"scott.marlowe" <scott.marlowe@ihs.com> writes:
> There are tons of hints that it works this way in how they're written, but
> nothing that just comes out and says that with pgsql's mvcc
> implementation, an index scan still has to hit the pages that contain the
> tuples, so often in pgsql a seq scan is a win where in other databases and
> index scan would have been a win?
> If not, where would I add it if I were going to write something up for the
> docs? Just wondering...
AFAIR the only place in the docs that mentions seqscan or indexscan at
all is the discussion of EXPLAIN in "Performance Tips". Perhaps a
suitably-enlarged version of that section could cover this.
regards, tom lane