Recently I've learned the wonder of indexes, and performance has improved dramatically. However, with all I've learned, I can't seem to find the answer to this question.
Indexes are great, but why couldn't someone just index all fields to make the table incredibly fast? I'm sure there's a good reason to not do this, but how about three fields in a thirty-field table? 10 in a 30 field? Where should one draw the line, and why?
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