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Explain the functions of data manager?
Functions of Data Manager :- Convert operations in user's queries coming directly through query processor or indirectly in an application program from users logical view to a physical file system.- It interfaces along with file system enforces constraints to maintain consistency. And integrity of the data as well as its security. (Authorization and Integrity Manager).- Synchronizing simultaneous operations performed through concurrent users. (Transaction Manager) - Back up and recovery operations (Transaction Manager)
Define check point and its impact on data base recovery. Ans: There could be hundreds of transactions handled per minute, in a large on-line database system.
How do I begin
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Fourth Normal Form (4NF) When attributes in a relation have multi-valued dependency, further Normalization to 4NF and 5NF are needed. Let us first find out what multi-valued d
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