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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.
using the invoice table shown below,write the relational schema,draw a dependencies,inclunding all partial and transitive dependencies.assume that the table does not contain repeat
explain exhausitively the problems associated with er diagrams with ellustrations
Define an operator that a Relational Algebra does not have Ans: Relational Algebra does not have Aggregation operators.
What should be declared explicitly in the corresponding ABAP/4 Statements to access internal tables without header lines & why? Work Area. This is needed as the Work Area is
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
Implementation of association as an object Implement as a separate association object, independent of either class, as in Figure. An association object is a group of pairs
please i request for your assistance in developing a case-based online phone repair
Determine the OBJECTIVES of object design After passing through this unit, you should be able to: describe and apply concept of generalisation; understand and appl
What is a shadow copy scheme? It is simple, but efficient, scheme known as the shadow copy schemes. It is based on making copies of the database called shadow copies that singl
Domain Constraints Domain constraints are primarily formed for defining the logically correct values for an attribute of a relation. The relation allows attributes of a relatio
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