What is the kernel of an SAP system? The kernel is a central program that acts as an interface between the SAP application and operating system. These files help startup the R/3 system, initialize the memory, create buffers and start managing the requests from users and effectively utilizing of hardware resources. The kernel is also responsible for starting and stopping all the application services like dispatcher, message server, collector, etc. Why Kernel Upgrade? SAP Kernel is the core of the application. Like all other applications, the Kernel contains the executable files (.EXE files for stating various processes in SAP). The Kernel is the heart of the operating system. It contains those files which are used to run every event in SAP. E.g.|: starting database, shutdowns of the database, starting sap, shutdown of sap, saposcol, to uncar the sap files etc. That's the reason why when a Kernel upgrade is done it means new versions of the various EXE files replace the older version
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