What is the cost of indexing multiple db columns?

Question

I\'m writing an app with a MySQL table that indexes 3 columns. I\'m concerned that after the table reaches a significant amount of records, the time to save a new record wi

Answer 1

Only for illustration, but I'm expecting to insert between 25 and 200 records a day.

With that kind of insertion rate, the cost of indexing an extra column will be negligible.