INTERVIEW QUESTIONS SAP R/3 SAP EDI DETAILS

Question: When should synchronous or asynchronous links be used?

Answer: Synchronous links have the advantage that the sub-process on the server can return values to the sub-process on the client that has started the link. Problems with synchronous links occur if the communication line or the server is temporarily not available. If this happens, the sub-process on the client can not be finished (otherwise there would be data inconsistencies).
(Example: There is a logistics system and a financial system. Every stock movement in logistics has to be posted in the general ledger of the financial system. If the link between logistics and finance is synchronous, no stock movement can be recorded in the logistics system if the communication line to the financial system is down.)
Because of this, synchronous links are usually used if the client only wants to get some data from the server and the sub-processes on the server do not have to write any data to the database.

Synchronous links have the advantage that the sub-process on the server can return values to the sub-process on the client that has started the link. Problems with synchronous links occur if the communication line or the server is temporarily not available. If this happens, the sub-process on the client can not be finished (otherwise there would be data inconsistencies).
(Example: There is a logistics system and a financial system. Every stock movement in logistics has to be posted in the general ledger of the financial system. If the link between logistics and finance is synchronous, no stock movement can be recorded in the logistics system if the communication line to the financial system is down.)
Because of this, synchronous links are usually used if the client only wants to get some data from the server and the sub-processes on the server do not have to write any data to the database. Source: CoolInterview.com

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