HCL Solved placement Papers - DBMS Concept - part 2
How Placement Success Book
(Hard Copy) Can Help Your Preparation?
Dear Reader, you can now prepare simultaneously for placement tests of several companies like TCS, Wipro, HCL, Infosys, CTS, Syntel, Mahindra Satyam, L&T Infotech, IBM, 3i Infotech, Accenture & other leading Indian companies...
Click To Know How Placement Success Book (Hard Copy)Can Help You...
1) Atomicity is _____
a)Either all actions are carried out or none are. Users should not have to worry about the effect of incomplete transactions. DBMS ensures this by undoing the actions of incomplete transactions.
b)A concept which is used to model a relationship between a collection of entities and relationships. It is used when we need to express a relationship among relationships.
Asnwer is:
Either all actions are carried out or none are. Users should not have to worry about the effect of incomplete transactions. DBMS ensures this by undoing the actions of incomplete transactions.
2) The phase that identifies an efficient execution plan for evaluating a query that has the
least estimated cost is referred to as___.
a) Query optimization
b) Query String
Answer is: Query optimization
3) Expansion of DDL is _____.
a) Data Description Language
b) Data Definition Language
c) Data Degree Language
Answer is: Data Definition Language
4) A collection of conceptual tools for describing data, data relationships data semantics and
constraints is called as_____.
a) Data base
b) Table
c) Data model
Answer is: Data model
Click Here To Know What Placement Success Book (Hard Copy) Contains & Know How To Order This Book
