What is RFC?RFC is a mechanism that allows business applications to communicate and exchange information (in pre-defined formats) with other systems. RFC stands for 'Remote Function Call'RFC consists of two interfaces:.

• Sap Rfc

Sap Rfc

A calling interface for ABAP Programs. A calling interface for Non-SAP programs.Any ABAP program can call a remote function using the CALL FUNCTION.DESTINATION statement. SynchronousRequires both the systems (client and server) to be available at the time of communication or data transfer. It is the most common type and is required when the result is required immediately after the execution of sRFC.sRFC is a means of communication between systems where acknowledgments are required. The resources of the Source System wait on the target system and ensure that they deliver the message/data with ACKD.

The Data is consistent and reliable for communication.The issue is if the target system is not available, the source system resources wait until target system is available. This may lead to the Processes of source system to go into Sleep/RFC/CPIC Mode at target systems and hence blocks these resources.Used for.

For communication between systems. For communication between SAP Web Application Server to SAP GUIAsynchronous. It is communication between systems where acknowledgments are not required (it is similar to postcard delivery).It doesn't require both the systems to be available at the time of execution and the result is not immediately required to be sent back to the calling system.The Source System resource does not wait for the target system as they deliver the message/data without waiting for any acknowledgment. It is not reliable for communication since data may be lost if the target system is not available. Used for -.

For communication between systems. For parallel processingTransactional. It is a special form of aRFC.

Transactional RFC ensures transaction-like handling of processing steps that were originally autonomous.Transactional RFC is an asynchronous communication method that executes the called function module in the RFC server only once, even if the data is sent multiple times due to some network issue. The remote system need not be available at the time when the RFC client program is executing a tRFC. The tRFC component stores the called RFC function, together with the corresponding data, in the SAP database under a unique transaction ID (TID).

TRFC is similar to aRFC as it does not wait at the target system (Similar to a registered post). If the system is not available, it will write the Data into aRFC Tables with a transaction ID (SM58) which is picked by the scheduler RSARFCSE (which runs for every 60 seconds). Used For-. Extension of Asynchronous RFC. For secure communication between systemsQueued. Implementation of qRFC is recommended if you want to guarantee that several transactions are processed in a predefined order.Types of RFC ConnectionsType 3 - entries specify the connection between ABAP systems. Here, we must specify the host name / IP address.

You can, however, specify logon information if desired. This is applicable for both type of RFCs, between ABAP systems and external calls to ABAP systemsType I - entries specify ABAP systems connected to the same database as the current system. These entries are pre-defined and cannot be modified.

Example entry name: ws0015K1824. ws0015=host name. K18=system name (database name). 24=TCP-service nameType T - destinations are connections to external programs that use the RFC API to receive RFCs. The activation type can be either Start or Registration.

If it is Start, you must specify the host name and the pathname of the program to be started. How to Code an RFC?1.In the function module attributes tab (transaction code SE37), set the processing type as Remote-enabled module to create a remote function module. 2.Write the code for the function module.3.Define the destination of the RFC server in the RFC client system that calls the remote function ( via SM59 transaction).4.Declaring Parameters: All parameter fields for a remote function module must be defined as reference fields, that is, like ABAP Dictionary fields.5.Exceptions: The system raises COMMUNICATIONFAILURE and SYSTEMFAILURE internally. You can raise exceptions in a remote function just as you would in a locally called function.Debugging Remote Function Calls. It is not possible to debug a remote function call to another system. However, when testing ABAP-to-ABAP RFC calls, you can use the ABAP debugger to monitor the execution of the RFC function in the remote system.

With remote calls, the ABAP debugger (including the debugging interface) runs on the local system. Data values and other run information for the remote function are passed in from the remote system.

TCODEDescriptionFunctional ArearfcURRrfc Destinations (Display/Maintain)Asynchronous rfc Error LogABAP Function ModulesIntegration Engine - MonitoringGateway Monitorq rfc Monitor (Outbound Queue)q rfc Monitor (Inbound Queue)Maintain rfc Server Group AssignmentVariant for RSA rfcEXAssign rfc dest. To Logical SystemsWorkflow rfc MonitorMaintain rfc Dest. For Alert Serverbg rfc Configurationq rfc Monitor (Saved E-Queue)Server Resources for Asynchr. RfcCall RSA rfcEXrfc TraceABAP Editorbg rfc Monitorq rfc Administrationrfc destinations with logon dataABAP Dump AnalysisMaintain Table SSM rfcMaintain Workflow rfc DestinationUser MaintenanceCreate MOLAP rfc TestsConfigure rfc DestinationEHS: rfc - PB20 Applicant MasterXSLT testerUser rfc Monitort rfc/q rfc: Confirm. Status & dataAnalyze rfc Data from E-Sourcingrfc Destination MaintenanceIntegration Directory CacheCreate rfc Connectionsrfc - CBHR11 Create External PersonIntegration Engine - AdministrationEnqueue test for dialog rfcDisplay q rfc Monitorrfc - EHSBP51 Create Extern.

Companyrfc - EHSBP11 Create Physicianrfc - EHSBP31 Create Health CenterEHS: rfc - PA20 HR Master Datarfc - CBHR21 Create AuthorityList of SAP SystemsABAP Dictionary MaintenanceObject NavigatorWork Process OverviewWorkload and Performance StatisticsOnline System Log Analysis.