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What are called multilevel indices?
Indices with two or more levels are known as multilevel indices.
Explain the conventions for displaying an ER schema as an ER diagram? An E-R Diagram scheme might describe certain constraints to that the contents of a database must conform.
A set of possible data values is called? A set of possible data values is called as domain.
What is the most significant feature that does not directly map into programming language structures? Why? Association, since there are complex types of association, like as qu
Discuss the count function? The COUNT function used returns the number of tuples or values fixed in a query. The count function comprises two types of syntax: (1) COUNT (*)
What is assertion? Mention the forms available. An assertion is a predicate expressing a condition that we wish the database always to satisfy. Domain integrity constraints.
Discuss deferred update technique of recovery. What are the advantages? Ans: The deferred update methods do not physically update the database on disk till after a transact
List the drawbacks of relational database system A) Repetition of data B) Inability to s certain information.
Which language has presently become the defacto standard for interfacing application programs along with relational database system? The language which has recently become the
Depending upon the rules we have found, we can classify the locks into two types. Shared Lock: A transaction might be acquiring shared lock on a data item in order to read it
limitations and benefits in database tecknowlagy
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