Re: [HACKERS] [PATCH] Add GUCs for predicate lock promotion thresholds

ilmari@ilmari.org (Dagfinn Ilmari Mannsåker) writes:

> One thing I don't like about this patch is that if a user has increased
> max_pred_locks_per_transaction, they need to set
> max_pred_locks_per_relation to half of that to retain the current
> behaviour, or they'll suddenly find themselves with a lot more relation
> locks.  If it's possible to make a GUCs default value dependent on the
> value of another, that could be a solution.  Otherwise, the page lock
> threshold GUC could be changed to be expressed as a fraction of
> max_pred_locks_per_transaction, to keep the current behaviour.

Another option would be to have a special sentinel (e.g. -1) which is
the default, and keeps the current behaviour.

-- 
"A disappointingly low fraction of the human race is,at any given time, on fire." - Stig Sandbeck Mathisen