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

Without some more details about expected usage of the data in your table worrying about indexes slowing you down smells a lot like premature optimization that should be avoided.

If you are really concerned about it, then setup a test database and simulate performance in the worst case scenarios. A test proving that is or is not a problem will probably be much more useful then trying to guess and worry about what may happen. If there is a problem you will be able to use your test setup to try different methods to fix the issue.