On 1/10/22 13:08, David G. Johnston wrote:
On Mon, Jan 10, 2022 at 12:09 PM Dominique Devienne <ddevienne@xxxxxxxxx
<mailto:ddevienne@xxxxxxxxx>> wrote:
Given |max_locks_per_transaction| * (max_connections
<https://www.postgresql.org/docs/current/runtime-config-connection.html#GUC-MAX-CONNECTIONS> +
max_prepared_transactions
<https://www.postgresql.org/docs/current/runtime-config-resource.html#GUC-MAX-PREPARED-TRANSACTIONS>)
from
https://www.postgresql.org/docs/current/runtime-config-locks.html
<https://www.postgresql.org/docs/current/runtime-config-locks.html>,
and max_conn being 100, that's not many locks.
Tom wrote "relation" for the number of locks necessary for DROP
OWNED BY.
What does it mean in this context? relation = table?
I'm confused here a bit as well. The items being talked about are
tables and indexes, both of which manifest as files on the filesystem.
But not all relations do (e.g., views). But if this isn't tied to the
filesystem then I would expect that other object types, especially
functions, would require locking as well, but those are decidedly not
relations.
Pretty sure this is related to:
https://www.postgresql.org/docs/current/explicit-locking.html
In other words to locks on data access.
How do I determine the current value, and change it?
https://www.postgresql.org/docs/current/runtime-config.html
<https://www.postgresql.org/docs/current/runtime-config.html>
(you already used the SHOW command to determine the current value)
David J.
--
Adrian Klaver
adrian.klaver@xxxxxxxxxxx
