Those who have been with the community from long ago might remember
discussion about implementing a undo log.  The big advantage of this is
that it allows UPDATE to _replace_ rows and limits the amount of cleanup
required for UPDATEs.

I am hoping that with HOT we will no longer have any need to even
consider undo.

  Bruce Momjian  <[EMAIL PROTECTED]>

  + If your life is a hard drive, Christ can be your backup. +

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TIP 9: In versions below 8.0, the planner will ignore your desire to
       choose an index scan if your joining column's datatypes do not

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