What does "tuple concurrently updated" mean?

From: "Florian G(dot) Pflug" <fgp(at)phlo(dot)org>
To: pgsql-General <pgsql-general(at)postgresql(dot)org>
Subject: What does "tuple concurrently updated" mean?
Date: 2005-04-25 08:32:57
Message-ID: 426CAB39.7090708@phlo.org
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Hi

During a batch load of records (using COPY) I got the following
postgres error today "tuple concurrently updated".

What could have caused this?
The only two occurences of the message in the source is in
the functions simple_head_delete and simple_heap_update
in src/backend/access/heap/heapam.c

greetings, Florian Pflug

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