SQLite: COUNT slow on big tables

Question

I\'m having a performance problem in SQLite with a SELECT COUNT(*) on a large tables.

As I didn\'t yet receive a usable answer and I did some further testing, I edited m

Answer 1

On the matter of the column constraint, SQLite maps columns that are declared to be INTEGER PRIMARY KEY to the internal row id (which in turn admits a number of internal optimizations). Theoretically, it could do the same for a separately-declared primary key constraint, but it appears not to do so in practice, at least with the version of SQLite in use. (System.Data.SQLite 1.0.74.0 corresponds to core SQLite 3.7.7.1. You might want to try re-checking your figures with 1.0.79.0; you shouldn't need to change your database to do that, just the library.)