I did an upgrade on my database server this past weekend and the database fails to start. I checked /var/log/postgresql and found the reason: [root@slave ~]# ps aux | grep postgres root 5189 0.0 0.0 8128 956 pts/0 S+ 12:28 0:00 grep postgres [root@slave ~]# /etc/rc.d/postgresql start :: Starting PostgreSQL [BUSY] server starting [DONE] [root@slave ~]# ps aux | grep postgres root 5205 0.0 0.0 8128 960 pts/0 R+ 12:28 0:00 grep postgres [root@slave ~]# tail -n 50 /var/log/postgresql.log FATAL: database files are incompatible with server DETAIL: The data directory was initialized by PostgreSQL version 8.4, which is not compatible with this version 9.0.1. FATAL: database files are incompatible with server DETAIL: The data directory was initialized by PostgreSQL version 8.4, which is not compatible with this version 9.0.1. FATAL: database files are incompatible with server DETAIL: The data directory was initialized by PostgreSQL version 8.4, which is not compatible with this version 9.0.1. Does anyone know if this is a issue with PostgreSQL or with the way Arch Linux packages the upgrade? -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general