On Mon, Jun 6, 2016 at 11:44 AM, Andres Freund <and...@anarazel.de> wrote:
>> In terms of diagnostic tools, you can get the VM bits and
>> page-level bits using the pg_visibility extension; I wrote it
>> precisely because of concerns like the ones you raise here.  If you
>> want to cross-check the page-level bits against the tuple-level bits,
>> you can do that with the pageinspect extension.  And if you do those
>> things, you can actually find out whether stuff is broken.
> That's WAY out ouf reach of any "normal users". Adding a vacuum option
> is doable, writing complex queries is not.

Why would they have to write the complex query?  Wouldn't they just
need to run that we wrote for them?

I mean, I'm not 100% dead set against this option you want, but in all
honestly, I would never, ever tell anyone to use it.  Unleashing
VACUUM on possibly-damaged data is just asking it to decide to prune
away tuples you don't want gone.  I would try very hard to come up
with something to give that user that was only going to *read* the
possibly-damaged data with as little chance of modifying or erasing it
as possible.

Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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