"Stephen Samuel (Sam)" <s...@sksamuel.com> writes: > This index covers both columns needed in the predicate/projection, and the > visibility bit is almost always set, why does it need to go to the heap at > all and doesn't just get what it needs from the index?
Peter's theory was that the particular tuples you were fetching were
in not-all-visible pages. That seems plausible to me.
regards, tom lane
