Synchronous writethrough and Asynchronous writethrough cache group

Hi!
My question is that can we use Passthrough feature in sychronous or asynchronous writethrough.
and of which level passthrough=0,1,2,3
please help........
regards
USman

Yes, PassThrough can be used with AWT and SWT cache groups. Any value is allowed but the only values that make sense are 0, 1 and 3. For AWT and SWT, PassThrough=2 is the same as PassThrough=1.
Chris

Similar Messages

Regaring Synchronous communication and ASynchronous Commu

Hi,
Can any please describe me for the above Synchronous communication and ASynchronous Commu. Please don't send any weblogs.. Or Documentations please type the answers in simple language just to understand excatly.
1. when to use these.
2. where to use..
3. How its Usefull

Hi,
When you make a synchronous call i.e the message is sent, the receiving system is active and can accept the call and further process it if necessary.
It is advantageous in a scenario which requires immediate return of data to the sender system.
One example would be where, you create a purchase order with account assignment in the sender system, and you want to perform a budget check in central accounting before you save the purchase order.
A disadvantage would be that both systems are required to be active.
In Asynchronous communication the receiving system does not necessarily have to be available at the time a function call is dispatched from the sender system. The receiving system can receive and process the call at a later time. If the receiving system is not available, the function call remains in the outbound queue of the sending system, from where the call is repeated at regular intervals until it can be processed by the receiving system.
An example would be, you are sending a purchase order to a vendor system. The sending system cannot influence the availability of the receiving system. If the receiving system is not available, the purchase order can be sent repeatedly until the vendor system is available again.
The obvious advantage of async communication is that the receiving system does not have to be available at the time the function call is made and the disadvantage is that processes that require an immediate response to the sender system cannot be executed using this method.
Hope this gives a clear idea of sync n async communication.
Regards,
Chandra

SQL 2012 Synchronous and Asynchronous database limit?

Hi,
How many DB's can be configured as Synchronous commit and Asynchronous commit in SQL 2012 Always On Availability group in a DR scenario for SP 2013?
Thanks
Mohammed Asif Kazi

Maximum number of availability groups and availability databases per computer: The actual number of databases and availability groups you can put on a computer (VM or physical) depends on the hardware and workload, but there
is no enforced limit. Microsoft has extensively tested with 10 AGs and 100 DBs per physical machine. Signs of overloaded systems can include, but are not limited to, worker thread exhaustion, slow response times for AlwaysOn system views and DMVs, and/or stalled
dispatcher system dumps. Please make sure to thoroughly test your environment with a production-like workload to ensure it can handle peak workload capacity within your application SLAs. When considering SLAs be sure to consider load under failure conditions
as well as expected response times.
http://msdn.microsoft.com/en-us/library/ff878487.aspx#RestrictionsAG
Balmukund Lakhani
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This posting is provided "AS IS" with no warranties, and confers no rights.
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Synchronous Writethrough Cache Group in 11.2.1.6.1

Hello,
I have created the following SWT cachegroup -
Cache Group CACHEADM.ENT_GRP_SWT_CG:
Cache Group Type: Synchronous Writethrough
Autorefresh: No
Aging: No aging defined
Root Table: TRAQDBA.ENT_GRP
Table Type: Propagatebased on this DDL
create synchronous writethrough cache group CACHEADM.ENT_GRP_SWT_CG
from
    TRAQDBA.ENT_GRP (
            GRP_REPRESENTATIVE     NUMBER(12) NOT NULL DEFAULT 0,
            GRP_PARENT_KEY         NUMBER(12) NOT NULL,
            GRP_MEMBER_KEY         NUMBER(12) NOT NULL,
            EVIDENCE_KEY           NUMBER,
            NAME_SCORE             NUMBER(3) NOT NULL,
            ADDRESS_SCORE          NUMBER(3),
            DATE_TIME              TIMESTAMP(6),
            ALERT_ID               NUMBER,
            OLD_GRP_REPRESENTATIVE NUMBER(12),
        primary key (GRP_MEMBER_KEY));When I attempt to insert a row into the cachegroup via ttisql I get the following error -
Command> insert into ent_grp values (1,1,1,null,100,null,sysdate,null,null);
5213: Bad Oracle login error in OCISessionBegin(): ORA-01017: invalid username/password; logon denied rc = -1
5131: Cannot connect to backend database: OracleNetServiceName = "TRAQQA.world", uid = "TRAQDBA", pwd is hidden, TNS_ADMIN = "/app1/oracle/network", ORACLE_HOME= "/opt/oracle-local/home/oracle"
The command failed.When connecting to ttisql I supplied the timesten table owner userid and password. I know that if I supply the oracle password at connect time that the insert will work.
I have AWT cachegroups defined, for example -
Cache Group CACHEADM.EXCLUDED_GRP_ENTITY_AWT_CG:
Cache Group Type: Asynchronous Writethrough
Autorefresh: No
Aging: No aging defined
Root Table: TRAQDBA.EXCLUDED_GRP_ENTITY
Table Type: Propagateand I can insert into these cachegroups without the need to supply the oracle password. For example -
Command> autocommit 0
Command> insert into EXCLUDED_GRP_ENTITY values (1,'1',1,1,1,sysdate,1);
1 row inserted.If this behaviour correct? Do I need to supply the oracle password for SWT cachegroups and not AWT cachegroups?
Thanks in advance.
Mark

Hi Chris,
Thanks very much for the information. One other thing we have noticed with the SWT cachegroups that you may be able to comment on - we are using stored procedures in the cache as API's on each of our tables. The stored procedures are owned by the same schema that owns the tables underneath the cache groups. We have an application user that has execute permission on the stored procedures and our java application connects to the application user to execute the stored procedures. We have found when, for example, we insert into the SWT cachegroup via the stored procedures a connection is made to the Oracle server using the userid that owns the stored procedure, not the userid that we have connected to TimesTen with. In our case the connection fails as we are supplying the application users oracle password in OraclePWD and not the schema owners password. Is this the expected behaviour when using stored procedures?
Regards
Mark
Edited by: user557876 on Apr 7, 2011 10:21 PM

Call mode types: Synchronous and Asynchronous in ABAP process for a chain

Hello,
I have a doubt about the call mode type for a abap type process in a process chain. It has two options:
1.Synchronous
2.Asynchronous
Would like to know the diferences between these two; advantages and disadvantages of using them.
Thanks in advance for your help...
Regards,
Anuj

hi anuj,
pls refer the following link.
http://help.sap.com/saphelp_nw70ehp1/helpdata/en/c5/eed63b54e56276e10000000a11402f/content.htm
hope it will help u to understand well the synchronous and asynchronous process chains call mode.
thanks

Different bet Synchronous and Asynchronous

Dear all,
I've been searching in forum and this is what i understand:
Asynchronous indicates that the activity is not complete until a terminating event is received .
When asynchronous methods are executed , workflow does not continue to the next step until it
receives an acknowledgement that the method has finished .
I've tested async method with terminating event and it works as what mentioned above.
On the other hand, I've also tested with Synchronous method with terminating event. And i notice the behaviour is same as async. That's my workflow will not proceed futher until i execute the Synchronous method and eventually trigger the terminating event.
So my question is:
1. What is the actual differences between Sync and Async ?
2. When is right time to use terminating event with Sync and Async?
Kindly comment. Thanks in advance.

Hello,
Terminating event is mandatory for asynchronous task to complete while synchronous task can exists with or without terminating events. Terminating event is optional for synchronous task.
E.g. Say you have work item for leave approval.
A. Above task as asynchronous method with terminating event "Leave_approved".
When user clicks on the above task in workflow inbox, task will open where user can approve leave request. This task will be completed only when terminating event occured in the system. Task will not vanished from inbox if terminating event is not raised.
B.Above task as synchronous method without terminating event .
When user clicks on the above task in workflow inbox, task will open where user can approve leave request. Task will vanished from inbox .
Regards,
Sagar

Is it possible to have a synchronous and asynchronous db connection

I am using an SQLlite database and calling all my queries synchronously. All, but one of the queries is fast, so I was wondering if I could call that one query asynchronously. I created two sqlConnections, one called sync and another async. After making the asynchronous call, I called a synchronous query and got this error:
SQLError: 'Error #3119: Database file is currently locked.', details:'', operation:'execute'
Do asynchronous queries always lock the database? Is it not possible to call more than one query at a time? How does this work for all asynchronous calls? Are the queries queued up and called one at a time?

T-Storm, I'm having the same annoying delay on my X-Fi Extreme Gamer card, it's driving me nuts trying to fix it.
I noticed that if I un-tick the Dolbly Digital Li've in the console it goes away, along with the 5. sound, %$*&^^&%!
Is it he same with you? Try un-ticking the DDL while playing something and see if it stops the delay or not. At least it will see if the problem is the card, the connection, the optical cable, or DDL itself.
Dolby Digital Li've works in real-time so I fear that is causing the delay rather then a bad cable or connection. But I don't know if others are getting the same delay or not, if it is DDL then everyone should be getting it.
But, if they are not trying to play a digital signal at the same time as a anolog one they might not notice it.

Re : what is diffrent Between Synchronies and Asynchronies process

Hi ,
what is diffrent between Synchronies and Asynchronies process in session Method and call Transcation method pls give one Example...
Thanks
Arief .S

Synchronus data processing is that in which the program calling the update task waits for the update work process to finish the update before it continues processing.
In Asynchronus update the callng program does not wait for update work process to finish the update and continues as normal.
A BDC done with sessions is always synchronus.
A BDC with call transaction is by default asynchronus
unless you define it explicitly as
call transaction 'XXXX' ...... update 'S'.
( If you donot define update option it is defaulted to "A" ).
The update method is of importance when one transaction locks data which may be required by a subsequent transaction . The subsequent transaction will fail if data is locked from previous one. An example would be you are creating sales order for same material in succession ( with asynchronus update ). Quite likely that some of transactions would fail due to material locked.
For large volume of data Call Transaction will be faster but you have no restart capability here. Suppose from 1000 transactions 100 fails . You will have to run the BDC program again exclusing the ones which wrere successful. However with session method you have the option to process the error transactions again in SM35 . So if you are sure that errors will not occur use call transaction else use session method.

Synchronous and Asynchronous clarification

Hi,
BDC is synchronous method and Call transaction is Asynchronous method.
If I have 100 records in my internal table(which is uploaded from the flat file) and 50th record is a erronious one.Then in both of the above cases what will happen
What I know,In BDC the 50th record is logged in the log and the rest record from 51st will processed.As BDC is a synchronous method the next data should not be updated database as long as the previous one is updated in database.
Then how the 51st through 100th will updated in the database?
Please explain me.
Thanks,
Partha

Hi,
1.In BDC session ,what you are saying is ok.
Process is asynchronus and update is synchronus.
Till 50 th record is uploaded into the database.
After 50 th record , you need to upload once again by deleting the 1-50 records.
2.In call transaction,NOt like that.error records are goes to BDcmsgcoll and all other are updated in UPDATE mode as A.
3.http://help.sap.com/saphelp_47x200/helpdata/en/fa/09715a543b11d1898e0000e8322d00/frameset.htm
A Asynchronous updating. In this mode, the called transaction does not wait for any updates it produces to be completed. It simply passes the updates to the SAP update service. Asynchronous processing therefore usually results in faster execution of your data transfer program.
Asynchronous processing is NOT recommended for processing any larger amount of data. This is because the called transaction receives no completion message from the update module in asynchronous updating. The calling data transfer program, in turn, cannot determine whether a called transaction ended with a successful update of the database or not.
If you use asynchronous updating, then you will need to use the update management facility (Transaction SM12) to check whether updates have been terminated abnormally during session processing. Error analysis and recovery is less convenient than with synchronous updating.
S Synchronous updating. In this mode, the called transaction waits for any updates that it produces to be completed. Execution is slower than with asynchronous updating because called transactions wait for updating to be completed. However, the called transaction is able to return any update error message that occurs to your program. It is much easier for you to analyze and recover from errors.
Regards,
Shiva.

What is a gateway proxy?? what are synchronous and asynchronous calls?

bapis are rfc enabled. but are there any other rfc's available in sap? what is a gateway proxy?? what are synchronous and asynchronous calls?

Hello:
Lets st art at the beginning.
There are NO documented viruses that affect a Mac running OS X - none (there are instances of Malware).
Gateway GEO-IP/BOTNET Alert
This is a Youtube video that explains what you have (I assume you installed it somehow) on your computer:
http://www.youtube.com/watch?v=JwRi2me2hSk
For openers, I would uninstall any A/V software you have put on your system. It is certainly possible that that junk has put some other stuff on your computer.
I'm also afraid my computer might have been hacked?
Highly unlikely.
Barry

Whats the meaning of Synchronous and Asynchronous Retrieval ?

whats the meaning of Synchronous and Asynchronous Retrieval ?
can you provide any example ?

// async
consumer.setMessageListener( someMessageListenerObject );
// asynchronously someMessageListenerObject will be notified as messages arrive
// sync
Message message = consumer.receive();
// now do something with message
James
http://logicblaze.com/

User exits-- also ---synchronous and asynchronous struc..

dear all
pls. let me know the basics of user exits. i have gone thro williams iam unable to follow. does it require abap knowledge. i sincerely request one and all (experts) to let me know about user exits. it seems very imp as per interviews.
also what is synchronous and asynchronous structures whats the difference. can anybody share knowledge on this.
thanks in advance
regards

Dear Sekhar,
Please find the info regarding User-Exit's in the following links:
http://help.sap.com/saphelp_nw04/helpdata/en/bf/ec07a25db911d295ae0000e82de14a/frameset.htm
http://www.sap-img.com/abap/a-short-tutorial-on-user-exits.htm
Re: doubt on user exits
user exits and Badis
User exits is the enhancements provided by SAP
You can use them in transactions. Each transaction will have user exits.
If you want to use your own requirements by making your coding while the transaction is run you can use user exits.
For example if you want to run the MRP in MD02 specific to MRP controller you can user exit.
Please also refer the document below.
USEREXIT
Userxits allow us to add our own functionality to SAP standard program
without modifying it . These are implemented in the form of subroutines and hence are also known as FORM EXITs. The userexits are generally collected in includes and attached to the standard program by the SAP.
All Userexits start with the word USEREXIT_...
FORM USEREXIT_..
z..
ENDFORM.
The problem lies in finding the correct userexit and how to find it if one exists for the purpose. Once the correct userexit is found the necessary customer code is inserted in the customer include starting with the z.. in the form routine.
e.g. USEREXIT_SAVE_DOCUMENT_PREPARE
Certain application like SD still provide this form of enhancement using userexit but this practice is no longer being followed for newer extensions instead they are using EXITs which come bundeled in enhancement packages . Neverthiless existing USEREXITS will be supported by SAP an all the newer versions of SAP.
HOW TO FIND USEREXITS
Userexits can be found in number of ways:
1) To find userexits in SD module , goto object navigator(SE80) and select
development class from the list and enter VMOD in it. All of the userexits in SD are contained in the development class VMOD. Press enter and you will find all the includes which contain userexits in SD for different functions like PRICING, ORDER PROCESSING etc. Select the userexit according to the requirement and read the comment inserted in it and start coding .
Some examples of userexits in SD(SALES & DISTRIBUTION ) are:
1)ADDING OF NEW FIELDS IN PRICING
In Pricing in SD the fields on the basis of which pricing is done are derived from the FIELD CATALOG which is a structure KOMG .This structure is used to transfer transaction data to the pricing procedure in SD and is also known as communication structure.This structure KOMG consists of two tables KOMK for Header related fields and KOMP for item related fields. The fields which are not in either of the two tables KOMK and KOMP cannot be used in pricing .Sometimes a need arises when the pricing is to be based on some other criteria which is not present in the form of fields in either of the two tables. This problem can be solved by using USEREXITS which are provided for pricing in SD. Pricing takes place both when the SALES ORDER ( Transaction VA01) is created as well as when INVOICING ( Transaction VF01) is done.Hence SAP provides 2 userexits ,one for sales order processing which is
USEREXIT_PRICING_PREPARE_TKOMP or
USEREXIT_PRICING_PREPARE_TKOMK
Depending upon which table (KOMK or KOMP) the new fields were inserted we use either of the above two userexits.These userexits are found in include MV45AFZZ of the standard SAP sales order creation program SAPMV45A.
In the case of userexit which will be called when invoicing is done ,these
are provided in the include RY60AFZZ which is in the standard SAP program SAPMV45A. The name of the userexits are same. i.e
USEREXIT_PRICING_PREPARE_TKOMP or
USEREXIT_PRICING_PREPARE_TKOMK
These userexits are used for passing the data from the communication structure to the pricing procedure, for this we have to fill the newely created field in the communication structure KOMG for this we fill the code in the above userexit using the MOVE statement after the data that has to be passed is taken from the database table by using the SELECT statement. The actual structure which is visible in these userexits and which is to be filled for that particular field is TKOMP or TKOMK.
Before the coding for these userexits is done ,it is necessary to create a new field in either of the two tables KOMK or KOMP .For this purpose includes are provided in each of them .
To create the field in header data(KOMK) the include provided is KOMKAZ
and to create the field in item data(KOMP) the include provided is KOMPAZ.
One possible example for the need of creating new fields can be e.g. Frieght to be based upon transportation zone ,for this no field is available in field catalog and hence it can be created in KOMK and then above userexits can be used to fill the transportation data to it.
2)The other method of finding userexit is to find the word USEREXIT in the
associated program of the transaction for which we want to determine userexit using SE38.
3)The other method of finding userexits is to find the include in case of SD/MM applications where the userexits are located ,this can be found in the SAP reference IMG generally in the subfolder under SYSTEM MODIFICATION.
Some other examples of userexits in SD are:
USEREXIT_NUMBER_RANGE
This userexit is used to assign a different internal document number to the
sales order(VA01) when it is created depending on some criteria like a different SALES ORGANIZAION(VKORG) .
USEREXIT_SAVE_DOCUMENT_PREPARE
This userexit is used to insert the ABAP code which will be called when
the document (sales order VA01) is just about to be saved.This userexit is used generally for custom checks on different fields , to display some information before the order will be saved or for making changes to certain fields before the sales order will be saved.
Exits & Enhancements
There are mainly six types of EXITs in sap which have been collected in the form of enhancement packages and attached to standard code in SAP.
These are different from USEREXIT in the way that they are implemented
in the form of FUNCTIONs while in USEREXITS we use form routines for their implementation. These are also sometimes known as function exits .
These start from the word EXIT_ followed by the program name and then followed by a three digit number.
e.g. EXIT_SAPMV45A_002
This exit is found in SD in enhancement V45A0002.
TYPES OF EXITS
1)MENU EXITS
2)FUNCTION EXITS
3)TABLE EXITS
4)SCREEN EXITS
5)KEYWORD EXITS
6)FIELD EXITS
We use SAP transactions CMOD and SMOD to manage exits. Before implementing an exit , it is required to create the project by using CMOD
selecting the enhancement e.g. V45A0002 and selecting the component
(one which fulfills our need) i.e the exit which will be implemented in SMOD and after coding has been done the project has to be activated.
An exit can be coded only once.
FUNCTION EXITS
These are used to add functionality through ABAP code . These start from the word EXIT_programname_NNN ending in a 3 digit number. No access code is required to implement any tupe of exit including function exits.
The function exits are called from the standard SAP program in the form
of ABAP statement
CALL CUSTOMER-FUNCTION 'NNN'
This is in contrast to USEREXITs where PERFORM statement is used to call
the required userexit.
To implement the FUNCTION EXITs first of all the project is created and a suitable enhancement package is selected and from its compnents the function exit to be implemented is selected and on double clicking it the exit code will appear in ABAP EDITOR(se38) where a Z include will be found and the customer code should be entered in this include.
e.g.
ADDING A DEFAULT SOLD-TO-PARTY in Sales Order Creation
To show a default sold-to-party in this field when the user creates a sales order (VA01) we can use a function exit .This function exit is located in enhancement no V45A0002 . Before we can choose the exit we have to create a project in CMOD after that enter V45A0002 in the enhancement field and click on the components . In the components you will see the exit EXIT_SAPMV45A_002 . This exit is used for our purpose.
Double clicking on this exit will takes us to function builder (SE37) . This
function exit has one exporting parameters and two importing parameters, we are interested in exporting parameter which is E_KUNNR of type KNA1-KUNNR i.e if we move the desired customer name to this structure(E_KUNNR) it will be shown in the field as the default value when we create the sales order. This function also contains a customer include ZXVVA04 . This include will be used to write our custom code .
Double clicking on this include and it will prompt us that this include does not exists do you want to create this object ,select yes and the include will be created .In this include we can write our own code that will fill the field E_KUNNR.
e.g. E_KUNNR = 301.
Activate the include and Activate the project. Now when ever the SALES ORDER will be created , sold-to-party field will come up with a predefined customer .
FIELD EXITS
The field exits are managed,created,activated through program RSMODPRF. The field exit is associated with a data element existing in ABAP dictionary and hence to the screen field using that data element.
The format of field exit is :
FIELD_EXIT_dataelement_A-Z or 0-9
If a particular screen and program name is not specified than the field exit will effect all the screens containing that data element.
The function module associated with field exit shows two parameters
INPUT and OUTPUT. Input parameter contains the data passed to the field exit when the field exit was invoked by the R/3 , We can write our own code to change the output parameter depending upon our requirements.
Before the field exit can have any effect the system profile parameter
ABAP/FIELDEXIT in all the application servers should be set to YES
ABAP/FIELDEXIT = YES.
Regards
Naveen.

What is synchronous and asynchronous FM calls

Hi All,
   Can you tell me that what is synchronous and asynchronous FM calls?
   Full points will be rewarded for the answer of this simple question !!
Best Regards,
Chandan Dubey

Hi Chandan,
     You can refer the below document for a good explanation.
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/f078394a-4469-2910-c4bf-853c75674694
Thnaks,
Siva.

Difn Betn synchronous and asynchronous procsesing an update

Hi gurus.
Can any body tell me Difn Betn synchronous and asynchronous procsesing an update .
Regards ,
Mahesh

hi,
For Update you have
A - asynchronus - does not wait for next update in the queue
S - Synchronus - waits until the previous update is completed before a new request is considered
L - Local update - Uses a different work process to trigger call function in update task.
In synchronus method until one record process takes place into database next record will not be processed.
In asynchronus immedate updation of data into database table.
Check this link for more detailed information:
http://fuller.mit.edu/tech/sync_asynchronous.html
'A', 'S' and 'L' are the update modes in CALL transaction method.
I will give you a simple example to explain this.
Suppose that there are 30 records in total and an error has occured in the 5th record.
In asynchronous, update is done for every 30 records while in synchronous one,
update is done only upto the 4th record.
So only after the record in the fifth one is eliminated, remaining others are processed.
Have a look at this URL from SAP Help:
http://help.sap.com/saphelp_46c/helpdata/en/41/7af4cba79e11d1950f0000e82de14a/frameset.htm
Regards
Anversha

Meaning of synchronous and Asynchronous in BDC

Hi Guys,
1) What is a maning of synchronous and Asynchronous in BDC, what is a diffrence betwwen both?
2) Can you please provide ABAP OOPS real time question and answer?
Thanks
Jigar

in simple,
Synchronous:
- COMMIT WORK AND WAIT:
-System waits until the database updation is completed.....then, system continues to execute after the piece.....if some thing wrong in updation, then, the rest piece do not executes!!
-here, we get sy-subrc return value, so, some times, we can write rest prog. based on this retun value, either sucess or failure, like in some scenarios, we write CALL TRANSACTION with 'S', other wise its normally, Asynchronous!!
- takes more time
-mostly, batch input
-example, say, there is Materail doc posting and associated accouting doc posting.....so, if material doc is successful, then only acc. doc will be get posted
Asynchronous:
-COMMIT WORK
-does not depend on the updation
-quick relatively
-mostly CALL TRANSACTION
- no return code
for further, pls. go thru SDN
thanq

Synchronous writethrough and Asynchronous writethrough cache group

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