Mark Steben <mark.steben@xxxxxxxxxxxxxxxxx> writes: > I am planning a 9.,2 to 9.4 upgrade using pg_upgrade with the link option. > Thanks first to Tom Lane for the prompt answer last week. I have installed > 9.4 in the same disk as 9.2 and running pg_upgrade with the --check option > I get this error: > ERROR: could not load library > "/usr/local/pgsql_production/lib/plpgsql.so": > /usr/local/pgsql_production/lib/plpgsql.so: undefined symbol: errcontext This would seem to indicate that you are trying to load a 9.2 library into the 9.4 server or vice versa. You really need to have different lib directories, as well as different bin directories, for the two versions. 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