I would like to upgrade both OS kernel and PGsql version , so in my opinion the best way to handle it is to *backup* the data in .tar
Just remember if you're going from 7.3.2 => 7.4.x or 8.0 then you'll need to use pg_dump not just tar up the directories. If you do use tar, remember to backup *all* the directories.
-- Richard Huxton Archonet Ltd
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TIP 9: the planner will ignore your desire to choose an index scan if your
joining column's datatypes do not match
