Field optimization
(A): can small, not big
(B): use fixed-length, not variable length
Index Tuning
(A) : a table's primary key and foreign key, must have an index
(2): The amount of data that should have more than 300 indexes table
(C): should be indexed on the field often connected with other tables
(D): fields in the Where statement often, especially in the field of large tables, indexing
(E): The index should be selected based on the high performance field
(Vi): The index should be built on a small field, even for large text fields long field, not to index