> > > > What's the use-case for changing the variable on the fly anyway?
Seems a
> > better
> > > > solution is just to lock down the setting at postmaster start.
> > 
> > I guess that the use case is more for a WAL based replicate, that 
> > has/wants a different setting. Maybe we want a WAL entry for the
> > or force a log switch (so you can interrupt the replicate, change
> > setting
> > and proceed with the next log) ?
> > 
> > Maybe a 3rd mode for replicates that ignores 0 CRC's ?
> Well, wal_checksum allows you to have this turned ON for the main
> and OFF on a Warm Standby.

Ok, so when you need CRC's on a replicate (but not on the master) you
turn it
off during standby replay, but turn it on when you start the replicate
for normal operation.


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