| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Michael Paquier <michael(dot)paquier(at)gmail(dot)com> |
| Cc: | Jeff Janes <jeff(dot)janes(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: new autovacuum criterion for visible pages |
| Date: | 2016-08-12 00:01:14 |
| Message-ID: | 31535.1470960074@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Michael Paquier <michael(dot)paquier(at)gmail(dot)com> writes:
> In short, autovacuum will need to scan by itself the VM of each
> relation and decide based on that.
That seems like a worthwhile approach to pursue. The VM is supposed to be
small, and if you're worried it isn't, you could sample a few pages of it.
I do not think any of the ideas proposed so far for tracking the
visibility percentage on-the-fly are very tenable.
regards, tom lane
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