Interested to Buy Any Domain ? << Click Here >> for more details...
What is normalization and its forms?
- 4 Answers
- 14319 Views
- Challenger Financial, I also Faced
- E-Mail Answers
Answer Posted / rohit
Database normalization, sometimes referred to as canonical
synthesis, is a technique for designing relational database
tables to minimize duplication of information and, in so
doing, to safeguard the database against certain types of
logical or structural problems, namely data anomalies. For
example, when multiple instances of a given piece of
information occur in a table, the possibility exists that
these instances will not be kept consistent when the data
within the table is updated, leading to a loss of data
integrity. A table that is sufficiently normalized is less
vulnerable to problems of this kind, because its structure
reflects the basic assumptions for when multiple instances
of the same information should be represented by a single
instance only.
Higher degrees of normalization typically involve more
tables and create the need for a larger number of joins,
which can reduce performance. Accordingly, more highly
normalized tables are typically used in database
applications involving many isolated transactions (e.g. an
automated teller machine), while less normalized tables tend
to be used in database applications that need to map complex
relationships between data entities and data attributes
(e.g. a reporting application, or a full-text search
application).
Database theory describes a table's degree of normalization
in terms of normal forms of successively higher degrees of
strictness. A table in third normal form (3NF), for example,
is consequently in second normal form (2NF) as well; but the
reverse is not necessarily the case.
Although the normal forms are often defined informally in
terms of the characteristics of tables, rigorous definitions
of the normal forms are concerned with the characteristics
of mathematical constructs known as relations. Whenever
information is represented relationally, it is meaningful to
consider the extent to which the representation is normalized.
| Is This Answer Correct ? | 9 Yes | 4 No |
Post New Answer View All Answers
Can we call future method from trigger?
What is field in algebra?
What are sql server functions?
What is meant by referential integrity?
Do you know what is similarity and difference between truncate and delete in sql?
How do I find the sql server instance name?
Can two tables share a primary key?
What is buffer cash in sql server?
How to use subqueries in the from clause in ms sql server?
Explain what is lock escalation and what is its purpose?
Can we take the full database backup in log shipping?
Explain the microsoft sql server delete command?
Explain comment on transactions?
What do you understand by a stored procedure?
Explain how to use linked server?
