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what is De-normalization in sql?

Posted By :Dhivakaran     Posted Date :November 30, 2010    Points :10   Category :Sql Server 
De-normalization is a technique to move from higher to lower normal forms of database modeling in order to speed up database access.

You can also find related Interview Question to what is De-normalization in sql?  below: 

What is normalization?

Well a relational database is basically composed of tables that contain related data. So the Process of organizing this data into tables is actually referred to as normalization. (More...)

What is Normalization?

Database normalization is a data design and organization process applied to data structures based on rules that help building relational databases. In relational database design, the process of organizing data to minimize redundancy is called normalization. Normalization usually involves dividing a database into two or more tables and defining relationships between the tables. The objective is to isolate data so that additions, deletions, and modifications of a field can be made in just one table and then propagated through the rest of the database via the defined relationships.

Shashi Ray (More...)

What is De-normalization?

De-normalization is the process of attempting to optimize the performance of a database by adding redundant data. It is sometimes necessary because current DBMSs implement the relational model poorly. A true relational DBMS would allow for a fully normalized database at the logical level, while providing physical storage of data that is tuned for high performance. De-normalization is a technique to move from higher to lower normal forms of database modeling in order to speed up database access. (More...)

What is Normalization?

Normalization is a process of organizing data to minimizing redundancy. Normalization process involves dividing tables in to 2 or more tables and defining relationship between them. The aim is to segregate the data so that CRUD operation can be made on one table and propagated to rest table via relationship. (More...)

Database: what are different normalization forms?

.1NF-Eliminate Repeating Groups
.2NF-Eliminate Redundant data
.3NF-Eliminate Columns not dependent on key
.BCNF:Boyce-Codd Normal form
.4Nf-isolate independent multiple relationships
.5Nf-isolate smantically related multiple relationships
.ONF-Optimal Normal Form
.DKNF:Domain-key Normal Form (More...)

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