"xsun" <xu2002261@xxxxxxx> writes: > When the psql server is started under Linux platform, in /tmp directory > there is a lock files named ".s.PGSQL.<port>.lock". So I want to know what > is the function of this lock file? It prevents multiple postmasters from trying to use the same socket file. > And does the server work well without > this lock file? No. (Well, it will run, but you have no protection against accidentally starting another postmaster on the same port number.) > Additionally, I know that the file ".s.PGSQL.<port>" is used as the unix > domain socket file. But the file ".s.PGSQL.<port>.lock" makes me still > pazzled. Could you explain that? Thanks. We can't portably lock the socket file itself, so we make a separate ordinary file for locking purposes. regards, tom lane -- Sent via pgsql-admin mailing list (pgsql-admin@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-admin
