Excerpts from David Fetter's message of mié dic 21 18:59:13 -0300 2011: > If not, we'll have to do some extra work on the patch as described > below. Thanks to Kevin Grittner for coming up with this :) > > - Use a header bit to say whether we've got a checksum on the page. > We're using 3/16 of the available bits as described in > src/include/storage/bufpage.h. > > - When that bit is set, place the checksum somewhere convenient on the > page. One way to do this would be to have an optional field at the > end of the special space based on the new bit. Rows from pg_upgrade > would have the bit clear, and would have the shorter special > structure without the checksum.
If you get away with a new page format, let's make sure and coordinate so that we can add more info into the header. One thing I wanted was to have an ID struct on each file, so that you know what DB/relation/segment the file corresponds to. So the first page's special space would be a bit larger than the others. -- Álvaro Herrera <alvhe...@commandprompt.com> The PostgreSQL Company - Command Prompt, Inc. PostgreSQL Replication, Consulting, Custom Development, 24x7 support -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
