Running parallel queries in 11 GR 2

I'm a little confused about parallel execution in GR 11, 2.

Lets say I have the Setup below.

parallel_servers_target = 4;

PARALLEL_MAX_SERVERS = 16;

parallel_degree_limit = CPU

parallel_threads_per_cpu = 2

parallel_adaptive_multi_user = TRUE

N ° of UC = 16 CPU, 2 cores each.

The Test table degree = DEFAULT

Example query:

Select * from Test by 1,2,3;

Lets say I want to run 5 in parallel sql statements that require 4 parallel workers each.

PARALLEL_DEGREE_POLICY = AUTO:

What of her below happen?

(a) a statement was going to be executed and the rest four would be queued because the first statement itself uses 4 parllel workers what amounts to our parameter of parallel_servers_target.

(b) four statements would be carried out using 4 workers each and the fifth would be queued because it exceeds the parallel_max_servers setting if it were to be executed.

Please explain what could happen if not a) or b).

PARALLEL_DEGREE_POLICY = MANUAL:

What of her below happen?

(a) four statements would be managed (using 4 parallel slaves each) and the fifth will be held in the series.

(b) all five would be using parallel workers. If so, please explain how the No. parallel to each statement slaves were to be distributed.

(c) it would first try to allocate 16 sons in the first statement. Later it will adjust accordingly and reduce parallel workers allocated to each statement and end up running two 4 statements with parallel workers or all the five workers parallel.

I appreciate really all of your answers on this.

UC = 60 (perhaps CPU_COUNT = 60), the number of cores = 15 - so you have four hardware threads by heart.

The DOP default value is calculated as PARALLEL_THREADS_PER_CPU * CPU_COUNT (in the single instance databases) - in your case, the DOP default is 2 * 60 = 120.

See this page 20 (http://www.oracle.com/technetwork/database/bi-datawarehousing/twp-parallel-execution-fundamentals-133639.pdf) :

Manually set the degree of parallelism

With PARALLEL_DEGREE_POLICY set to MANUAL Auto DOP feature is disabled and the end user must manage the use of parallel execution in the system.

You can either apply the default value of the so-called DOP or a specific fixed value for the declaration of principles on a session, statement or object level.

LACK of parallelism

...

Fixed degree of parallelism (DOP)

Unlike the LACK of parallelism, a specific DOP can be asked to the Oracle database. You can use one of the following ways to get a fixed DOP.

1. define a fixed DOP for objects. ALTER TABLE 8 PARALLELS customers. ALTER TABLE 16 PARALLELS sales;

2. use the suspicion level parallel (integer) statement. SELECT / * + parallel (8) * / COUNT (*) OF customers.

3. use the level indicator parallel (table_name, whole) object. SELECT / * + parallel (8 customers) * / COUNT (*) OF customers.

Note that the parameters in the table on the #1 above give you only the fixed DOP in manual mode and mode limited, namely when PARALLEL_DEGREE_POLICY is set to MANUAL or LIMITED.

All table decoration will be ignored in mode (AUTO or ADAPTIVE) AutoDOP.

Also note that for example # 1 parameters, Oracle will choose the DOP requested as follows:

-The queries accessing the CUSTOMERS table use a DOP asked 8.

-Accessing the SALES table queries ask a DOP of 16.

-Queries accessing both the SALES and the CUSTOMERS table will be processed with a DOP of 16. Oracle uses the upper DOP2.

The number of allocated PX servers can become always twice the requested DOP in the case of parallel processing requires two sets of PX server for treatment of producer/consumer.

And see on page 25:

Parameter: PARALLEL_MAX_SERVERS

Default value: PARALLEL_THREADS_PER_CPU * CPU_COUNT * concurrent_parallel_users * 5

Suggested value: default

Explanations: Sets the maximum number of servers in parallel execution that can allocate an instance of database. This is a hard limit and cannot be exceeded.

So, put PARALLEL_MAX_SERVERS > 120.

In fact, it would be better to change the PARALLEL_THREADS_PER_CPU = 1 parameter (default is 2). See this page 25:

Parameter: PARALLEL_THREADS_ PER_CPU

Default value: 2

Suggested value: 1 for platforms with hyperthreading enabled, 2 for other platforms

Explanations: Number of parallel processes that a processor can handle in parallel execution

Then the default DOP would be PARALLEL_THREADS_PER_CPU * CPU_COUNT = 1 * 60 = 60.

In this case, set PARALLEL_MAX_SERVERS > 60.

Kind regards

Zlatko

Tags: Database

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Hell

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SQL> explain plan for
  2  SELECT SUM(IMC.TYPICAL_PERCENT)   TYPICAL_PERCENT
  3        FROM rds.ITEM_MASTER_COMPONENT   IMC,
  4             rds.master_formula          frm
     WHERE FRM.FRM_ID = 2060055 AND
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SQL> select * from table (dbms_xplan.display) ;



----------------------------------------------------------------------------------------------------------------------------------------------------
| Id  | Operation                             | Name                          | Rows  | Bytes | Cost (%CPU)| Time     |    TQ  |IN-OUT| PQ Distrib |
----------------------------------------------------------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT                      |                               |     1 |    37 |    16  (13)| 00:00:01 |        |      |            |
|   1 |  SORT AGGREGATE                       |                               |     1 |    37 |            |          |        |      |            |
|   2 |   PX COORDINATOR                      |                               |       |       |            |          |        |      |            |
|   3 |    PX SEND QC (RANDOM)                | :TQ10004                      |     1 |    37 |            |          |  Q1,04 | P->S | QC (RAND)  |
|   4 |     SORT AGGREGATE                    |                               |     1 |    37 |            |          |  Q1,04 | PCWP |            |
|   5 |      NESTED LOOPS                     |                               |       |       |            |          |  Q1,04 | PCWP |            |
|   6 |       NESTED LOOPS                    |                               |     1 |    37 |    16  (13)| 00:00:01 |  Q1,04 | PCWP |            |
|   7 |        NESTED LOOPS                   |                               |   153 |  3213 |    11  (19)| 00:00:01 |  Q1,04 | PCWP |            |
|   8 |         BUFFER SORT                   |                               |       |       |            |          |  Q1,04 | PCWC |            |
|   9 |          PX RECEIVE                   |                               |       |       |            |          |  Q1,04 | PCWP |            |
|  10 |           PX SEND BROADCAST           | :TQ10002                      |       |       |            |          |        | S->P | BROADCAST  |
|* 11 |            TABLE ACCESS BY INDEX ROWID| MASTER_FORMULA                |     1 |     8 |     3   (0)| 00:00:01 |        |      |            |
|* 12 |             INDEX UNIQUE SCAN         | FRM_PK00                      |     1 |       |     2   (0)| 00:00:01 |        |      |            |
|  13 |         VIEW                          | VW_SQ_1                       |   153 |  1989 |     8  (25)| 00:00:01 |  Q1,04 | PCWP |            |
|  14 |          HASH UNIQUE                  |                               |   153 |  3519 |            |          |  Q1,04 | PCWP |            |
|  15 |           BUFFER SORT                 |                               |       |       |            |          |  Q1,04 | PCWC |            |
|  16 |            PX RECEIVE                 |                               |   153 |  3519 |            |          |  Q1,04 | PCWP |            |
|  17 |             PX SEND HASH              | :TQ10003                      |   153 |  3519 |            |          |  Q1,03 | P->P | HASH       |
|  18 |              HASH UNIQUE              |                               |   153 |  3519 |            |          |  Q1,03 | PCWP |            |
|  19 |               MERGE JOIN              |                               |   153 |  3519 |    22  (14)| 00:00:01 |  Q1,03 | PCWP |            |
|  20 |                SORT JOIN              |                               | 30200 |   353K|    19  (11)| 00:00:01 |  Q1,03 | PCWP |            |
|  21 |                 NESTED LOOPS          |                               | 30200 |   353K|    17   (0)| 00:00:01 |  Q1,03 | PCWP |            |
|  22 |                  BUFFER SORT          |                               |       |       |            |          |  Q1,03 | PCWC |            |
|  23 |                   PX RECEIVE          |                               |       |       |            |          |  Q1,03 | PCWP |            |
|  24 |                    PX SEND BROADCAST  | :TQ10000                      |       |       |            |          |        | S->P | BROADCAST  |
|  25 |                     FAST DUAL         |                               |     1 |       |     2   (0)| 00:00:01 |        |      |            |
|  26 |                  PX BLOCK ITERATOR    |                               | 30200 |   353K|    15   (0)| 00:00:01 |  Q1,03 | PCWC |            |
|  27 |                   INDEX FAST FULL SCAN| CMR_UN01                      | 30200 |   353K|    15   (0)| 00:00:01 |  Q1,03 | PCWP |            |
|* 28 |                SORT JOIN              |                               |     1 |    11 |     3  (34)| 00:00:01 |  Q1,03 | PCWP |            |
|  29 |                 BUFFER SORT           |                               |       |       |            |          |  Q1,03 | PCWC |            |
|  30 |                  PX RECEIVE           |                               |     1 |    11 |     2   (0)| 00:00:01 |  Q1,03 | PCWP |            |
|  31 |                   PX SEND BROADCAST   | :TQ10001                      |     1 |    11 |     2   (0)| 00:00:01 |        | S->P | BROADCAST  |
|* 32 |                    TABLE ACCESS FULL  | REGULATORY_APPLICATION        |     1 |    11 |     2   (0)| 00:00:01 |        |      |            |
|* 33 |        INDEX UNIQUE SCAN              | ITEM_MASTER_COMPONENT_NDX_N01 |     1 |       |     1   (0)| 00:00:01 |  Q1,04 | PCWP |            |
|  34 |       TABLE ACCESS BY INDEX ROWID     | ITEM_MASTER_COMPONENT         |     1 |    16 |     2   (0)| 00:00:01 |  Q1,04 | PCWP |            |
----------------------------------------------------------------------------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

  11 - filter("FRM"."IML_ID" IS NOT NULL)
  12 - access("FRM"."FRM_ID"=2060055)
  28 - access("CMR"."RAP_ID"="RAP"."RAP_ID")
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51 rows selected.

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try {}
responseEvent = snmp.send (command, target);//.1.3.6.1.4.1.2021.11.11.0
} catch (Exception e) {}
System.out.println ("Exception:" + e); e.printStackTrace ();
}
If (responseEvent.getResponse () == null) {}
request timed out
Returns a null value.
} else {}
Response PDU dump
PDU pdu = (responseEvent.getResponse ());
Output vector = new Vector();
Output = pdu.getVariableBindings ();
int val1 = 0;
Double CPUMemUtil = 0;
Dim str As String = null;
Str = Output.get (0) m:System.NET.SocketAddress.ToString ();
String [] Spstr = str.split("=");
Spstr [1] = Spstr [1] .trim ();
try {}
val1 = Integer.parseInt(Spstr[1]);
} catch (Exception e) {}
System.out.println ("An Exception occurred" + e); e.printStackTrace ();
}
CPUMemUtil = (100 - val1);
String OutputMemUtil = Double.toString (CPUMemUtil);
System.out.println ("CPU usage" + OutputMemUtil);

Thanks in advance,

Souto

Hello

Questions like these are much better handled in the TechNet IT Pro Forums.

My moderator tools cannot transfer messages on Windows forums, please re - ask you question there.

http://social.technet.Microsoft.com/forums/en/itproxpsp/threads

Jack-MVP Windows Networking. WWW.EZLAN.NET

Causes of white space, tab, and line breaks slow in running the queries? What is the main reason behind it?

Hi all

I am facing a weird problem in the SQL query. Taken, I wrote the request with the spaces, tabs and line breaks after execution it slows down the database and finally, I have to restart the database again. But after removing the spaces the application went very well. I don't know what the problem causing this slow run, but after the removal of whitespace to query everything works fine. I've also confirmed plans to explain the two after the removal of whitespace and previously had the same results.
I use the TOOL of DEVLOPER PL/SQL, SQL developer, Toad and Oracle 11 g.
***************************************************************
For example. (in reference to my original query):
Select
*
Of
Double;
****************************************************************
(After removing whitespace)
Select * twice;
*****************************************************************
What would be the reason for white spaces causing slow performance?
Please let me know if you need additional information on my question.

Thanks in advance,
HP

If you make the first request without spaces and the second by spaces you will see, the second is even faster...

The reason why are cached revenge...

HTH

Can I run parallel to R12.1.3, 11.2.0.3 adadmin?

Hello
I need to do the following in adadmin. Can I open multiple window and the parallel?
-recreate the grants and synonyms
-compile flexfields
-regen jar files - select YES when you are prompted to force the generation of jar files.
-recompile apps (check the invalid objects)
-regen forms and pll
-relink all the applications programs see: How do I create a link to a version 11i Installation of Applications and Release 12 (Doc ID 356878.1()
-menus to recompile
-keep the apps schema
Thank you

I need to do the following in adadmin. Can I open multiple window and the parallel?

N °

Thank you

Hussein

Report 10g Server (run multiple queries simultaneously)
Hi, I'm having a problem with the report server and I was wondering if there was a solution to this problem, I'll have.

I have several users who send requests from different report on the report server. My problem is that if the first is a report and a report of 1000 pages running, the 2nd user submits an application during execution of the 1st request, I noticed on the console of the report server, it says "pending in the queue.

Is there an option on the report server to allow applications to report both the user run simultaneously? In this way, users are not waiting for another request to finish. I'm looking and I'm not just see.

Any help is appreciated.

Chris
Chris,

On the application server, edit this file:

\reports\conf\.conf

In this folder, find: engine id = "rwEng" and change the value of maxEngine from 1 to 4

Save the file and restart the report server.

I hope this helps.

Parallel queries on non partitioned tables
I'm using the 11g database.

I have a table that is partitioned on column a flag (Y and N), as of now all of the values of this column is Y, while values exist on the one parition while the other partition is empty.

We use the NAS with RAID storage. If the content of the files is distributed on disks. In this case the parallel requests will be of no use. We use 2 quad core processors, so I guess that according to oracle documentation that parallelism can be set to 16 (8 cores * 2 (slaves for each carrot)).

My question is since the table isn't actually paritioned parallelism will be of no use here?
Because the data is distributed parallel slaves will be able to access content from multiple disks at the same time without expectations?

Published by: souad on November 26, 2009 13:44
Oracle is not clear how many disks is underlying file system.

Parallelism can be used even on a single disc, even if the table is not partitioned. That is to say, there is no prohibition or internal control prevents you specify parallelism as a hint or a table / index attribute.
However, if it will be useful really depends on many factors:
a. how well the e/s flow performs
(b) the effects of the other sessions at the same time do I/O
c. the number of blocks that really needs to be read
d. If you have enough CPU cores and cycles to manage parallelism
etc.

Hemant K Collette

Running parallel queries in 11 GR 2

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