Hi,
I read the discussion at
http://archives.postgresql.org/pgsql-hackers/2011-01/msg00315.php
From what I can understand, going from/to unlogged to/from logged in
the wal_level == minimal case is not too complicated.
Suppose I try to write a patch that allows
ALTER TABLE tablename SET LOGGED (or UNLOGGED)
(proper sql wording to be discussed...)
only in the wal_level == minimal case: would it be accepted as a
"first step"? Or rejected because it doesn't allow it in the other
cases?
From what I got in the discussion, handling the other wal_level cases
can be very complicated (example: the issues in case "we *crash*
without writing an abort record").
Leonardo