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The underlying database of the SAP R/3 system acts as the main container for all the information managed by the system. The database includes almost everything the users can see on their screens: program source code, 53
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Presentation Interface screens, texts, menu options, customer information, printer definitions, statistical information, transactional data, and so forth. The database interface supports different relational databases from different vendors. The main task of the database interface is to convert the SQL requests (ABAP open SQL) from the SAP development environment to the database's own SQL requests. During the interpretation of the ABAP open SQL statements, the database interface makes a syntax check to verify that the statement is correct, and it also automatically tries to make an optimal use (reuse) of the SAP buffers in case a similar SQL statement was requested previously. These buffers are held locally in the main memory of each application server. Besides using the portable SQL dialect from SAP (ABAP open SQL, previously known as SAP SQL), it is also possible to directly access the database using ABAP native SQL (previously known as EXEC SQL) statements. With ABAP native SQL calls, a developer can make specific database SQL calls, which are not supported using the standard ABAP open SQL statements. However, this method is not recommended since the code might not be completely portable or could cause problems during upgrading of the database engine or the R/3 applications. The database interface also has a cursor caching method. Database cursors are like portions of memory that are allocated by the system to process SQL statements. A cursor caching method means that the system tries to reuse, if possible, the access paths which were previously used to process SQL statements. However, this method is not recommended since the code might not be completely portable or could cause problems during upgrading of the database engine or the R/3 applications. The database is the heart of the SAP R/3 system. It not only is the central source of information for companies' business data, but also the container of user information, software components, documentation, and administrative statistical data to be used when managing or monitoring the system. One of the most important logical parts of the database is the ABAP object repository, which contains the following: The ABAP dictionary (formerly known as data dictionary). This is the central source for the definition of objects, such as type and length of fields, indexes, table relationships, and so on. In database terms, these types of definitions are known as metadata. The dictionary is intimately connected to all parts of the business applications and is a core part of the ABAP development workbench. 8, "ABAP Data Dictionary," deals extensively with the logical management of the R/3 metadata. The ABAP source and executable programs. Since ABAP is an interpreted language, it can be dynamically regenerated by the application servers (remember the ABAP processor inside the work processes). The database, of course, includes the data itself. SAP distinguishes three different types of data: master, control, and transaction data. Master data contains information that does not change often, such as a user's name, printer's definition, or address of a supplier. This type of data is usually used the same way for similar objects. Control data is held in control tables and includes system and technical functions of the SAP system. Transaction data is the most volatile and frequently used information in day to day business operations, such as customer orders or accounting transactions including payments, debits, credits, and so on. The SAP declared dictionary tables have the corresponding structure in the physical underlying database. The R/3 system handles different types of tables. SAP transparent tables are structures that exactly match an 54
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SAP R/3 Communication Protocols and Interfaces underlying database table. With certain database knowledge, users can view or manage these tables directly from the database's own utilities but this is not advised since it may introduce inconsistencies. Other table types managed by SAP, which may eventually disappear are cluster tables, made of several SAP tables related using foreign keys, and pooled tables, corresponding to a set of tables stored in a single table. For more detailed information on these types of SAP tables, refer to the corresponding sections in Chap. 8. The database interface sends the data read from the ABAP dictionary tables to the ABAP programs by placing it in special work areas (memory buffers known to the work processes). Conversely, the database interface gets the modified data from those areas and sends it to the database. Software developers can easily declare and work with such areas, since the dictionary is integrated with ABAP. Within an ABAP program, the developer can create additional tables that only exist as long as a program is running. These internal tables can be dynamically enlarged so that it is not necessary for developers to know in advance the amount of memory the internal tables will occupy.
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