Top 100+ Sap Rfc Interview Questions And Answers
Question 1. What Do You Mean By Rfc? Explain In Detail?
Answer :
RFC stands for Remote Function Call. Remote Function Call is an interface for verbal exchange between a SAP System and other SAP or 1/3-celebration well suited machine. Remote characteristic calls may be associated with SAP software program and ABAP programming and offer a manner for an outside application (written in languages along with PHP, ASP, Java, C, C++) to use information returned from the server or insert data into server statistics.
For commercial enterprise programs, every so often it turns into necessary to speak and trade statistics (in predefined formats) with other SAP Systems or non-SAP Systems (Example Visual Basic to SAP, Java to SAP and so forth.). To enable this communique, SAP has supplied us with a mechanism called RFC, which stands for 'Remote Function Call'.
RFC’s can be used for outside integration with SAP, inclusive of PHP/SAP, Flex/SAP, Ruby/SAP, and so forth.
In SAP, RFC Interface system is used for placing-up RFC connections among different SAP structures, and additionally among an SAP and an outside (Non SAP) device.
Say for example, If you have VB gadget which has your enterprise's Inventory Management & you've got FICO / SD / MM / PP in you SAP system. Your VB Inventory mgmt machine wants to send or receive statistics/update database in SAP. This can be done use RFC.
Although an RFC related to communique between two special structures, it can additionally be created for communique within a machine.
RFC’s can be created or maintained via transaction code SE37. RFC calls a characteristic to be finished in a far off gadget. SM59 transaction code can be used to define and hold the logical destination of RFC.
Question 2. What Is An Rfc Interface? What Are The Types Of Rfc Interface?
Answer :
The RFC interface affords the capability to name far flung capabilities. In SAP, RFC Interface gadget is used for placing-up RFC connections between distinctive SAP systems, and also between an SAP and an external (Non SAP) gadget.
RFC consists of interfaces:
a) Calling interface for ABAP Programs: Any ABAP program can call a far off function using the CALL FUNCTION...DESTINATION assertion. The DESTINATION parameter tells the SAP System that the known as characteristic runs in a gadget apart from the caller's.
Syntax:
CALL FUNCTION <‘RFC_Name’>DESTINATION
EXPORTING
f1 =
IMPORTING
f2 =
TABLES
t1 =
EXCEPTIONS
.
B) Calling Interface For Non-SAP applications: If either the calling program or the called accomplice is not an SAP program, this system in query have to be programmed in this sort of way that it may play the position of the other accomplice in RFC communication. RFC-supported and GUI-supported interfaces may be utilized by external programs to call function modules in SAP structures, and execute them in these structures. Likewise, ABAP applications also can use those interfaces to apply functions supplied by outside packages. Connectors may be used to obtain the identical, as an example SAP Java Connector (JCo) or SAP .Net Connector.
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Question 3. What Are The Functions Of Rfc Interface?
Answer :
Some of the capabilities of the RFC interface are:
Calling the communication routines wished to speak to the far off gadget.
Converting all parameter statistics to the representation wished inside the faraway machine
Handling communications mistakes, and notifying the caller, if preferred (using EXCEPTIONS parameter of the CALL FUNCTION).
Question four. Explain A Scenario Where There Will Be A Need Of Using Rfc?
Answer :
RFCs aren't handiest used for outside get entry to to SAP systems but additionally for interconnections of SAP structures. For instance, if there may be a Central User Administration (CUA) established in an SAP gadget landscape, then there could be want of RFC destination to all daughter systems of the CUA system.
Say we have CRM and R/three System. In CRM we cannot recognize whatever approximately transport fame of income orders. In such instances RFC's may be used to retrieve transport popularity of sales orders from R/3 Server. In This way CRM server can get facts or statistics concerning Delivery repute of Sales Orders.
An important state of affairs which calls for RFC is Application Link Enabling (ALE). Let's assume there is a Master Data Management (MDM) system and we want to distribute the master information to all SAP systems which would require access to master statistics. For such eventualities, ALE can be used to distribute the grasp information some of the extraordinary SAP systems using IDocs. ALE in turn uses RFC to set up a connection between MDM and its daughter machine in this state of affairs.
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Question five. What Are The Advantages Of Rfc – Remote Function Call?
Answer :
RFC helps to lessen the efforts of programmers, via letting them avoid the re-improvement of modules and strategies at faraway systems. It is succesful enough to:
Convert the records into the layout comprehensible through the remote (goal) gadget.
Convert the data into the layout comprehensible by the far off (target) system.
Call up sure workouts which can be essential to begin conversation with remote gadget.
Handle mistakes that could arise within the system of conversation.
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Question 6. For What Purposes Can Rfc’s Be Used?
Answer :
RFCs can be used for the subsequent noted purposes:
To establish Communication between special systems, such as among two SAP structures or between an SAP device and an outside system.
To set up Communication between application instances or among the software layer and the presentation layer (GUI communication).
Can be Used for Parallelizing Processes as one application after every other can start several RFCs asynchronously without looking ahead to processing to complete, RFCs are used to parallelize procedures and dynamically distribute workload over the distinctive servers within an SAP device.
Question 7. State Whether Rfc’s Are Client Dependent Or Client Independent Objects?
Answer :
RFC’s are Client Independent Objects. RFC connections can continually be used throughout the complete device. This approach that an RFC connection you've got described in client a hundred also can be used from customer a hundred and ten additionally without any distinction.
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Question eight. What Are The Types Of Rfc’s Available In Sap System?
Answer :
There are 5 styles of RFC’s available in SAP System. They are:
Synchronous RFC (sRFC)
Asynchronous RFC (aRFC)
Transactional RFC (tRFC)
Queued RFC (qRFC)
Parallel RFC (pRFC)
Question nine. How Are Rfc’s Executed? In Background Or Dialog Work Processes?
Answer :
All RFCs, whether synchronous, asynchronous, or transactional, are started in conversation work approaches. Don’t get deceived by using the syntax IN BACKGROUND TASK; this has not anything to do with historical past paintings approaches. Transactional RFCs are also achieved in dialog paintings approaches.
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Question 10. State Some Factors That Can Increase The Response Time Of An Rfc Connection Between Two Systems?
Answer :
The response time for the transfer of records relies upon on the network used. Ideally, the reaction time have to be between 10 and 100 milliseconds.
High response times may be because of the subsequent 3 things
The network connection is usually gradual or overloaded.
The recipient system is physically overloaded.
Too few strategies are configured inside the recipient machine to obtain RFCs.
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Question 11. What Is Synchronous Rfc (srfc)?
Answer :
Synchronous Communication is implemented whilst there is a want for immediate go back of records (response) from the receiving system to the sender machine. The receiving gadget must be energetic on the time this communique is made so that it can system the function name at that very time. This communication may be very helpful while real time response is required or when outcomes are required straight away from the vacation spot machine.
Synchronous RFC is primarily based on synchronous verbal exchange this means that both the supply machine and vacation spot device (Client & Server) concerned must be to be had on the time feature name is made.
SRFC is a means of communication between structures wherein acknowledgements are required. The assets of the Source System wait at the goal machine and make sure that they deliver the message/information with ACKD. The Data is consistent and dependable for communique.
The most effective issue is if the target gadget isn't always to be had, the supply machine assets wait until goal system is available which may cause the Processes of source system to go into Sleep/RFC/CPIC Mode at goal structures and for this reason blocks these sources.
Synchronous RFC may be used for
For conversation among structures.
For verbal exchange among SAP Web Application Server to SAP GUI.
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Question 12. What Is Asynchronous Rfc (arfc)?
Answer :
Asynchronous RFC is primarily based on asynchronous conversation this means that the receiving device may additionally or might not be capable of retrieve the feature name request crafted from the sender system. The function name can be processed at a later time when the receiving system receives available. Till that point the feature call remains in an outbound queue of the sending gadget and the decision is repeated at everyday intervals until the receiving machine receives to be had to procedure the request.
The advantage of this verbal exchange is that the receiving gadget want not be available all of the time to technique the request specifically in cases wherein the receiving gadget is quickly unavailable like because of upgrade or another motive.
ARFC is a means of communication between structures wherein acknowledgements are not required (it's miles just like post card shipping).It doesn't require both the structures to be to be had at the time of execution and the end result is not without delay required to be despatched lower back to calling system.
The Source System aid does now not watch for the target system as they deliver the message/records with out expecting any acknowledgement. It isn't always dependable for communique for the reason that statistics can be lost if the target machine isn't always to be had.
Asynchronous RFC may be used for
For communication between structures.
For parallel processing jobs.
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Question thirteen. What Is Transactional Rfc (trfc)?
Answer :
To make the execution of RFC features reliable, secure and independent from the supply of the RFC server or RFC server device, the transactional RFC (tRFC) are used. This guarantees that the known as characteristic module is completed only as soon as inside the RFC server system.
If an mistakes takes place at some stage in a synchronous far flung characteristic name, the gadget can't inform at what point the error befell (most crucially, whether or not the function module changed into absolutely processed in R/3 before the operation failed). Restarting a failed name is consequently a dangerous aspect to do, considering that there may be a danger of duplicating a finished feature name.
In Such instances, tRFC’s may be used which guarantees that each function name issued will be performed only once, although the call is submitted time and again to the R/three System. The machine implements this protect by using assigning a unique transaction ID (TID) to every transaction that you post. When you try and technique the transaction, the system tests whether or not that TID has already been processed or no longer. If it has, the transaction is neglected.
TRFC is an extension of aRFC. Transactional RFC is an asynchronous verbal exchange technique that executes the known as function module in the RFC server simplest once, even if the records is sent multiple times because of a few community issue. The far flung machine need now not be available on the time whilst the RFC consumer program is executing a tRFC.
The tRFC thing stores the known as RFC function, together with the corresponding data, within the SAP database under a unique transaction ID (TID). TRFC is just like aRFC as it does now not wait at the goal machine (Similar to a registered post). If the gadget isn't available, it will write the Data into aRFC Tables with a transaction ID (SM58) that is picked via the scheduler RSARFCSE (which runs for each 60 seconds).
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Question 14. What Is Queued Rfc (qrfc)?
Answer :
When transactional RFC’s are used, there may be no guarantee of the order in which the feature calls will be processed inside the system (it's far quite possible that one name may overtake some other). For instances in which there's a want to specify a specific processing order, Queued RFC can be used.
QRFC is an extension of tRFC. In qRFC, you location every function name in a logical queue. A feature name cannot be accomplished until all of its predecessors in the queue had been processed. Queued RFC calls are processed asynchronously.
QRFC are to be preferred when there is a want of guarantee that numerous transactions are processed in a predefined order or whilst there may be a need of assure that a couple of LUWs (Logical Unit of Work/ Transaction) are processed within the order designated through the application.
QRFC guarantees that the transaction is dedicated primarily based on FIFO Queue. It ensures transaction consistency of LUW and reliability of statistics transmission. The device shops the queue specifications in desk TRFCQOUT. With every COMMIT WORK, the device determines a counter that is used to maintain the collection of transaction processing.
SMQ1: To reveal the outbound queues of a sending machine refer SCOT for Fax.
SMQ2: Provides interface to monitor inbound queues.
Question 15. What Is The Disadvantage Of Using Queued Rfc (qrfc)?
Answer :
If, for instance, due to community/verbal exchange troubles the first LUW in a queue can not be completed, now not handiest this queue continues pending, however also all other LUWs which can be interdependent with this queue. The ensuing "jam" should motive a database problem. However, as soon because the communique hassle is solved, all transactions and for that reason all queues may be processed mechanically one after the other.
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Question sixteen. What Is Fast Rfc (frfc)?
Answer :
Fast RFC is a kind of RFC used for device internal communications. Interactions among J2ee engine in SAP & the ABP runtime surroundings within the equal instance are executed using Fast RFC. This kind of RFC is feasible best if each the source & target are on the identical gadget.
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Question 17. What Is Parallel Processing In Rfc (prfc)?
Answer :
Parallel Processing is an extension of aRFC. Generally while we name a feature module, it'll stop the modern-day software, execute every other (known as) program and then returns manage to original software and again unique application starts execution.
With asynchronous feature module manipulate will begin parallel with out stopping the current software from that you called the function module. Parallel processing is usually used while there's a need to manner massive amount of information.
In parallel processing, a activity step is started out as traditional in a history processing work method. A program that runs in a activity step can be programmed to apply a unique variation of asynchronous RFC to have portions of the facts to be processed run in parallel in different paintings strategies. You can understand any such application by its use of the CALL FUNCTION STARTING NEW TASK DESTINATION IN GROUP coaching to begin the characteristic modules that manner the data.
While the process itself runs in a heritage method, the parallel processing tasks that it starts offevolved, run in dialog paintings processes. Such dialog work procedures can be positioned on any SAP server. Parallel processing has been implemented in a few SAP applications that have lengthy-walking reviews.
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Question 18. What Are The Features Of Transactional Rfc (trfc)?
Answer :
Some of the salient features of tRFc are:
tRFC guarantees that a called characteristic module is done inside the goal device exactly as soon as.
All tRFC calls terminated with the declaration COMMIT WORK belong to 1 LUW (Logical Unit of Work). Each LUW automatically gets a transaction ID.
Within an LUW, all function modules are accomplished in the target system within the sequence in which they are called inside the send device.
TRFC calls with the addition AS SEPARATE UNIT map a separate LUW every in the goal machine. Such a sub LUW includes exactly one tRFC call and is processed unbiased of the actual (advanced) LUW. This sub LUW gets its own transaction ID.
If within an LUW numerous locations are used, all tRFC calls that belong to one destination additionally shape a sub LUW. However, in view that this bundling takes place only internally, there is no separate transaction ID assigned to the sub LUW.
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Question 19. What Are The Disadvantages Of Transactional Rfc (trfc)?
Answer :
Some of the hazards of tRFC are:
tRFC techniques all LUWs unbiased of each other. Due to the quantity of activated tRFC processes, this process can reduce performance substantially in both the ship and the target structures.
In addition, the sequence of LUWs described in the utility can't be kept. Therefore, there is no assure that the transactions are done in the collection dictated by means of the software. The best assure is that every one LUWs are transferred finally.
Question 20. What Do You Mean By The Terms Rfc Client & Rfc Server?
Answer :
RFC customer is the instance that calls up the Remote Function Call (RFC) to execute the function that is provided by way of an RFC server. The process that starts the RFC is known as the sender or customer, and the procedure in which the RFC is carried out is the recipient or server.
Say we have CRM and R/three System. If we want to study Sales Order’s Delivery Status file from R/three System’s database, we can should create a remotely callable characteristic module inside the R/three surroundings which retrieves Sales Order’s Delivery Status statistics. Now we will have to name this characteristic from the CRM System the use of a far flung characteristic name (Also list the vacation spot for the target R/three System in SM59). In this case CRM server acts as an RFC Client and R/three acts as an RFC Server.
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Question 21. What Do You Understand By The Term Destination Used In Rfc?
Answer :
CALL FUNCTION RemoteFunction DESTINATION Dest
EXPORTING
f1 =...
F2 =...
IMPORTING
f3 =...
TABLES
t1 =...
EXCEPTIONS......
The area 'Dest' can be either a literal or a variable. Its cost is a logical vacation spot (as an example,
"CRM110") recognised to the nearby SAP System. Logical locations are defined the use of transaction SM59 and the corresponding data is stored in general database table RFCDES.
The far off function name idea, for example, permits you to get entry to a characteristic module in an R/3 System from an ABAP application in a CRM System. If you want to read Sales Order’s Delivery Status report from your R/three System’s database, create a remotely callable characteristic module inside the R/3 surroundings which retrieves Sales Order’s Delivery Status record. Call this feature out of your CRM System the use of a far off feature call and list the vacation spot for the goal R/3 System:
CRM System: Client
CALL FUNCTION ‘RFC_SALES_DEL_STATUS’
DESTINATION ‘R10’
EXPORTING VBELN = SALESNO
TABLES STATUS_T = IT_TAB
EXCEPTIONS NO_RECORD_FOUND = 01.
R/three System: Server
FUNCTION RFC_SALES_DEL_STATUS.
.... (Read Sales Order’s Delivery Status file)
ENDFUNCTION.
Question 22. How Parameter Handling Is Different For Remote Function Calls & Local Function Calls?
Answer :
In Remote Function Calls, The actual table is transferred, however no longer the desk header. If a desk parameter isn't always particular, an empty table is used inside the referred to as characteristic.
Internal ABAP tables may be used as parameters for characteristic module calls. In a neighborhood feature module name, a parameter desk is exceeded on through reference, and no new neighborhood replica has to be created. RFC does not help the ‘by way of reference’ mechanism, so the whole table has to be exchanged between the RFC customer and the RFC server. When the RFC server receives the desk entries, it creates a local replica of the internal table.
Question 23. Can We Call Remote Function Calls Locally?
Answer :
Sometimes there might be a need to call a far off feature name from inside the equal device. This feature can run either as a far off or a local call, depending on the CALL FUNCTION declaration on how it's far declared. It’s a recognised reality that parameter coping with are distinctive for Remote Function Call and Local Function Call, so whether or not the call runs as far flung or local the parameter dealing with receives affected adversely.
We can call far flung features calls domestically the usage of methods.
CALL FUNCTION...DESTINATION = 'NONE'
This is a far flung name, despite the fact that DESTINATION = 'NONE' way that the faraway feature will run within the equal system because the caller. As a faraway call, the feature module runs in its very own roll place, and parameter values are treated as for different faraway calls
CALL FUNCTION ‘RFC_SALES_DEL_STATUS’
DESTINATION ‘NONE’
EXPORTING VBELN = SALESNO
TABLES STATUS_T = IT_TAB
EXCEPTIONS NO_RECORD_FOUND = 01.
CALL FUNCTION... [no DESTINATION used]
This is a neighborhood call, despite the fact that the function module is registered as faraway. The module does now not run in a separate roll region, and is largely like a normal feature call. Parameter transfer is treated as for ordinary function modules. In unique, if the decision leaves a few EXPORTING parameters unspecified, it terminates abnormally.
CALL FUNCTION ‘RFC_SALES_DEL_STATUS’
EXPORTING VBELN = SALESNO
TABLES STATUS_T = IT_TAB
EXCEPTIONS NO_RECORD_FOUND = 01.
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Question 24. Can A Server System Call Remote Function Of Client System Back Or When To Use Destination ‘back’?
Answer :
In trendy, the purchaser and the server are determined at the start of an RFC. While a feature is being processed on the server, this server can call a far off function at the client. In different phrases, the faraway characteristic can invoke its personal caller (if the caller is itself a far off characteristic module), or any far off feature module loaded with the caller. The known as-again characteristic then runs in the identical software context because the authentic caller.
This name-again mechanism may be triggered with the aid of the use of the unique vacation spot call ‘BACK’. If this call is specified in an RFC call on the device acting as the server, the system uses the same RFC connection that became established when the server received the first call. Once an RFC connection is installed, it's miles maintained till it's miles either explicitly closed or till the calling program terminates. During a name-lower back, the gadget will constantly try to use present RFC connections earlier than establishing a new one.
To perform a call-lower back, the syntax is:
CALL FUNCTION... DESTINATION 'BACK'
In the beneath screenshot, remote function B of System B invokes faraway function A in the calling System A.
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Question 25. How Can You Differentiate Types Of Rfc By Syntax In An Abap Program?
Answer :
Basically RFC’s may be diagnosed in an ABAP application via the syntax CALL FUNCTION <rfc name=' '> DESTINATION <destination name=' '>.
If the RFC function name consists of the clause STARTING NEW TASK, it's miles an asynchronous RFC; the clause IN BACKGROUND TASK suggests a transactional RFC. If the call handiest incorporates the clause DESTINATION, however neither STARTING NEW TASK nor IN BACKGROUND TASK, then the RFC is began as a synchronous RFC.
The following code starts the functional module ZRFC_SALES_DEL_STATUS synchronously, asynchronously, and transactionally.
* Synchronous RFC
CALL FUNCTION ‘ZRFC_SALES_DEL_STATUS’
DESTINATION ‘R10’
EXCEPTIONS
argument_error = 1
send_error = 2
OTHERS = three.
* Asynchronous RFC
CALL FUNCTION ‘ZRFC_SALES_DEL_STATUS’
STARTING NEW TASK project
DESTINATION ‘R10’
EXCEPTIONS
communication_failure = 1
system_failure = 2
RESOURCE_FAILURE = three.
* Transactional RFC
CALL FUNCTION ‘ZRFC_SALES_DEL_STATUS’
IN BACKGROUND TASK
DESTINATION ‘R10’
COMMIT WORK.
Question 26. What Do You Mean By Trusted Rfc Connections? What Are The Advantages Of It?
Answer :
While defining RFC vacation spot through tcode SM59, there may be an choice to make the RFC connection as 'Trusted'. Once decided on, the calling (trusted) gadget would not require a password to connect with target (trusting) machine.
Following are some of the benefits of the use of trusted channels:
Cross-machine Single Sign-On facility.
Password does no longer want to be despatched across the network.
Timeout mechanism for the log-on information prevents misuse.
Prevents the mishandling of log-on records due to the time-out mechanism.
User-specific log-on info of the calling/depended on machine is checked.
The RFC customers have to have the required authorizations within the trusting machine (authorization object S_RFCACL).Trusted connections are frequently used to connect SAP Solution Manager Systems with other SAP systems.
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Question 27. What Are The Different Testing Options Available For Rfc Connection?
Answer :
Different testing alternatives available for RFC connection are:
Connection take a look at.
Authorization check.
Unicode Test.
Remote Logon Test
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Question 28. How To Debug A Remote Function Call (rfc)?
Answer :
METHOD 1:
Suppose you need to debug a characteristic module which is there in SRM/APO device from R/three.
(FYI: As you all recognise this RFC Destination is maintained through transaction code SM59 )
Keep the external smash-point in your calling program earlier than it calls the RFC. Now login into the Destination system where you’re faraway enabled function module exist and placed an outside destroy-factor.
Now go to Transaction code SRDEBUG and click on on the Activate Debugging Button: It will come up with a pop up which affirm your identity, application server and many others.
Click input in order to provide you with another popup. Keep it as it's far.
Now go to your Report software in source device and Execute it , it's going to open debugger , when you press F5 key to go within the RFC Function module it's going to start debugging in APO gadget.
METHOD 2. Calling a custom RFC
Three steps wishes to be followed.
For example we're calling an RFC enabled FM in ECC device from CRM gadget.
Add an countless loop in the far off custom Function Module (including a “DO. ENDDO.” announcement at the start of the FM might be enough).
Execute your application in the CRM system. The execution stops on the RFC call, because of the infinite loop.
Now login to the ECC gadget and visit transaction SM50 pick the procedure that's executing the RFC and navigate to the menu: “Program/Session->Program->Debugging” this triggers the debugger session in a separate window.
Question 29. What Are The Types Of Remote Communications ?
Answer :
communications among impartial SAP System
consumer-server communications between an outside consumer and an SAP System performing as the server
consumer-server communications among an SAP System appearing because the customer and an outside server.
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Question 30. What Is Ole ?
Answer :
For Windows frontends, SAP affords interfaces primarily based on Microsoft's Object Linking and Embedding technology (OLE Automation).
Question 31. What Is Rfc?
Answer :
A far off characteristic name is a name to a function module going for walks in a machine distinctive from the caller's. The far flung feature can also be known as from within the identical system (as a far flung call), but normally caller and callee may be in special structures.
Question 32. How Is Abap/4 Used As Ole Automation Controller ?
Answer :
An ABAP/4 program can call up an OLE Automation Server (along with Excel) on the desktop. The ABAP/four OLE Automation Controller includes a hard and fast of ABAP/four language elements that an ABAP/four purchaser application can use to force an OLE Automation server on either Windows or Apple Macintosh frontends.
Question 33. What Is The Statement Used For Calling Rfc In Abap/4 Programs?
Answer :
Any ABAP/four program can name a far flung characteristic using the CALL FUNCTION DESTINATION announcement.
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Question 34. Destination Parameter Are Defined In Which Table?
Answer :
Logical locations are described in the RFCDES table (or the TRFCD desk in R/2 Systems) via transaction SM59
Question 35. How To Call Interfaces For Non-sap Programs ?
Answer :
To help implement RFC accomplice packages in non-SAP Systems, SAP offers :
- The RFC Generator to create stub packages External Interfaces
Question 36. What Is Rfc Generator ?
Answer :
The characteristic library in R/three provides a facility for generating and then downloading RFC programs to a pc or PC. This facility is the RFC Interface Generator. With this tool, you may create RFC stub programs (that name SAP function modules) and instance packages (that show how to call stub programs).
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Question 37. What Is Rfc Stub Program?
Answer :
RFC stub packages contain all of the parameter-dealing with and communications vital to call SAP function modules from a non-SAP System.
Question 38. What Is Rfc-api?
Answer :
The RFC-API on OS/2, Windows, Windows NT and all R/3-based UNIX systems makes it possible to apply the RFC capability between an SAP System (R/three from Release 2.1 and R/2 from Release five.0D onwards) and a C program on the above structures. It is of no importance to the caller whether the faraway characteristic is supplied in an SAP System or in a C program.
Question 39. How Does Processing Of Rfc Interface Take Place In Abap/four?
Answer :
The RFC interface is correctly invisible to the ABAP/4 programmer. Processing for calling faraway packages is constructed into the CALL FUNCTION announcement. Processing for being referred to as is generated mechanically (within the form of an RFC stub) for each characteristic module registered as far flung. This stub serves as an interface among the calling application and the function module.
Question forty. Distiningish Between Rfc Client & Rfc Server?
Answer :
RFC patron is the instance that calls up the Remote Function Call to execute the function that is supplied with the aid of an RFC server. In the subsequent, the functions that may be accomplished remotely may be referred to as RFC functions and the features supplied via RFC API could be called RFC calls.
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Question 41. When Is Rfc Connection Closed ?
Answer :
When the context of the calling ABAP/four program has ended or explicitly by RfcAbort or RfcClose in the outside software.
Question forty two. What Is Transactional Rfc?
Answer :
To make the execution of RFC capabilities reliable, safe and unbiased from the provision of the RFC server or RFC server machine, the transactional RFC (tRFC) become delivered for R/three systems from Release three.0 onwards,facts may be tranferred between two R/3 structures. This ensures that the referred to as function module is done handiest once within the RFC server system.
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Question forty three. Where System Logs The Remote Call Request In Db Tables?
Answer :
The device logs the faraway name request inside the database tables ARFCSSTATE and ARFCSDATA with all of its parameter values. You can display the log report the usage of transaction SM58. When the calling application reaches a COMMIT WORK, the faraway name is forwarded to the asked system for execution.
Question forty four. What Are Restrictions For Transactional Calls?
Answer :
There are two restrictions on writing far off features which can be to be referred to as transactionally:
Transactional calls can not go back parameter values. As a end result, the interface for those features ought to now not specify any EXPORT parameters.
Functions that run transactionally won't perform name-backs: the caller's context does now not necessarily nevertheless exist whilst the decision-returned is relayed returned to the unique machine.
Question 45. What Exceptions Raise In A Remote Funcation?
Answer :
System increases COMMUNICATION_FAILURE and SYSTEM_FAILURE internally, there may be no purpose with a view to improve them to your application.
Question forty six. How Call-returned Mechanism Used In Rfc Calls?
Answer :
You can trigger this name-returned mechanism with the aid of the use of the special destination name "BACK". If this call is laid out in an RFC name on the device appearing as the server, the system makes use of the equal RFC connection that turned into installed whilst the server acquired the first call. Once an RFC connection is established, it's far maintained until it's miles either explicitly closed or until the calling application terminates.
