Answer / paramjeet

To read data from a database tables we use logical database.
A logical database provides read-only access to a group of
related tables to an ABAP/4 program.

Advantages: i)check functions which check that user input is
complete, correct,and plausible. ii)Meaningful data
selection. iii)central authorization checks for database
accesses. iv)good read access performance while retaining
the hierarchical data view determined by the application logic.

dis advantages: i)If you donot specify a logical database in
the program attributes,the GET events never occur. ii)There
is no ENDGET command,so the code block associated with an
event ends with the next event statement (such as another
GET or an END-OF-SELECTION).

Answer / sunita garbyal

Logical database are special ABAP programs that retrive data & make it available to application programs.
Advantages of Logical database.
• No need of taking care of the key field and the foreign key realtionship between the tables in question.(relationship between diff tables are reflected in tree structure of Logical database).
• A selection screen with appropriate selection criteria is automatically created.
• Program standard authority checks are executed by Logical database itself in reports.
• Logical database improves the performance of reports at runtime.

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