On Wed, Mar 11, 2020 at 1:26 PM Darren Lafreniere
<dlafreni...@onezero.com> wrote:
> We've read that PG 12 has improved btree index support, and that the latest
> internal btree version was bumped from 3 to 4. Is it possible to query the
> btree version that a particular index is using? We'd like to automatically
> start a concurrent re-index if we detect any btree indexes are still on
> version 3.
It's possible, but you have to install the superuser-only pageinspect
extension. Here is how you'd determine that an index called
'pg_aggregate_fnoid_index' is on version 4:
regression=# create extension pageinspect;
CREATE EXTENSION
regression=# select version from bt_metap('pg_aggregate_fnoid_index');
version
---------
4
(1 row)
--
Peter Geoghegan
