On Sat, Oct 23, 2010 at 8:11 PM, Tom Lane <[email protected]> wrote: > Robert Haas <[email protected]> writes: >> Why would you need to lock out type comparisons? > > Didn't you get the point? The hazard is to a concurrent process that is > merely trying to load up its enum-values cache so that it can perform an > enum comparison. I don't want such an operation to have to block, > especially not against something that's trying to acquire a more or less > exclusive lock.
Hmm, yeah, I missed the point. Sorry. I suppose you could fix this by always updating every row, and storing in each row the total count of elements (or a random number). Then it'd be obvious if you'd read an inconsistent view of the world. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-hackers mailing list ([email protected]) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
