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Explain the difference between optimistic locking and pessimistic locking.
Optimistic locking supposes no transaction conflict will occur and deals with the consequences if it does. Pessimistic locking supposes that conflict will occur and so stops it ahead of time with locks. In general, optimistic locking is preferred for the Internet and for many intranet applications.
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:
Create 1 experiment to demonstrate an aspect of query optimisation by using access-path structures (indexes), decomposition, or denormalisation. Once satisfied with your experiment
What it creates while a primary key is combined with a foreign key? It creates Parent-Child relation ship between the tables that connect them while a primary key is combined w
Which is a legal expression in SQL? SELECT NAME FROM EMPLOYEE is a legal expression in SQL.
explain the level architectures of the database management system
The Structured Query Language INTRODUCTION Database is an organised set of information about an entity having controlled redundancy and serves numerous applications. DBMS
Question : (a) Differentiate between database integrity and database security (b) Database security involves measures to avoid loss of privacy and loss of confidentiality. D
In the ER diagram, one example of subclassing is depicted following the Services entity. The subclasses Item Based and Time Based are created. The entity Services gains the attribu
What are the two types of indices? The two types of indices are:- A) Dense index B) Sparse index
Introduction In large projects, we can have many different companies working together. Generally, the project or contract is awarded to one company (Principal Contractor), which
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