[GENERAL] What does "tuple concurrently updated" mean?

[Florian G. Pflug]

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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