Disadvantages of logical database are following:
=> Slow retrieval of data, as all the tables at upper level will have to be read, if the user wants to read the table at the lowest level of hierarchy.
=> Every time there is a need to specify logical database in the program so that GET event occur.
=> Slow retrieval of data, as all the tables at upper level will have to be read, if the user wants to read the table at the lowest level of hierarchy.
=> Every time there is a need to specify logical database in the program so that GET event occur.
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