I have something in my mind for better performance, but i don't know if we can implement it with mysql.
For example I've a forum with hundreds of thousands of posts and I want to mark entries that is less than 1 year old as "hot". And when I send a SELECT query I want mysql to search first in "hot" indexes, if not found than search non-hot indexes.
So with that the posts more than 1 year old ones will be searched faster. they are already the most selected ones.
It's like archiving old posts with an another index.
But I don't want to change sql queries, just want to modify the table, database or indexes.
Unfortunately, this wouldn't be possible. However, just having a properly indexed DATE column would allow you to run two queries, first a search of the last year and then only running a search on older records if the first search failed to turn up enough records.