Re: [HACKERS] Relpartbound, toasting and pg_class

Tom Lane wrote:
> Andres Freund <andres@anarazel.de> writes:
> > On 2017-06-12 17:10:28 -0400, Peter Eisentraut wrote:
> >> Cases where relacl became too large have been known to exist.  I'm not
> >> sure whether relpartbound can really be that large to change the
> >> scenario significantly.
> 
> > Because it's further increasing the size by something unbounded in size,
> > which'll not uncommonly be large? It makes a fair amount of sense to
> > partition by multiple columns at once (using the expression syntax).
> 
> How about gathering some actual evidence on the point --- ie, how big
> a partition expression do you need to make it fall over?

You'd need a 2kB expression (after compression) in
relpartbound before you hit a problem here.  I wouldn't worry about it
at this stage ...

Not on point, but this conversation reminded me of
https://www.commandprompt.com/blog/grant_schema_usage_to_2500_users_no_can_do/
wherein you needed 2500 roles in an ACL column before it became a
problem -- and the project's stance is not to bother supporting that
case.

-- 
Álvaro Herrera                https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services