What are the disadvantages of having many indices?

Question

I recently sped up a complicated query by an order of magnitude by giving SQLite a good index to work with. Results like this make me wonder if I should index a lot of other

Answer 1

The cost of an index in disk space is generally trivial. The cost of additional writes to update the index when the table changes is often moderate. The cost in additional locking can be severe.

It depends on the read vs write ratio on the table, and on how often the index is actually used to speed up a query.