What I must change that non root user will see only own databases?
You can't at the moment. There has been some discussion about this, but at present read access to the system catalogues is available to everyone.
That doesn't mean they can connect to the database (that's controlled by your pg_hba.conf file). It does mean you can see what databases are available though.
-- 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
