On Nov 23, 2008, at 3:18 PM, Tom Lane wrote:
So it seems like we do indeed want to rejigger autovac's rules a bit to account for the possibility of wanting to apply vacuum to get visibility bits set.
That makes the idea of not writing out hint bit updates unless the page is already dirty a lot easier to swallow, because now we'd have a mechanism in place to ensure that they were set in a reasonable timeframe by autovacuum. That actually wouldn't incur much extra overhead at all, except in the case of a table that's effectively write-only. Actually, that's not even true; you still have to eventually freeze a write-mostly table.
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