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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.
write a database program for concurrency transaction in a bank
Explain the components of Database System in details.
, write the relational schema, and draw the new dependency diagrams. Identify the normal forms for each table structure you created
Explain the structure of well formed formulae in relational calculus. Ans: a. An atom is a formula b. If P1 is a formula, after that so are ¬P1 and (P1) c. If P1 and P2 a
Describe different steps of the object-oriented design process. The broad steps of the object-oriented design process are: a. Define context and modes of use of the system
The Database MySQL scripts cars_for_sale.sql and car_details.sql containing the data to use for this task have been supplied. To complete this task, you need to first create
Describe substring comparison in SQL. For the relation Person (name, address), write a SQL query that retrieves the names of people whose name starts along with ‘A' and address co
What is a cascading update? Referential integrity constraints needs that foreign key values in one table correspond to primary key values in another. If the value of the primar
Aggregate functions Some of these functions are min, count, max, and avg. These functions help in getting consolidated information from a set of tuples. Example:
Difference between LEFT OUTER JOIN and RIGHT OUTER JOIN In left outer join tuples from the left-hand-side relation which do not match any tuple in the right-hand-side relation
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