Peter Eisentraut <peter_e@gmx.net> writes:
> Tom Lane wrote:
>> Peter Eisentraut <peter_e@gmx.net> writes:
>>> Is there a way to query the database system identifier that
>>> pg_controldata outputs from SQL?
>>
>> Don't think so. Do you have a use-case for providing a function to
>> return that?
> I'd like to find out whether two connections are really to the same
> server.
Hmm. Seems a bit of an odd case, but on the other hand there might be
applications for it in connection with management of backups and
WAL-shipping and so forth. I have no objection to adding a function.
regards, tom lane