The database layer manages all data in the R/3 System. It contains the database management system (DBMS) and the actual data.
Presentation layer: The presentation layer is the top layer of the R/3 SAP Basis system and includes communication with the user. Here, the data is graphically prepared for the user on the terminal device by means of software components from the application programs of the application layer. The presentation layer represents the interface to the user (SAP GUI).
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Site Reliability Engineering(SRE) is the equivalent of SAP Basis in the Google world. Ben Treynor, who has been with Google since 2003 and is considered the godfather of SRE, describes SRE as "what happens when you give operations tasks to a software engineer".
Some missing SAP basic functions in the standard are supplied by the PC application "Shortcut for SAP Systems".
Make sure there is enough space (the size of the OCS files multiplied by 2) in the transport directory (see the R/3 profile parameter DIR_TRANS with the AL11 transaction or the SE38 transaction and the report RSPARAM).
This article focuses on the use of ACL files such as secinfo and reginfo files.