On 10/14/15 1:50 PM, Andres Freund wrote:
> On October 14, 2015 7:45:53 PM GMT+02:00, Alvaro Herrera 
> <alvhe...@2ndquadrant.com> wrote:
>> Amir Rohan wrote:
>>> it does fail the "dependent options" test:
>>> $ postgres -C "archive_mode"
>>> on
>>> $ postgres -C wal_level
>>> minimal
>>> no errors, great, let's try it:
>>> $ pg_ctl restart
>>> FATAL:  WAL archival cannot be enabled when wal_level is "minimal"
>> This complaint could be fixed we had a --check-config that runs the
>> check hook for every variable, I think.

I think that would be widely useful and fairly uncontroversial.

> The problem is that this, and some others, invariant is checked outside the 
> GUC framework. Which we should probably change, which IIRC will require some 
> new infrastructure.

In the extreme, this problem is not solvable (halting problem).  If we
had a dry-run checking functionality, there would probably be more
incentive to normalize many of the common dependency cases into a
declarative system.

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