I have some questions regarding InnoDB indices. Say I have a table with millions of records. On of the fields is a type field that has a possible value of 1,2,3, or 4. I sometimes query by the type field and may at other times order on it. Do queries benefit from an index with this low of a selectivity? If through the query browser I find that they do, should I increase the selectivity of the index by making it a compound index and adding my Primary Key to the TYPE index? If I make it a compound index, does it have any positive impact on INSERT, UPDATE, or maybe just DELETE? R.
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