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Describe disk manager and their work?
Disk Manager: Responsible for fetching data regulated through file Manager from disk storage within Main memory and deciding what data to cache in memory. It is a part of the O.S. of host computer and all physical input and output operations are performed through it. It gives disk abstraction to file Manager s.t. file Manager need not be concerned along with the physical features of the underlying storage media.
explain the mapping constraints
The Concurrent Transactions Almost every commercial DBMS support multi-user environment. Therefore, allowing multiple transactions to proceed concurrently. The DBMS must make
Need For Distributed Database Systems A distributed database is a set of database kept on multiple computers that appears to applications as a one database. As a result, an app
Question: (a) List four disadvantages of the File Processing System as compared to the Database Systems. (b) The integrity of a database is enforced by integrity rules. One
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What is the use of Union and intersection operation? Union: The result of this operation contains all tuples that are either in r1 or in r2 or in both r1 and r2.Duplicate tuple
In this assignment, you will create a program that works with multiple tables. In this assignment, you will work with the factory and sales tables. 1. Create a new project nam
what are the type of the database
The dataset " CFOLYMPICS.XLS " contains the observations used in the above article. The definitions of the variables are also included in this spreadsheet. However, for the purpo
Control as Concurrent Tasks The expression control as simultaneous task means applying control for those events of object which can happen simultaneously. An object can be imp
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