How to implement parallel processing in oracle.

Hi Gurus,
In one our procedures we are calling 7 procedures internally. We want to execute them parallely insted of sequentially.
Please help me to resolve this issue.
thanks in advance...

Hi,
You have dbms_job package in Oracle 9i and dbms_scheduler from Oracle 10g.
Though you can run all these procedures parallel submitting via dbms_job, any exception/error out in any of these procedures need to be handled explicitly. Just be aware that once you submit these jobs, your application loses control of the execution and you have to build a whole infrastructure for rerun in case of an exception(log/exception tables, monitoring application to periodically check the exception tables, alerts from procedures in case of an exception and so on ...)
It's going to become more complex if you have any dependencies between these procedures.

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How to do parallel processing with dynamic internal table

Hi All,
I need to implement parallel processing that involves dynamically created internal tables. I tried doing so using RFC function modules (using starting new task and other such methods) but didn't get success this requires RFC enabled function modules and at the same time RFC enabled function modules do not allow generic data type (STANDARD TABLE) which is needed for passing dynamic internal tables. My exact requirement is as follows:
1. I've large chunk of data in two internal tables, one of them is formed dynamically and hence it's structure is not known at the time of coding.
2. This data has to be processed together to generate another internal table, whose structure is pre-defined. But this data processing is taking very long time as the number of records are close to a million.
3. I need to divide the dynamic internal table into (say) 1000 records each and pass to a function module and submit it to run in another task. Many such tasks will be executed in parallel.
4. The function module running in parallel can insert the processed data into a database table and the main program can access it from there.
Unfortunately, due to the limitation of not allowing generic data types in RFC, I'm unable to do this. Does anyone has any idea how to implement parallel processing using dynamic internal tables in these type of conditions.
Any help will be highly appreciated.
Thanks and regards,
Ashin

try the below code...
DATA: w_subrc TYPE sy-subrc.
DATA: w_infty(5) TYPE c.
data: w_string type string.
FIELD-SYMBOLS: <f1> TYPE table.
FIELD-SYMBOLS: <f1_wa> TYPE ANY.
DATA: ref_tab TYPE REF TO data.
CONCATENATE 'P' infty INTO w_infty.
CREATE DATA ref_tab TYPE STANDARD TABLE OF (w_infty).
ASSIGN ref_tab->* TO <f1>.
* Create dynamic work area
CREATE DATA ref_tab TYPE (w_infty).
ASSIGN ref_tab->* TO <f1_wa>.
IF begda IS INITIAL.
    begda = '18000101'.
ENDIF.
IF endda IS INITIAL.
    endda = '99991231'.
ENDIF.
CALL FUNCTION 'HR_READ_INFOTYPE'
    EXPORTING
      pernr           = pernr
      infty           = infty
      begda           = '18000101'
      endda           = '99991231'
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      subrc           = w_subrc
    TABLES
      infty_tab       = <f1>
    EXCEPTIONS
      infty_not_found = 1
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IF sy-subrc <> 0.
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How can I implement parallel processing feature in Oracle 9i?

I need to load (and transform) millions of data from Table1 to Table2. How can I speed the process using parallel processing. The server has 4 processors (running on Win2k Advanced server).
Can anyone guide me what are the exact steps required to enable parallel loading. I've already partitioned Table1 into 4 parts.

insert /*+ PARALLEL(8) */ into table A select * from table B ;
or alter table A parallel 8 ;
or alter session enable parallel dml ;
Look for PARALLEL on http://tahiti.oracle.com for more infos.
Fred

How to enable an monitor parallel processing in Oracle

Hi All,
I have 2 short questions:
1. When we want parallel processing, we can either use a parallel hint in the query, or alter a table to be parrallel. My question is what is the difference in the following 2 syntax:
a. ALTER TABLE myTable PARALLEL (DEGREE 3);
b. ALTER TABLE myTable PARALLEL 3;
Does the "DEGREE" keywor make any difference? or they both are same statements?
2. When we enable parallel processing, how can we monitor oracle processes, to confirm that a certain table is being actually processed by multiple threads of a singe user process?
An early response would be highly appreciated. Thanks.

1)The parallel clause lets you change the default degree of parallelism for queries and DML on the table.
2) PARALLEL DEGREE specifies the number of query server processes that can scan the table in parallel. Either specify a positive integer or DEFAULT which signifies to use the initialization parameter
check further http://mywebsys.com/oracle/syntax/view_syntax.php?id=23
Thanks

How to achieve parallel processing in a single request?

Hi all,
I have a method in a Session EJB that will perform some business logic before it returns an answer to the client. The logic it will perform is to collect data from the applications database and two external systems, before sending all data to a third external system to get a response and send it back to the client. Each external system is quite slow so I would like to do all the collecting of data concurrent, parallel processing. How should I handle this? I'm not allowed to create my own threads in EJB's. Can I use MDB in some way? To the calling client this should be a synchronous call...
Greatfull for any suggestions
Cheers
Anders =)

Usually, the request is received by a component located in the web container, such as by an HTTP request (including Web Services). This component is able to start threads to allow parallel processing. Now, if for some reason the request arrives directly at EJB level and that you cannot move its receiver to web component, I think JMS is not a viable solution because you will switch to asynchronous processing and you have no way to make your EJB wait for the responses while preserving the client request (waiting implies programmatic life cycle management, which is forbidden in EJB container). Maybe a resource adapter (JCA) can bring a solution. A resource adapter acts as a datasource (a datasource is a specialization of a resource adapter) and thus it is a logical way to implement an adapter to an external, eventually non-J2EE, resource, as the name implies :) But I don't have enough knowledge in JCA to be sure of this.
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Parallel Processing in Oracle 10g

Dear Oracle Experts,
I would like to use the Parallel Processing feature on My production database running on Unix Box.
No: of CPU in each node is 8 and its RAC database
Before going for this option i would like to certain things regarding Parallel Processing.
1. According to my server specification how much DOP i can specify.
2. Which option for Setting Parallel is good
a. Using the 'alter table A parallel 4' or passing the parallel hints in the sql statements
3. We have a batch processing jobs which are loading data into the tables from flat files (24*7) using sql loader. is it possible to parallel this operation and any negative effect if enabled parallel.
4. Query or DML - which one will be perform best with parallel option.
5. What are the negative issue if parallel option is enabled.
6. what are the things to be taken care while enabling the parallel option.
Thanks in Advance
Edited by: user585870 on Jun 7, 2009 12:04 PM

Hi,
first of all, you should read [Using Parallel Execution|http://download.oracle.com/docs/cd/B19306_01/server.102/b14223/usingpe.htm#DWHSG024] in documentation for your version - almost all of these topics are covered there.
1. According to my server specification how much DOP i can specify.It depends not only on number of CPU. More important factors are settings of PARALLEL_MAX_SERVERS and PARALLEL_ADAPTIVE_MULTI_USER.
2. Which option for Setting Parallel is good - Using the 'alter table A parallel 4' or passing the parallel hints in the sql statementsIt depends on your application. When setting PARALLEL on a table, all SQL dealing with that table would be considered for parallel execution. So if it is normal for your app to use parallel access to that table, it's OK. If you want to use PX on a limited set of SQL, then hints or session settings are more appropriate.
3. We have a batch processing jobs which are loading data into the tables from flat files (24*7) using sql loader. is it possible to parallel this operation and any negative effect if enabled parallel.Yes, refer to documentation.
4. Query or DML - which one will be perform best with parallel option.Both may take advantages of using PX (with some restrictions to Parallel DML) and both may run slower than non-PX versions.
5. What are the negative issue if parallel option is enabled.1) Object checkpoint happens before starting parallel FTS (true for >=10gR2, before that version tablespace checkpoint was used)
2) More CPU and memory resources are used with PX - it may be both benefit and an issue, especially with concurrent PX.
6. what are the things to be taken care while enabling the parallel option.Read the documentation - it contains almost all you need to know. Since you are using RAC, you sould not forget about method of PX slaves load balancing between nodes. If you are on 10g, refer to INSTANSE_GROUPS/PARALLEL_INSTANCE_GROUPS parameters, if you are using 11g then properly configure services.

How to monitor parallel processing

Hi All,
I have 2 short questions:
1. When we want parallel processing, we can either use a parallel hing in the query, or alter a table to be parrallel. My question is what is the difference in the following 2 syntax:
a. ALTER TABLE myTable PARALLEL (DEGREE 3);
b. ALTER TABLE myTable PARALLEL 3;
Does the "DEGREE" keywor make any difference? or they both are same statements?
2. When we enable parallel processing, how can we monitor oracle processes, to confirm that a certain table is being actually processed by multiple threads of a singe user process?
An early response would be highly appreciated. Thanks.

user566817 wrote:
2. When we enable parallel processing, how can we monitor oracle processes, to confirm that a certain table is being actually processed by multiple threads of a singe user process?There are a number of virtual performance views that can be used. Please refer to the Oracle® Database Reference guide for details on these.
Had a look though my scripts and I have this one.. cannot recall if I "borrowed" it from somewhere and customised it and how old it is.. but it should (hopefully) still be mostly correct. It uses the virtual view v$px_process to determine the list of current PQ slaves in the pool and if they are used, map them to the Oracle session using them.
select distinct
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        x.status                as "Status",
        x.sid                   as "OraPID",
        w2.sid                  as "Parent OraPID",
        v.osuser                as "O/S User",
        v.schemaname            as "User",
        w1.event                as "Child Wait",
        w2.event                as "Parent Wait"
from    v$px_process    x,
        v$lock          l,
        v$session       v,
        v$session_wait w1,
        v$session_wait w2
where   x.sid =! l.sid(+)
and     to_number (substr(x.server_name,3)) = l.id2(+)
and     x.sid = w1.sid(+)
and     l.sid = w2.sid(+)
and     x.sid = v.sid(+)
and     nvl(l.type,'PS') = 'PS'Use at own risk - best would be to verify that this is still valid using the Reference Guide. Or create similar ones using the available V$ views for the details you want to see (e.g. SQL statement executed per PQ, etc).

Anyone knows how to implement Decomposition Tree in Oracle BI products? to

Hello Everybody
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How to enable Parallelism process in 10.1.0.5 database

Hi All,
We have oracle database 10.1.0.5 running in windows 2003 server.
I am trying to enable parallelism process in the database by including the following init parameters
PARALLEL_AUTOMATIC_TUNING
PARALLEL_SERVER
PARALLEL_MIN_SERVERS
PARALLEL_MAX_SERVERS
But while i am trying to bring the database i am getting an error message like these parameter has been deprecated.
Could anyone help me to enable parallel process in 10g database.
Thanks in advance.
Regards
Aruna

>
I am trying to enable parallelism process in the database by including the following init parameters
PARALLEL_AUTOMATIC_TUNING
PARALLEL_SERVER
PARALLEL_MIN_SERVERS
PARALLEL_MAX_SERVERS
But while i am trying to bring the database i am getting an error message like these parameter has been deprecated.
>
PARALLEL_AUTOMATIC_TUNING is deprecated since 10g. It's always true now. PARALLEL_SERVER is related to OPS (prior to RAC) and long time deprecated.
You enable parallel query with an ALTER TABLE statement like
SQL> ALTER TABLE SALES PARALLEL;or with a hint like
SQL> select /*+ parallel(sales) */ * from sales;Kind regards
Uwe
http://uhesse.wordpress.com

How to retrieve parallel process info (aRFC)

Hi guys , I have a program that calls 2 RFC-enabled function modules and runs them in parallel. To my knowledge, each function modules is assigned with a unique task id when performing parallel processing.
My question is, how do I retrieve the information on the individual process such as task name and its duration?
say
call function 'Z_XXX' starting new task 'A' performing 'Z_FUNC' on end of task.....
and
call function 'Z_XXX' starting new task 'B' performing 'Z_FUNC' on end of task .....
then execute these functions and let it runs for a while, then how do i retrieve the task name of each process programmatically (A and B)?
sorry I'm still pretty new when it comes to ABAP
edit:-
somehow my previous question was removed along with replies
Edited by: afro100 on Aug 27, 2009 1:51 PM

Hello,
You can use following function module to get the id of transactional processing.
CALL FUNCTION 'ID_OF_BACKGROUNDTASK'
* EXPORTING
*   DEST          = ' '
* IMPORTING
*   TID           = --> collect ID from this varaible
*   FNUM          =
and for reteriving status you can use:
CALL FUNCTION 'STATUS_OF_BACKGROUNDTASK'
EXPORTING
    tid                 =
tables
    errortab            =
* EXCEPTIONS
*   COMMUNICATION       = 1
*   RECORDED            = 2
*   ROLLBACK            = 3
*   OTHERS              = 4
IF sy-subrc <> 0.
* MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
*         WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
Hope this helps!
Thanks,
Augustin.

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Queue 1: up to 4 messages in parallel
Queue 2: up to 2 messages in parallel
Queue 3: up to 5 messages in parallel
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Thank you very much,
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+Session pools enable an application to process messages concurrently. Session pools are now used rarely, as they are not a required part of the J2EE specification, do not support JTA user transactions, and are largely superseded by message-driven beans (MDBs), which are a required part of the J2EE specification.+
I continue reading the MDB chapter of the performance and tuning guide in the documentation, thanks for any contribution to the topic.
Lucas.

How to implement invoker rights in oracle 9i

implement invoker rights in oracle 9i

Invoker rights is a new model for resolving references to database elements in a PL/SQL program unit. From Oracle 8i onwards, we can decide if a program unit should run with the authority of the definer or of the invoker. This means that multiple schemas, accessing only those elements belonging to the invoker, can share the same piece of code.
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authid current_user is
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pio_status = 'OK';
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where parcod = pi_parcod
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~ Madrid.

How to Implement User Area in Oracle Forms 6i

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Parallel Processing in Oracle

Gurus,
I need to run three cursors at a time. Is it possible in Oracle?
If yes then help in this issue.
Thanks in Advance.

As mentioned, it all depends on whether the results of the 3 cursor processes need to be combined/processed afterwards.
If not, and each cursor process is a independent process, then you can define each of the 3 processes as procedures.
The "main process" can then simply use the Oracle Job Scheduler to start once-off jobs for these 3 PL/SQL procedures. These will then run in parallel, as batch/background jobs.
If the "main process" needs to wait for some reason for these 3 processes to complete processing (and commit their changes), then the following loop structure can be used:
loop
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-- if not. sleep for n seconds and then check again
DBMS_LOCK.Sleep( n );
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How To Integrate BPEL Process Into Oracle Weblogic Portal 10.3

Hi All,
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OR
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How to implement parallel processing in oracle.

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