On Thu, Mar 13, 2014 at 12:11 PM, Tom Lane <t...@sss.pgh.pa.us> wrote: > Andres Freund <and...@2ndquadrant.com> writes: >> On 2014-03-13 11:26:10 -0400, Robert Haas wrote: >>> I have however had the thought before that it would be nice to allow >>> for callbacks of invalidation functions of some kind even on catalogs >>> that don't have catcaches. > >> Unfortunately the format catcache invalidations have is pretty tightly >> tied to the hash function catcaches use internally. And we need >> something that can be included in the WAL, otherwise it won't work on HS >> nodes. > > Note that the existence of a cache doesn't mean it's necessarily > populated. In this example, a catcache on pg_seclabels could be used just > fine, as long as it wasn't used to load labels for large objects. Even if > it were never used at all, it would still provide a usable conduit for > invalidation events.
That'd need some commenting, but it seems like a possibly workable approach that wouldn't require changing much. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
