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What is a hash index? A hash index organizes the search keys, with their associated pointers, into a hash file structure.
The following variant of the primary copy asynchronous-update replication protocol has been proposed for totally replicated systems. (a) A transaction executing at site A updat
Which is a legal expression in SQL? SELECT NAME FROM EMPLOYEE is a legal expression in SQL.
Code an Oracle Database trigger to enforce the constraint that an employee can never change his or her department.
Explain four causes for failures in data warehouse projects
What is object containment? References among objects can be used to model dissimilar real-world concepts.
Describe the Composite Key Composite Key: Sometimes one key is not enough to uniquely recognize a row. E.g. in a single class Roll is enough to search a student, but in the w
Draw and explain the three level architecture of the database system? A DBMS gives three levels of data is said to follow three-level architecture. The trget of the three-schem
Consider a database schema consisting of four relations, whose schemas are: Product (maker, model, type) PC (model, speed, ram, hd, price) Laptop (model, speed, ram, hd, s
A Structure of a dependency diagram
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