"Jim C. Nasby" <[EMAIL PROTECTED]> writes: > Is there any ALTER that would require blocking selects?
DROP INDEX, for certain.
> Even stuff like
> drop and rename should be protected by versioning, no?
No. System-catalog changes are always READ COMMITTED mode.
regards, tom lane
---------------------------(end of broadcast)---------------------------
TIP 6: Have you searched our list archives?
http://archives.postgresql.org
