Difference between parallelism and allocate channel

Whats the difference between
Rman> run{
allocate channel c1 device type disk;
allocate channel c2 device type disk;
AND
RMAN> configure channel device type disk parallelism 2;

Channel:
Each channel establishes a connection from the RMAN client to a target or auxiliary database instance by starting a server session on the instance. The server session performs the backup, restore, and recovery.
PARALLELISM:
Configures the device types that are eligible for use in jobs that use automatic channels and sets the degree of channel parallelism. The DISK device type is the default.
The PARALLELISM parameter specifies the number of automatic channels of the specified device type allocated for RMAN jobs. RMAN always allocates the number of channels specified by PARALLELISM, although it may actually use only a subset of these channels.
By default, PARALLELISM = 1. Specifying CLEAR for a device type resets its settings to the default. For example, you can set PARALLELISM for disk backups to 3. If you configure automatic channels of type disk and tape, and set the default device type as disk, then RMAN allocates three disk channels when you run BACKUP DATABASE at the RMAN prompt.
To change the parallelism for a device type to n, run a new CONFIGURE DEVICE TYPE ... PARALLELISM n command. For example, you can change configure PARALLELISM to 3 for sbt and then change it to 2 as follows:
CONFIGURE DEVICE TYPE sbt PARALLELISM 3;
CONFIGURE DEVICE TYPE sbt PARALLELISM 2;
Regards
Asif Kabir

Similar Messages

MAIN DIFFERENCES BETWEEN PARALLEL AND SEQUENTAIL PRCESSING???

HI PALS,
I WANT THE COMPLETE DIFFERENCES BETWEEN PARALLEL AND SEQUENTIAL PROCESSING!
IN THE CONTEXT OF RFC.

Hi
Parallel Processing
To achieve a balanced distribution of the system load, you can use destination additions to execute function modules in parallel tasks in any application server or in a predefined application server group of an SAP system.
Parallel-processing is implemented with a special variant of asynchonous RFC. Itu2019s important that you use only the correct variant for your own parallel processing applications: the CALL FUNCTION STARTING NEW TASK DESTINATION IN GROUP keyword. Using other variants of asynchronous RFC circumvents the built-in safeguards in the correct keyword, and can bring your system to its knees
Details are discussed in the following subsections:
·        Prerequisites for Parallel Processing
·        Function Modules and ABAP Keywords for Parallel Processing
·        Managing Resources in Parallel Processing
Prerequisites for Parallel Processing
Before you implement parallel processing, make sure that your application and your SAP system meet these requirements:
·        Logically-independent units of work:
The data processing task that is to be carried out in parallel must be logically independent of other instances of the task. That is, the task can be carried out without reference to other records from the same data set that are also being processed in parallel, and the task is not dependent upon the results of others of the parallel operations. For example, parallel processing is not suitable for data that must be sequentially processed or in which the processing of one data item is dependent upon the processing of another item of the data.
By definition, there is no guarantee that data will be processed in a particular order in parallel processing or that a particular result will be available at a given point in processing.
·        ABAP requirements:
¡        The function module that you call must be marked as externally callable. This attribute is specified in the Remote function call supported field in the function module definition (transaction SE37).
¡        The called function module may not include a function call to the destination u201CBACK.u201D
¡        The calling program should not change to a new internal session after making an asynchronous RFC call. That is, you should not use SUBMIT or CALL TRANSACTION in such a report after using CALL FUNCTION STARTING NEW TASK.
¡        You cannot use the CALL FUNCTION STARTING NEW TASK DESTINATION IN GROUP keyword to start external programs.
·        System resources:
In order to process tasks from parallel jobs, a server in your SAP system must have at least 3 dialog work processes. It must also meet the workload criteria of the parallel processing system: Dispatcher queue less than 10% full, at least one dialog work process free for processing tasks from the parallel job.
Function Modules and ABAP Keywords for Parallel Processing
You can implement parallel processing in your applications by using the following function modules and ABAP keywords:
·        SPBT_INITIALIZE: Optional function module.
Use to determine the availability of resources for parallel processing.
You can do the following:
¡        check that the parallel processing group that you have specified is correct.
¡        find out how many work processes are available so that you can more efficiently size the packets of data that are to be processed in your data.
·        CALL FUNCTION Remotefunction STARTING NEW TASK Taskname DESTINATION IN GROUP:
With this ABAP statement, you are telling the SAP system to process function module calls in parallel. Typically, youu2019ll place this keyword in a loop in which you divide up the data that is to be processed into work packets. You can pass the data that is to be processed in the form of an internal table (EXPORT, TABLE arguments). The keyword implements parallel processing by dispatching asynchronous RFC calls to the servers that are available in the RFC server group specified for the processing.
Note that your RFC calls with CALL FUNCTION are processed in work processes of type DIALOG. The DIALOG limit on processing of one dialog step (by default 300 seconds, system profile parameter rdisp/max_wprun_time) applies to these RFC calls. Keep this limit in mind when you divide up data for parallel processing calls.
·        SPBT_GET_PP_DESTINATION: Optional function module.
Call immediately after the CALL FUNCTION keyword to get the name of the server on which the parallel processing task will be run.
·        SPBT_DO_NOT_USE_SERVER: Optional function module.
Excludes a particular server from further use for processing parallel processing tasks. Use in conjunction with SPBT_GET_PP_DESTINATION if you determine that a particular server is not available for parallel processing (for example, COMMUNICATION FAILURE exception if a server becomes unavailable).
·        WAIT: ABAP keyword
WAIT UNTIL
Required if you wish to wait for all of the asynchronous parallel tasks created with CALL FUNCTION to return. This is normally a requirement for orderly background processing. May be used only if the CALL FUNCTION includes the PERFORMING ON RETURN addition.
·        RECEIVE: ABAP keyword
RECEIVE RESULTS FROM FUNCTION Remotefunction
Required if you wish to receive the results of the processing of an asynchronous RFC. RECEIVE retrieves IMPORT and TABLE parameters as well as messages and return codes.
Managing Resources in Parallel Processing
You use the following destination additions to perform parallel execution of function modules (asynchronous calls) in the SAP system:
In a predefined group of application servers:
CALL FUNCTION Remotefunction STARTING NEW TASK Taskname
DESTINATION IN GROUP Groupname
In all currently available and active application servers:
CALL FUNCTION Remotefunction STARTING NEW TASK Taskname
DESTINATION IN GROUP DEFAULT
Sequential Processing
In the following cases, the system chooses sequential (non-parallel) processing:
●      In table RSADMIN, entry QUERY_MAX_WP_DIAG has value (column value) 1.
●      The entire query consists of one sub-access only.
●      The query is running in a batch process.
●      The query was started from the query monitor (transaction RSRT) using various debug options (for example, SQL query display, execution plan display). See, Dividing a MultiProvider Query into Sub-Queries.
●      The query requests non-cumulative key figures.
●      Insufficient dialog processes are available when the query is executed. These are required for parallel processing.
●      The query is configured for non-parallel processing.
●      You want to save the result of the query in a file or a table.
In Release SAP NetWeaver 7.0, the system can efficiently manage the large intermediate results produced by parallel processing. In previous releases, the system terminated when it reached a particular intermediate result size and proceeded to read data sequentially. This is no longer the case. Therefore, the RSADMIN parameter that was used in previous releases for reading a MultiProvider sequentially is no longer used.
Reward If Helpfull,
Naresh

What is the difference between Parallels and Parallels Desktop ?

hope this is the right forum i couldnt find a parallels forum
but is there a difference betwenn parallels and parallels desktop ?
i want to run some .exe files on my Mac
i DONT want to invest $200 in a Windows OS to put on my mac
i have XP on an Old SLOW PC but as i said...its slow
Codeweavers by Crossover use useless....

CoffeehouseSchmuck wrote:
what confused me is i saw a video where this guy had a Transfer Cable that came WITH Parallells desktop And he had just bought a MAc for the first time and Parallels Desktop because his windows PC was about dead
OK? Transfer Cable ? What is being transfered ?
I didnt think you could just uproot a Windows OS on an almost dead Tower and Transfer it to a virtual window
That would be Nice though,
You don't "uproot" Windows. You install Windows using Parallels to create a virtual Windows computer on your Mac. You don't transfer the OS to a virtual window. You transfer any existing data you want to the Windows virtual machine. This can be done by networking your virtual machine to your old computer in the same manner you network any computers in a LAN (wireless, Ethernet, etc.). Or you transfer your data manually (Sneakernet, sd card, flash drive, etc.)
Perhaps reviewing the info at the Parallels site will help you.
http://www.parallels.com/landingpage/dskd623/?source=gus&gclid=CMrIp7er0qMCFSFVgwodUFRndQ

Differences between eCommerce and Web Channel

Hi. I'm really new to SAP. I'm looking at leveraging some of the built-in e-commerce functionality of SAP. I've read a few articles on the SAP help site but I can't distinguish the differences between the following 2 solution options:
1) ERP eCommerce
2) CRM Web Channel
From what I've read, both of the above technologies do relatively the same thing. Can someone let me know if this is true, or if not, where I can find details on when to use one versus the other?
Thanks!
- Dylan

Hi,
please let me try to clarify this.
Both of the solutions are actually based on the same Java web applications. This means both applications share the same core functionality. The main difference between ERP eCommerce and CRM Web Channel is the backend system used for the web shop.
The reason why SAP offers two different backends for the web shop is pretty simple. Each backend is suitable for different requirements. While running the web shop with a CRM backend, some additional features related to the marketing functionality of SAP CRM are available. These addtional features include cross- and upselling, campaign management and advanced catalog management. For customers that don't need these marketing features or don't want to invest in a SAP CRM system, there is the ERP eCommerce solution. While the shop system is the same, some of the additional features offered in the CRM version are missing.
I hope that solves the problem for now. If you have more questions on the difference between the two solutions please let me know.

Difference between parallel sequence and parallel operation in a routing.

Hi Experts,
Can any one explain me with example the difference between parallel sequence and parallel operation in a routing? wHEN CAN WE USE PARALLEL OPEARTION AND PARALLEL SEQUNCE WITH COMPONENT ALLOCATION.
Regards
Deepak sharma

I think u need to modify ur quest... i think u r asking about Parallel sequence and alternate seq. Below are the details from SAP site.
A parallel sequence enables you to process several operations at the same time.
You use an alternative sequence for example, if
--The production flow is different for certain lot-size ranges
For instance you can machine a work piece on conventional machine or on NC machines. A NC machine has a longer set-up time than a conventional machine. However the machining costs are considerably less. Therefore whether you use NC machines will depend on the lot size.
---The production flow changes under certain business conditions.
For instance, if you have a capacity problem, you have some production steps performed externally by a vendor.

What is the difference between SWF and F4V in the context of Streaming or progressive Download?

Hello everybody,
I am absolutely a beginner in working with Captivate and furthermore my technological know how is not that good.
So, I have problems to understand if the export formats SWF and F4V are both capable to be published in the Internet as streaming video and as progressive Download? Well so, I do not really understand the difference between streaming and progessive download either?
Furthermore I was asking myself if this issue depends on how I imported flash videos (there are these two options) in my Captivate project during the production phase?
I would be very thankful for some helping information!
Greetings,
Mareike the beginner

Welcome to our community
I'm not certain I fully understand the differences myself, but will toss out what I believe to be true about the formats. Hopefully, if I'm incorrect in my bellief, someone with more definitive knowledge will chime in.
It was explained to me a couple of years back and is my understanding that "streaming" only applies to a video based format such as F4V, FLV and it doesn't apply to SWF. With SWF, you may specify a preload value. So when the SWF transmits from the web server to the PC, a certain percentage has to be received before play begins. But that's not streaming. It's preloading.
For streaming to occur, the web server establishes a communication channel between the server and the destination PC. This channel is monitored to see what speed is in use. Only enough information is then transmitted to be comfortable at that speed. If the speed improves during the connection, the server serves data at a faster rate. If the connection degrades, the information transmitted is also scaled back so as to accommodate the lower speed.
With SWF, after it has all been downloaded, a savvy user is able to poke around in their temporary internet files and save the SWF for play later. With streaming, this isn't possible because as the stream is viewed, it evaporates from memory.
Seriously hoping others will chime in here to confirm or deny this.
Cheers... Rick
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What's the difference between 2nd and 3rd generation

PLEASE HELP! New Apple user and looking to purchase a used 2nd or 3rd generation ipod touch.
what's the difference between 2nd and 3rd generation?
apparently I am told that the 2nd gen does not have the capabilities of listening without headphone? and the 3rd gen does??

Hi maximumslowness - (great name),
The 2nd gen Touch has one internal speaker, so you can listen to it, (both left and right channels) without headphones.
However - it's a small single speaker and it is not very loud. It's not designed for quality listening (neither is the speaker on the 3rd gen as far as I know) and probably will not be adequate if there is a lot of background noise nearby.
One option is to drop the iPod (not literally!) into an iPod Docking station so that the sound can play out through a self-contained mains-powered amplified speaker, which will also charge your iPod. There are many on the market. On the bottom of the iPod is the 30-pin dock connector which can be used to feed the audio to a docking station. Another option is simply to use a cable to connect from the headphone socket to the audio input on any amplifier.
Yet another is to plug in a small fold-up style speakers, such as
http://www.amazon.co.uk/Portable-Folding-Speakers-iPods-Players/dp/B000A1QKNU/re f=sr_1_84?ie=UTF8&qid=1332326622&sr=8-84
or http://www.amazon.co.uk/Generation-Capsule-iPhone-Laptop-Speaker/dp/B002XNO7FQ/r ef=sr_1_6?ie=UTF8&qid=1332326656&sr=8-6
I've no idea how good the sound is, you'll have to judge that for yourself. The links are both to a UK store, but most countries will have a similar option.
I do not recieve any form of payment or compensatiion for the above links.
Message was edited by: the fiend

Is there any performance difference between unique and no unique index

Hi,
We are working with both databases Oracle and MS-SQL and we have an open channel to MS-SQL server core team.
We got the word from them that there is a difference between unique and no unique index from the optimizer perspective, i.e. the optimizer knowing that the index is unique may choose a more suitable plan for running a specific query, we're still trying to find a specific example.
Anyway, since we do not have an open channel to Oracle core, I thought maybe one of you guys knows something about Oracle optimizer behavior on this issue.
I am interested verified answers from certified sources and not suggestions or thoughts.
Thanks in advanced,
Tal ([email protected]).

Maybe, you will like to check this link for a similar question answered by Tom Kyte
http://asktom.oracle.com/pls/ask/f?p=4950:8:385900000490041683::NO::F4950_P8_DISPLAYID,F4950_P8_CRITERIA:7641143144618,

Difference between Flow and FlowN

Hi,
can you please tell me difference between flow and flowN
Thanks
Nirmal

see : http://docs.oracle.com/cd/B31017_01/integrate.1013/b28981/parallel.htm
flow will make use of a predefined (by you) amount of branches, with flowN you can make the amount of branches dynamic
so lets say we have
getUserDetails
getAddressDetails
now you can use flow, create 2 branches and do the call to both methods in each branch.
let's say you receive a list of customers in your service interface. Now you can loop over with for-each of every customer and sequential do logic like getCustomerDetails in the loop, or ...you create a flowN and N will be the count of the customers in the list.
After this you will get N parallel branches which will do getCustomerDetails (instead of the other sequential looping)
so flowN is the dynamic variant which will create N branches based on the counter-field you base your expression on

What is the difference between occurs0 and occurs1

pls explain about the difference between occurs0 and occurs1 in sap-abap.

Hi Suresh,
WELCOME TO SDN
Please check this link
diff b/w occurs 0 and 1
Occurs 0 and Occurs 1...
Occours 0
Occurs 1 allocates 1 unit of memory(Sufficient to hold one record) and and when one record is appended, one more unit of memory is allocated.
Occurs 0 will allocate memory dynamically.It will not allocate any memory when the itab is declared.
Coming to performance: If you know that you will store only one single value in the Internal table If you use OCCURS 1. It would perform well than OCCURS 0.
Occurs 0 keeps on incrementing when there is a value. But Occurs 1 will assign a single space even though there is no value.
Lets suppose you did not get any values from the DB after a select, in this case if you write Occurs 0 it will not allocate any single space in the memory. If you write OCCURS1 it will pre allocates some memory.
Hope this helps...
Best regards,
raam

What is the difference between Campaign and Trade Promotion?

hi experts,
What is the difference between Campaign and Trade Promotion?
regards,
babu

Hi,
Campaign serve operative marketing planning. They describe actions that are carried out, for example mailing actions, product promotions, and telemarketing. Crieria such as target groups, products, documents, people responsible, and the budget are defined in the campaign for these activities.
Campaign are basically used for operative marketing planning and execution.
Trade Promotions are Marketing activity used by industries that sell into the retail channel or through brokers or wholesalers. A trade promotion takes place within a specific time period and aims to increase brand capital, brand awareness, and market share. It is also used to increase sales volume or to launch new products or product lines.
Trade promotions are structurally similar to other marketing objects, except that trade promotions are targeted at a key account.
A trade promotion has a header that provides overview information about the trade promotion, such as the intended key account, the product planning basis, the trade promotion objective, funds plan details, and trade promotion status.
Assignment blocks contain specific information pertaining to, for example, trade promotion dates, products, and causals.
For more information on Trade Promotion please go through the following link:
http://help.sap.com/saphelp_crm60/helpdata/en/eb/aa80ae2ea44778a987960a847fc6ce/frameset.htm
Main difference is campaign is an operative instrument to manage the interactions between the customers and the system

Difference between exipre and obosolete

Hi ALL,
WHAT IS THE EXACT DIFFERENCE BETWEEN exipre and obosolete WITH REFERENCE RMAN.

afzal wrote:
Hi ALL,
WHAT IS THE EXACT DIFFERENCE BETWEEN exipre and obosolete WITH REFERENCE RMAN.As it was mentioned above, obsolete means that the backup is no longer needed according the retention policy. But the expired means that couldn't be found after CROSSCHECK command executed. See the following example. In this example the retention policy is set to redundancy 1 which means that the backup which have more than one copy, is marked as an obsolete. Then I delete a backup, run CROSSCHECK command and see that the deleted backup marked as EXPIRED
RMAN> show retention policy;
RMAN configuration parameters are:
CONFIGURE RETENTION POLICY TO REDUNDANCY 1; # default
RMAN> backup datafile 2;
RMAN> report obsolete;
RMAN retention policy will be applied to the command
RMAN retention policy is set to redundancy 1
no obsolete backups found
RMAN> backup datafile 2;
RMAN> report obsolete;
RMAN retention policy will be applied to the command
RMAN retention policy is set to redundancy 1
Report of obsolete backups and copies
Type                 Key    Completion Time    Filename/Handle
Backup Set           1      30-JAN-11
Backup Piece       1      30-JAN-11          /u01/oracle/product/10.2.0/db_1/flash_recovery_area/TEST/backupset/2011_01_30/o1_mf_nnndf_TAG20110130T131902_6nbc877l_.bkp
RMAN> list expired backup;
RMAN> exit
Recovery Manager complete.
[oracle@linux_server ~]$ rm -rf /u01/oracle/product/10.2.0/db_1/flash_recovery_area/TEST/backupset/2011_01_30/o1_mf_nnndf_TAG20110130T131902_6nbc877l_.bkp
[oracle@linux_server ~]$ rman target /
RMAN> list expired backup;
using target database control file instead of recovery catalog
RMAN> crosscheck backup;
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=159 devtype=DISK
crosschecked backup piece: found to be 'EXPIRED'
backup piece handle=/u01/oracle/product/10.2.0/db_1/flash_recovery_area/TEST/backupset/2011_01_30/o1_mf_nnndf_TAG20110130T131902_6nbc877l_.bkp recid=1 stamp=741791943
crosschecked backup piece: found to be 'AVAILABLE'
backup piece handle=/u01/oracle/product/10.2.0/db_1/flash_recovery_area/TEST/backupset/2011_01_30/o1_mf_nnndf_TAG20110130T131914_6nbc8lh0_.bkp recid=2 stamp=741791954
Crosschecked 2 objects
RMAN> list expired backup;
List of Backup Sets
===================
BS Key Type LV Size       Device Type Elapsed Time Completion Time
1       Full    18.72M     DISK        00:00:03     30-JAN-11
        BP Key: 1   Status: EXPIRED Compressed: NO Tag: TAG20110130T131902
        Piece Name: /u01/oracle/product/10.2.0/db_1/flash_recovery_area/TEST/backupset/2011_01_30/o1_mf_nnndf_TAG20110130T131902_6nbc877l_.bkp
List of Datafiles in backup set 1
File LV Type Ckp SCN    Ckp Time Name
2       Full 516141     30-JAN-11 /u01/oracle/product/10.2.0/db_1/oradata/test/undotbs01.dbf
RMAN>

Difference between mailroutingsmarthost and daemon

I would like to know the difference between mailroutingsmarthost and daemon usage. When to use mailroutingsmarthost and when to use daemon?
Thanks in advance.

MailRoutingSmarthost is placed in LDAP for a domain.
Daemon keyword is for an entire channel, and is used in the imta.cnf
LDAP entries require no restart.
imta.cnf mods require both compile of new config and a restart of the dispatcher to take effect.

Whats the difference between ALL and FIRST in Multi Inserting

SQL> Drop Table Sales;
Table dropped.
SQL> Drop Table Accounts;
Table dropped.
SQL> Drop Table Research;
Table dropped.
SQL> Create Table Sales As Select * From Emp;
Table created.
SQL> Create Table Accounts As Select * From Emp;
Table created.
SQL> Create Table Research As Select * From Emp;
Table created.
SQL> Truncate Table Sales;
Table truncated.
SQL> Truncate Table Accounts;
Table truncated.
SQL> Truncate Table Research;
Table truncated.
SQL> Select * From Sales;
no rows selected
SQL> Select * From Accounts;
no rows selected
SQL> Select * From Research;
no rows selected
SQL> Insert All
2 When Deptno=10 Then
3 Into Sales (Empno,Ename,Job,Mgr,Hiredate,Sal,Comm,DeptNo)
4 When Deptno=20 Then
5 Into Accounts (Empno,Ename,Job,Mgr,Hiredate,Sal,Comm,DeptNo)
6 When Deptno=30 Then
7 Into Research (Empno,Ename,Job,Mgr,Hiredate,Sal,Comm,DeptNo)
8 Select * From Emp
9 .
SQL> /
16 rows created.
SQL> Select * From Sales;
    EMPNO ENAME      JOB             MGR HIREDATE        SAL      COMM    DEPTNO
     7782 CLARK      MANAGER        7839 09-JUN-81       100                  10
     7839 KING       PRESIDENT           17-NOV-81       100                  10
     7934 MILLER     CLERK          7782 23-JAN-82       100                  10
     7999 ABCDEFGH   JOB            7839 09-FEB-06       100         0        10
4 rows selected.
SQL> Select * From Accounts;
    EMPNO ENAME      JOB             MGR HIREDATE        SAL      COMM    DEPTNO
     7901 SMITH      CLERK          7902 17-DEC-80       100                  20
     7566 JONES      MANAGER        7839 02-APR-81       100                  20
     7788 SCOTT      ANALYST        7566 19-APR-87       100                  20
     7876 ADAMS      CLERK          7788 23-MAY-87       100                  20
     7902 FORD       ANALYST        7566 03-DEC-81       100                  20
      123                                                                     20
6 rows selected.
SQL> Select * From Research;
    EMPNO ENAME      JOB             MGR HIREDATE        SAL      COMM    DEPTNO
     7499 ALLEN      SALESMAN       7698 20-FEB-81       100       300        30
     7521 WARD       SALESMAN       7698 22-FEB-81       100       500        30
     7654 MARTIN     SALESMAN       7698 28-SEP-81       100      1400        30
     7698 BLAKE      MANAGER        7839 01-MAY-81       100                  30
     7844 TURNER     SALESMAN       7698 08-SEP-81       100         0        30
     7900 JAMES      MANAGER        7698 03-DEC-81       100                  30
6 rows selected.
SQL> Truncate Table Sales;
Table truncated.
SQL> Truncate Table Accounts;
Table truncated.
SQL> Truncate Table Research;
Table truncated.
SQL> Insert First
2 When Deptno=10 Then
3 Into Sales (Empno,Ename,Job,Mgr,Hiredate,Sal,Comm,DeptNo)
4 When Deptno=20 Then
5 Into Accounts (Empno,Ename,Job,Mgr,Hiredate,Sal,Comm,DeptNo)
6 When Deptno=30 Then
7 Into Research (Empno,Ename,Job,Mgr,Hiredate,Sal,Comm,DeptNo)
8 Select * From Emp
9 /
16 rows created.
SQL> Select * From Sales;
    EMPNO ENAME      JOB             MGR HIREDATE        SAL      COMM    DEPTNO
     7782 CLARK      MANAGER        7839 09-JUN-81       100                  10
     7839 KING       PRESIDENT           17-NOV-81       100                  10
     7934 MILLER     CLERK          7782 23-JAN-82       100                  10
     7999 ABCDEFGH   JOB            7839 09-FEB-06       100         0        10
4 rows selected.
SQL> Select * From Accounts;
    EMPNO ENAME      JOB             MGR HIREDATE        SAL      COMM    DEPTNO
     7901 SMITH      CLERK          7902 17-DEC-80       100                  20
     7566 JONES      MANAGER        7839 02-APR-81       100                  20
     7788 SCOTT      ANALYST        7566 19-APR-87       100                  20
     7876 ADAMS      CLERK          7788 23-MAY-87       100                  20
     7902 FORD       ANALYST        7566 03-DEC-81       100                  20
      123                                                                     20
6 rows selected.
SQL> Select * From Research;
    EMPNO ENAME      JOB             MGR HIREDATE        SAL      COMM    DEPTNO
     7499 ALLEN      SALESMAN       7698 20-FEB-81       100       300        30
     7521 WARD       SALESMAN       7698 22-FEB-81       100       500        30
     7654 MARTIN     SALESMAN       7698 28-SEP-81       100      1400        30
     7698 BLAKE      MANAGER        7839 01-MAY-81       100                  30
     7844 TURNER     SALESMAN       7698 08-SEP-81       100         0        30
     7900 JAMES      MANAGER        7698 03-DEC-81       100                  30
6 rows selected.Both inserting insert the same records then whats the difference between ALL and FIRST clause in multi insert DML
Khurram Siddiqui
[email protected]

Hello
From the docs:
ALL
If you specify ALL, then Oracle evaluates each WHEN clause regardless of the results of the evaluation of any other WHEN clause. For each WHEN clause whose condition evaluates to true, Oracle executes the corresponding INTO clause list.
FIRST
If you specify FIRST, then Oracle evaluates each WHEN clause in the order in which it appears in the statement. For the first WHEN clause that evaluates to true, Oracle executes the corresponding INTO clause and skips subsequent WHEN clauses for the given row.
ELSE clause
For a given row, if no WHEN clause evaluates to true:
* If you have specified an ELSE clause, then Oracle executes the INTO clause list associated with the ELSE clause.
* If you did not specify an else clause, then Oracle takes no action for that row.
See Also:
"Multitable Inserts: Examples"
Restrictions on Multitable Inserts
* You can perform multitable inserts only on tables, not on views or materialized views.
* You cannot perform a multitable insert into a remote table.
* You cannot specify a table collection expression when performing a multitable insert.
* In a multitable insert, all of the insert_into_clauses cannot combine to specify more than 999 target columns.
* Multitable inserts are not parallelized in a Real Application Clusters environment, or if any target table is index organized, or if any target table has a bitmap index defined on it.
* Plan stability is not supported for multitable insert statements.
* The subquery of the multitable insert statement cannot use a sequence.
So given this the following example shows the difference:
SQL> CREATE TABLE dt_test_insert_base as select rownum id from dba_objects where rownum <=20
2 /
Table created.
SQL> CREATE TABLE dt_test_insert_1 (id number)
2 /
Table created.
SQL> CREATE TABLE dt_test_insert_2 (id number)
2 /
Table created.
SQL>
SQL> INSERT ALL
2     WHEN rownum <=15 THEN
3             INTO dt_test_insert_1 (id)
4     WHEN rownum >=10 THEN
5             INTO dt_test_insert_2 (id)
6 SELECT
7     ID
8 FROM
9     dt_test_insert_base
10 /
26 rows created.
SQL>
SQL> SELECT * from dt_test_insert_1
2 /
        ID
         1
         2
         3
         4
         5
         6
         7
         8
         9
        10
        11
        12
        13
        14
        15
15 rows selected.
SQL> SELECT * from dt_test_insert_2
2 /
        ID
        10
        11
        12
        13
        14
        15
        16
        17
        18
        19
        20
11 rows selected.
SQL>
SQL> TRUNCATE TABLE dt_test_insert_1
2 /
Table truncated.
SQL> TRUNCATE TABLE dt_test_insert_2
2 /
Table truncated.
SQL>
SQL> INSERT FIRST
2     WHEN rownum <=15 THEN
3             INTO dt_test_insert_1 (id)
4     WHEN rownum >=10 THEN --This condition is ignored until the value of id is > 15
5             INTO dt_test_insert_2 (id)
6 SELECT
7     ID
8 FROM
9     dt_test_insert_base
10 /
20 rows created.
SQL> SELECT * from dt_test_insert_1
2 /
        ID
         1
         2
         3
         4
         5
         6
         7
         8
         9
        10
        11
        12
        13
        14
        15
15 rows selected.
SQL> SELECT * from dt_test_insert_2
2 /
        ID
        16
        17
        18
        19
        20HTH
David

Difference between Sends and St-Outs

Hello,
I watched a lot of tutorials and read manuals to stereo-outputs and sends (in the mixer). Actually both of them create an aux channel, both are leading through a bus. But whats the difference? I didnt get that because no one tells it explicitely. I understood that you can change the gain of a send to a bus, but is that the only difference? Couldn't I put a reverb not just on a send but also on a st-out?
I really need an on-point explanation
Thank you in advance

IsGu wrote:
I watched a lot of tutorials and read manuals to stereo-outputs and sends (in the mixer). Actually both of them create an aux channel
I don't know which videos or manuals you read, but your conclusion that Sends and Output create Aux Channels can't be further from the truth.
Your question is about the basic understanding of signal routing in general. If you are familiar with reading signal flow diagrams, here is a screenshot from my book "Logic Pro X - How it Works", where I explain in great details the signal flow of audio signals and MIDI signals.
Here is the quick summary:
Aux Send Button: The Aux Sends Button on a Channel Strip lets you route the signal to any of the 64 busses (also referred to as Aux Busses)
Output Button: The Output Button on a Channel Strip lets you route the output signal of a Channel Strip to the Ouput Busses (which represents the output channels on your Audio Interface), but also to any of the 64 Aux Busses. This is useful when you want to create Aux Groups (also referred to as "Audio Groups" or Summing Groups")
Aux Channel Strip: An Aux Channel Strip is a versatile "auxiliary" Channel Strip. On its Input, you can choose one of the 64 Busses or any of the Input channels (and other sources). Its output (like the other Channel Strip types) can be send to an Output Bus or another Aux Bus again.
Please note the difference between the term "Aux Channel Strip" and "Aux Bus", which are two different things.
Hope that helps
Edgar Rothermich
http://DingDingMusic.com/Manuals/
'I may receive some form of compensation, financial or otherwise, from my recommendation or link.'

Difference between parallelism and allocate channel

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