Scott Frankel <frankel@xxxxxxxxxxxxx> writes: > Any suggestions for how best to launch one of two different versions > of pg installed on the same machine? > I have both 8.3 and 8.1 installed on a MacBookPro (OS X 10.5.2). I > stopped the 8.3 postmaster using pg_ctl in order to roll back to 8.1. > Problem is, now I can't seem to start the server using either version. It looks like you're trying to use the same data directory for both versions, which won't work. They're not compatible on-disk. > When I launch 8.1 with pg_ctl, it yields a "postmaster starting" > message; but then a status check shows that the server is not > running. Issuing the same commands for 8.3, I get similar results. Looking into the postmaster log file (your -l specification) might yield some insight. pg_ctl itself doesn't really know why the postmaster failed to start. regards, tom lane
