Thanks Tomas. I ran a vacuum full on the 9.6 table -- still no difference in the query plan. The shared buffers hit went up slightly to 36069.
Shira
On Mon, Jan 13, 2020 at 1:12 PM Tomas Vondra <tomas.vondra@xxxxxxxxxxxxxxx> wrote:
On Mon, Jan 13, 2020 at 12:44:14PM -0800, Shira Bezalel wrote:
>Hi Michael,
>
>I appreciate your question. I ran a vacuum analyze on the 9.6 table and it
>yielded no difference. Same number of buffers were read, same query plan.
>
VACUUM ANALYZE won't shrink the table - the number of buffers will be
exactly the same. You need to do VACUUM FULL, but be careful as that
acquires exclusive lock on the table.
regards
--
Tomas Vondra http://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
Shira Bezalel
Database Administrator & Desktop Support Manager
San Francisco Estuary Institute
Ph: 510-746-7304
