Table of Contents
CS404 FINAL TERM SOLVED PAPERS
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Logical data independence provides independence in a way that changes in the conceptual model do not affect external views. Or it can simply be stated on the Immunity of the outer level from changes at the conceptual level. We do have data independence at various levels, but you should be careful before changing anything in the database because not all changes are accepted transparently on different levels.
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There may be some changes that can cause damage or inconsistencies in database levels. Changes that may be done transparently may include the following: o Adding a file to the database o Adding a new field to the file o Changing the type of a specific field But a change that may look similar to the changes listed above could cause problems in the database; for example Lubrication attribute from the database structure.
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This can be serious because any application that uses the attribute may no longer be executable. So have data the independence we have at our disposal, after some time we still have a problem change, that is, before making a certain change, its impact should also be kept in mind and changes should be made to stay within the bounds of data independence.
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To ensure the safe and proper functioning of the DBA database system 24/7 it also monitors some related activities and ensures that all users use the Database Management System authorities legally and that the various