logical databases

What are logical databases? n   What are the advantages/ dis-advantages of logical databases? – 

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.


 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.


 i)If you do not 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).