated SQL, in which there is some heavy tables joins, subqueries, and aggregations.
  
  Question 1:
  
  Let's assume that the underlying tables have no attribute "parallel." Where should I add "parallel index" to force it to be run in parallel and can get better performance?
  
  Some members think that what follows is good.
  
  Insert / * + append * / into table1
  Select / * + parallel (a 4) * / *.
  of COMPLEX_VIEW;
  
  But I think that indicators must be put in the defintion of the complex view where they should be and do not put advice to the main insert DML, like this:
  
  Insert / * + append * / into table1
  Select *.
  of COMPLEX_VIEW; -I added the indicators in the COMPLEX_VIEW.
  
  What is your opinion?
  
  Quesion2:
  Without ' alter session enable parallel DML ", I can see the parallel session in v$ px_session thus." And the execution time has been shortened. This proves without this statement, the DML is also run in parallel.
  
  So, what is the effect of this statement?
  
  Best regards
  Leon

  I prefer the suspicion out of the COMPLEX_VIEW. This way, only this application forces the suspicion. If you put the indicator in the COMPLEX_VIEW, any other query on COMPLEX_VIEW (or Assembly of COMPLEX_VIEW to another view or a table) would also "encode" indicator in its execution. You don't then isolation parallel query to only where it is needed.

  If you put the parallel indicator in SELECT it (or view), the query is parallelized. This does not necessarily mean that the INSERT is parallelized. What you see v$ px_session are only slaves to PQ to SELECT.
  You must ALTER SESSION ACTIVATE PARALLEL DML and add the PARALLEL indicator in the INSERT.

  Hemant K Collette

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  Best regards
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  Extensions 'Tab Mix Plus' and "Tab Utilities" support Firefox 10.0a1, so no need to downgrade your old Firefox 7.0.1 for an even older version.

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  Please launch the Console application in one of the following ways:

  ☞ Enter the first letters of his name in a Spotlight search. Select from the results (it should be at the top).

  ☞ In the Finder, select go utilities ▹ of menu bar or press the combination of keys shift-command-U. The application is in the folder that opens.

  ☞ Open LaunchPad and start typing the name.

  Step 1

  For this step, the title of the Console window should be all Messages. If it isn't, select

  SYSTEM LOG QUERIES ▹ all Messages

  in the list of logs on the left. If you don't see this list, select

  List of newspapers seen ▹ display

  in the menu at the top of the screen bar.

  In the upper right corner of the Console window, there is a search box to filter. Enter the name of the application crashed or process. For example, if Safari has crashed, you would enter "Safari" (without the quotes).

  Each message in the journal begins with the date and time when it was entered. Select the messages since the time of the last fall, as appropriate. Copy to the Clipboard by pressing Control-C key combination. Paste into a reply to this message by pressing command + V.

  The journal contains a large amount of information, almost everything that is not relevant to solve a particular problem. When you post a journal excerpt, be selective. A few dozen lines are almost always more than enough.

  Please don't dump blindly thousands of lines in the journal in this discussion.

  Please do not post screenshots of log messages - text poster.

  Some private information, such as your name, may appear in the log. Anonymize before posting.

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  In the Console window, clear the search box, and then select

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  If you don't see any report, but you know, he had an accident, you have chosen diagnostic and using the list of Log Messages. INFORMATION on the USE of DIAGNOSTIC AND choose instead.

  In the interest of privacy, I suggest that, before posting, you change the UUID ' anonymous, ' a long string of letters, numbers and dashes in the header of the report, if it is present (it cannot be). "

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• The upgrade patch cannot be installed by the Windows Installer service because the program to be upgraded is may be missing, or the upgrade patch may update a different version of the program

  I try to use the Microsoft Office tool that implement an MSI for 64-bit Office 2010 installation file.  The tool works file and creates the msi file.  I get to the tool by going to the x 64-bit folder on the office 2010 installation disc.

  I install a new virtual machine from Windows 7 and tried to use the MSI file to install office 2010 and I get the error:

  "The upgrade patch cannot be installed by the Windows Installer service because the program to be upgraded is may be missing or the upgrade patch may update a different version of the program"

  If I just click Setup on the office 2010 dvd he moved very well on the same VM window7.

  Does anyone have an idea how do to understand why the windows installer keep fails or what he wants?

  If I click on the msi even on a system with office 2007 is installed, I get the same error.

  Thanks for the help

  jbabe

  Windows Update has nothing to do with the upgrade or installation of Office 2010. Please post future questions in this forum: http://social.answers.microsoft.com/Forums/en-US/officeinstall/threads

  ~ Robear Dyer (PA Bear) ~ MS MVP (that is to say, mail, security, Windows & Update Services) since 2002 ~ WARNING: MS MVPs represent or work for Microsoft

• Error message "the upgrade patch cannot be installed by the Windows Installer service because the program to be upgraded is may be missing or the upgrade patch may update a different version of the program."

  Original title: cannot install WMP11, update rollup 2

  I'm still on WMP 10 for a reason, and I wanted to connect my PC with 360 videos. I downloaded the update, but he told me to go get the Update Rollup 2 or something, so I tried to install it and he told me that I needed to go get the .NET framework 1.1 and .NET framework 1.1 SP1. I went to download them and install them, but he tells me that "the upgrade patch cannot be installed by the Windows Installer service because the program to be upgraded is may be missing or the upgrade patch may update a different version of the program".

  I Googled, tried of all kinds, uninstalled SP3 and tried and nothing.

  Hi xelliotx,
   
  I suggest that you follow these steps.
   
  Step 1:
   
  First of all, download and install .net Framework Cleanup Tool to remove selected versions of the .NET Framework on your computer.
   
  Step 2:
   
  Manually install the versions of Microsoft .NET Framework below:
   
  Microsoft .NET Framework Version 1.1 redistributable package
  http://www.Microsoft.com/downloads/details.aspx?FamilyId=262D25E3-F589-4842-8157-034D1E7CF3A3&displaylang=en
   
  Microsoft .NET Framework 1.1 Service Pack 1
  http://www.Microsoft.com/downloads/details.aspx?FamilyID=a8f5654f-088e-40b2-bbdb-a83353618b38&displaylang=en
  Once this installation is complete, try to install the other required software and check.
   
  See also:
   
  Error message when you install an update for .NET Framework 1.1 or the .NET Framework 1.0: "the upgrade patch cannot be installed by the Windows Installer service.
  http://support.Microsoft.com/kb/940332
  
  Aziz Nadeem - Microsoft Support

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• launch of checkers problems: error: trying to re-launch your game. If the problem persists, it may be network with the server problems or a problem with the configuration of your firewall.

  Windows Vista can not launch problem of checkers: try to re-launch your game. If the problem persists, it may be network with the server problems or a problem with the configuration of your firewall. Please check your firewall settings by visiting the Open Ports FAQ.

  Original title: launch of the problems of checkers:

  Hello

  If you have not yet tried to disable the antivirus/firewall software, then try the following steps to disable them.

  Disable the anti-virus software: http://windows.microsoft.com/en-US/windows-vista/Disable-antivirus-software

  Enable or disable Windows Firewall: http://windows.microsoft.com/en-US/windows-vista/Turn-Windows-Firewall-on-or-off

  IMPORTANT: Antivirus software can help protect your computer against viruses and other security threats. In most cases, you should not disable your antivirus software. If you do not disable temporarily to install other software, you must reactivate as soon as you are finished. If you are connected to the Internet or a network during the time that your antivirus software is disabled, your computer is vulnerable to attacks

• trying to high grade from vista to 7 and my coputure goes out 3/4 of the way in the installation. I start it and say my computer may not be to the highest ranking of any idea?

  trying to high grade from vista to 7 and my coputure goes out 3/4 of the way in the installation. I start it and say my computer may not be to the highest ranking of any idea? I got a microsoft tec tring to understand with a bit of luck again!

  Hello

  in this case, contact the HP support

  http://h10025.www1.HP.com/ewfrf/wc/contacthp?LC=en&DLC=en&cc=us

  or HP Support forums

  http://h30434.www3.HP.com/

  or repost in the correct forum for windows 7 that I have already advised you to do