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How Creating an Index on Table helps Database engine to do fast Search  RSS feed

 
Ravi Kiran Va
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Hi

Kept on reading from many sires that Index will help Database engine to do search faster .

For example i have student table with many columns and i had created a index on one of the field



Could anyone please tell me how this helps DB Engine ??
 
Scott Selikoff
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Do you understand how databases search for information? Try reading Wikipedia for more information: http://en.wikipedia.org/wiki/Index_%28database%29
 
Scott Selikoff
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Ravi Kiran V wrote:Could anyone please tell me how this helps DB Engine ??


Actually your question can be rephrased to the non-computer variety... "How does the index in the back of an encyclopedia book help users search for information?". The answers are remarkable similar.
 
It is sorta covered in the JavaRanch Style Guide.
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