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What are the responsibility of File manager?
File Manager : Manager allocation of space on disk storage and the data structures used to represent within stored on disk. It is also responsible for - - Locating block of target record - Requesting block from disk Manager - Transmitting required record to data Manager This file Manager can be implemented using an interface to the existing file subsystem provided through the O.S. of the host computer or it can involved a file subsystem written especially for DBMS.
What is Nested Trigger? A trigger can also having INSERT, UPDATE and DELETE logic within itself, so when the trigger is fired because of data modification it can also cause ano
Analyzing Association Traversal Till now, we have supposed that associations are bi-directional. But in the case of traversal, it is in only one direction in any application,
Explanation on Data Sharing?
What are the disadvantages of relational data ? Disadvantages • Performance - If the number of tables among that relationships to be established are large and the tables t
what is union compatable?
What is the use of integrity constraints? Integrity constraints make sure that changes made to the database by authorized users do not result in a loss of data consistency. The
Define the Canonical cover Ans: A canonical cover F c for F is a set of dependencies like F logically implies all dependencies in F c , and F c logically entails all dependen
Explain the concept of a data model ? Data Model - Model is an abstraction procedure which hides irrelevant details although highlighting details relevant to the application
An entity type usually has an attribute whose values are distinct for every individual entity in the collection. Such an attribute is known as a key attribute and its values can be
The data of a view is not physically stored, but derived from one or more tables. True the data of a view is not physically stored
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