On 4 August 2016 at 02:13, Bruce Momjian <br...@momjian.us> wrote:

> How do plan to clear the bitmask so it, over time, doesn't end up being
> all-set?

I don't have a plan, though thoughts welcome.

Similar situation that our current indexes don't recover from bloat, a
situation made worse by non-HOT updates.

So, we have a choice of which disadvantage to accept.


> Also, why not use this bitmap for all indexes, not just update chains?

I don't understand where you get this update chains thing from.

The bitmap can apply to multiple tuples on one page, which is described.

-- 
Simon Riggs                http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services


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