Re: Querying an index's btree version
Thank you for the info, Peter.
Separate but related follow-up question: when you restore a DB from a backup, does the restored index use the old format or the latest one?
Thank you,
Darren Lafreniere
On Wed, Mar 11, 2020 at 4:30 PM Peter Geoghegan <pg@bowt.ie> wrote:
On Wed, Mar 11, 2020 at 1:26 PM Darren Lafreniere
<dlafreniere@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
Darren Lafreniere |
Senior Software Engineer | oneZero Financial Systems |
| site: www.onezero.com |
email: dlafreniere@onezero.com |
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