Re: Hi All,

Ryan MYJ <ryanmyj(at)gmail(dot)com> writes:
> Currently I'm working on upgrading a postgresql version from 9.3 to 12. The
> database size is around 700G.
> I finished the pg_upgrade process but when I ran 'analyze_new_cluster.sh'
> it stucked at the first log 'vacuumdb: processing database "otdb":
> Generating minimal optimizer statistics (1 target)'.

> Then I checked the active query, the following query has been running for
> several hours:
> pid | db | start | lap |
> query
> ---------+-----------+-------------------------------+-----------------+------------------------------
> 1822933 | otdb | 2023-02-18 03:02:36.035755+08 | 04:56:41.408329 |
> ANALYZE pg_catalog.pg_class;

You omitted the pg_stat_activity columns that could give some insight
into why this is waiting. The first thing I'd think of though is that
it's blocked waiting for a lock, in which case looking into pg_locks
to see what is blocking it could help.

regards, tom lane