On 19.08.2011 21:06, Gokulakannan Somasundaram wrote:
If you are following the same design that Heikki put forward, then there is
a problem with it in maintaining the bits in page and the bits in visibility
map in sync, which we have already discussed.

Are you referring to this: http://archives.postgresql.org/pgsql-hackers/2010-02/msg02097.php ? I believe Robert's changes to make the visibility map crash-safe covers that. Clearing the bit in the visibility map now happens within the same critical section as clearing the flag on the heap page and writing th WAL record.

  Heikki Linnakangas
  EnterpriseDB   http://www.enterprisedb.com

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