On 2013-08-22 21:51:22 +0900, Fujii Masao wrote: > On Thu, Aug 22, 2013 at 6:43 AM, Vik Fearing <vik.fear...@dalibo.com> wrote: > > After someone in IRC asked if there was an equivalent to MySQL's > > server_id, it was noted that we do have a system identifier but it's not > > very accessible. > > > > The attached patch implements a pg_system_identifier() function that > > exposes it. > > What's the use case? > > IIUC, PostgreSQL's system identifier is not equal to MySQL server-id. > In PostgreSQL, in replication, the master and all the standbys must > have the same system identifier. OTOH, in MySQL, they have the different > server-ids. No?
FWIW I've wished for that function repeatedly. Mostly just to make sure I am actually connected to the same "network" of replicas and not some other. It's also useful if you're providing support for a limited number of machines and you want some form of identifying a node. Greetings, Andres Freund -- Andres Freund http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
