What are logical databases? What are the advantages/disadvantages of logical databases?
Ans :- A Logical Database is a hierarchical structure of tables. Use the GET statement to process Logical Databases.
LDB consists of logically related tables grouped together - used for reading and processing data.
Advantages
1. No need of programming for retrieval , meaning for data selection
2. Easy to use standard user interface, have check completeness of user input.
Disadvantages
1. Fast in case of lesser no. of tables But if the table is in the lowest level of hierarchy, all upper level tables should be read so performance is slower.
Preparation of the data records by the L.D.B and reading of the data records in the actual report are accomplished with the command pair.
Put and Get.
The three main elements of LDB are
Structure, Selections, Database Program.
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