Andreas Pflug <pgadmin@pse-consulting.de> writes:
> Tom Lane wrote:
>> I'm not sure you can expect that to work. The system is not built to
>> guarantee instantaneous response to mode changes like that.
> Um, as long as xlog writing stops immediate recycling when
> pg_start_backup is executed everything should be fine, since archived
> logs are not expected to be present until pg_stop_backup is done.
Wrong. You forgot about all the *other* behaviors that change depending
on XLogArchivingActive, like whether CREATE INDEX gets archived or
just fsync'd. I don't think it makes sense for CREATE INDEX to change
that behavior in midstream, even assuming that it noticed the flag
change instantly.
regards, tom lane