On Sun, Mar 6, 2011 at 3:41 AM, Martijn van Oosterhout
<klep...@svana.org> wrote:
> The other option is visibility data in the index. Doubles the size of
> your indexes though.

Also requires both table and index be locked while you update both so
you don't get race conditions.  so has a real performance impact there
as well.

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