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SAP BASIS (TRNASACTIONS (ABAP / Tables / Data Dictionary (SE11 −…

- - - - The data in each client may be separate from that of the other clients. There are basically two types of data in an SAP R/3 system − Client-dependent and Client-independent data.
        Client-dependent data is defined as data specific to an individual client. Examples of client-dependent data include number ranges, ABAP variants, and user masters as well as the data that is created or updated through SAP R/3 transactions.
        Client-independent data can be defined as data contained across all clients in the system. Examples of client-independent data include data dictionary objects (tables, views), ABAP source code, screens, and menus.
      - Data resides in tables. To determine if a particular table is client-dependent or client-independent, the table structure needs to be reviewed.
        The table structure can be viewed by the data dictionary (SE11). If MANDT (client in German) is the first key field of the table, then the table is client-dependent; otherwise, the table is client-independent.
        For example, the TSTC table is client-independent; however, the USR01 table is client-dependent.
      - Every SAP R/3 system contains the three clients 000, 001, and 066. Let’s review these clients and examine what they contain.
        These clients provide different features and must not be deleted.
        Client 000 performs special functions. In particular, it is given extended functionality during upgrades.
        Client 001 is basically a copy of 000 and can be used as a basis for a new customizing client.
        Client 066 is a special client which is provided for operational system monitoring. It is used by SAP R/3’s Early Watch Service to provide performance recommendations.