Thanks! Unfortunately I can't find the shell script it created in /var/log/postgresql -- however, I ran vacuumdb --full --verbose --analyze-in-stages and the DB performs much, much better.
As I can't seem to find the script, anything else a good thing to do after doing pg_upgrade to prime the DB?
On Tue, Oct 29, 2019 at 10:38 PM Laurenz Albe <laurenz.albe@xxxxxxxxxxx> wrote:
On Tue, 2019-10-29 at 22:11 -0700, Wells Oliver wrote:
> I just upgraded from 9.6 to 12, and am noticing some queries are slow.
>
> I did this kind of query:
>
> SELECT relname, last_vacuum, last_autovacuum, last_analyze, last_autoanalyze
> FROM pg_stat_all_tables
> WHERE schemaname = 'myschema';
>
> And noticed null values for everything, including last analyze date.
>
> Does this mean the planner won't be able to optimize for these tables?
> Do I need to do something to prep my DB for planning after upgrade?
You used pg_upgrade, right?
pg_upgrade won't migrate any table statistics.
You'll have to run ANALYZE to collect new ones.
This is even mentioned in the output of pg_upgrade,
and it writes a convenient shell script that does the
ANALYZE for you.
Yours,
Laurenz Albe
--
Cybertec | https://www.cybertec-postgresql.com
--
Wells Oliver
wells.oliver@xxxxxxxxx
wells.oliver@xxxxxxxxx
