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Date: Tue, 5 May 92 12:02:55 -0700
From: ambdata@dpi.inpe.br (Banco de Dados Ambiental)
Subject: vacuum
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I am trying to vacuum (v3r1) a database and I am quite sure I have no other vacu
   um cleaner running. Why do I receive this message?

Query sent to backend is "vacuum "
WARN:May  5 16:37:57:can't create lock file -- another vacuum cleaner running?

Can someone tell me more about the vacuum cleaner?