Why tune SQL?

Hello,

Here is a good article on "Why Tune SQL and the Best Practices that needs to be adapted for tuning an SQL" I liked the way the Author presented the information which is really cool and in a more understandable format and hope you all will like it.

http://etutorials.org/SQL/Sql+tuning/Chapter+1.+Introduction/1.1+Why+Tune+SQL/

Thanks a lot to the Author!

Cheers,
Suman