Re: pg_upgrade and schema complexity...

On 6/2/23 17:44, Ron wrote:
> Ran into this when upgrading from 13.11 to 15.3...
> 
> The pg_restore phase failed with "ERROR: out of shared memory", and 
> recommended that I increase max_locks_per_transaction.  Doing so let the 
> process run to completion.
> 
> It took 12.5 minutes to upgrade a 13GB instance.  Soon after, I upgraded 
> a 78GB cluster, and it only took 3.1 minutes.

Where/how did you measure  those sizes?

> 
> (Both are VMs (same number of CPUs and RAM) connected to the same SAN.)
> 
> A "pg_dump --schema-only" of the two systems shows that the 
> small-but-slow schema is 5.9M lines.

Anything special you are doing in this cluster to create all those lines?

What is the line count for the other instance?

> 
> Is this to be expected of such a huge schema?
> 

-- 
Adrian Klaver
adrian.klaver@aklaver.com