MySQL performance tip No. 3: Rows can be served from indexes. InnoDB can find and actually serve rows directly from indexes, whereas a secondary key points to the primary key and the primary key ...

Indexes in MySQL are used to speed up access in the database and help enforce database constraints (such as UNIQUE and FOREIGN KEY). ... MySQL optimization key #4: Keep the database in memory.

Sun Microsystems, which acquired Open Source database firm MySQL in January, has apparently found the key to unlocking their plans to make some MySQL features commercial-only: torch-wielding users..