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Compare the Nested-loop join and block-nested loop join Ans: Nested loop join - It is costly as worst case cost, no. of block accesses needed is n r * b s + b r where b
Differance between Open addressing and chaining for collision resolution ? In open addressing , proceeding from the occupied position specified by hash address the program che
What are the two types of errors? The two types of errors are: a) Logical error b) System error
Safe Banking is a Canberra based credit union, which has several branches around Canberra and Queanbeyan. YOU have taken over Safe Banking. YOU need to create a database that organ
How does a query tree represent a relational algebra expression? Discuss any three rules for query optimisation, giving example as to when should each rule be applied. Ans
Consider the relations City (city_name, state) Hotel (name, address) City_hotel (hotel_name, city_name, owner) Answer the following queries in relational algebra (i) Find
WHAT IS DATABASE TECHNOLOGIES
What is a candidate key? Minimal super keys are known as candidate keys.
List the types of authorization. A) Read authorization B) Write authorization C) Update authorization D) Drop authorization
Explain the cartesian product in Database Management System
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