Heikki Linnakangas wrote:
That's a clever trick, but I can't help thinking we really should have
an explicit field in the page header to indicate what kind of a page it
is. It would make life simpler for any external tools that want to peek
into pages, including migration utilities after a release or two. We've
also been talking about setting hint bits and doing some kind of retail
vacuuming in bgwriter with HOT. To do that, we need to identify heap
pages in the bgwriter. While heap pages can currently be identified by
the fact that they don't have a special area, it feels hackish, and we
might want to do something like that for index pages too in the future.
We now have a 16-bit pd_flags field in the page header. We could use a
few bits from that.
+1
or add one extra field
Zdenek
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TIP 6: explain analyze is your friend
