I'd like to keep my current installation (8.3.3) alive and running while installing and running 9.1.2 on the same server. Can I do this using only the existing postgres superuser account? I'd want to create two different initdb locations, and run the versions on different ports, of course, but it seems like the superuser's LD_LIBRARY_PATH would be an issue. Whichever .../lib dir it points to, would be the only effective one, and the "other" version's programs wouldn't work. Is there a way around this? Or am I thinking about it all wrong?
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