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این کمکت می کنه:
http://www.databasejournal.com/featu...0897_1382791_1
توضیحات بیشتر در مورد ایندکس:
http://www.sitepoint.com/article/opt...ql-application
What are Indexes?
Indexes are organized versions of specific columns in your tables. MySQL uses indexes to facilitate quick retrieval of records. With indexes, MySQL can jump directly to the records you want. Without any indexes, MySQL has to read the entire data file to find the correct record(s).
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