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Table has duplicate keys, what did I do

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Somehow I have managed to have two tables with duplicate keys.
In both tables, the key is an integer, filled from a sequence.
There is only 1 duplicated entry in each table: in the first
table, there are two ID "1"s, and in the second table there are
two ID "123456"s (the second table entry is linked to the first
table's ID 1).

I noticed this because a pg_dump followed by a psql < dumpfile
will not reload.

I've figured out a fix: a script that cleans the dump file, removing
the two duplicate lines (leaving the original).

But, mostly, I'm wondering how I managed to get in this state,
if it was something I did, or perhaps caused by killing the
postmaster the wrong way (I don't think I ever did this, but
maybe), or a crash.

I did do a brief search, didn't find anything seemingly related to this.

Thanks,

j
-- 
John Gateley <gateley@xxxxxxxxxx>

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TIP 2: Don't 'kill -9' the postmaster

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