On Tue, 2014-08-26 at 21:00 +0100, Greg Stark wrote:
> Well fundamentally the reason the visibility information is with the
> user data is so that we don't need to do two i/os to access the data.
> The whole point of hint bits is to guarantee that after some amount of
> time you can read data directly out of the heap page and use it
> without doing any additional I/O.
If the data is that static, then the visibility information would be
highly compressible, and surely in shared_buffers already.
(Yes, it would need to be pinned, which has a cost.)
Regards,
Jeff Davis
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