I said:
> "Tim Lynch" <[EMAIL PROTECTED]> writes:
>> i don't see a core file.

> Check that you are starting the postmaster with "ulimit -c unlimited";
> this is not the default on most Linuxen, so you may have to add that to
> the start script.  Also note that the postmaster never does a chdir,
> so if it drops core it will be in the same directory the start script
> was running in.

Drat, I forgot to mention an important corollary: make sure the
postmaster is started in a directory that's writable by the postgres
user, else you'll get no corefile.

(For completeness I'll mention here that when individual backends dump
core, it's in the $PGDATA/base/nnn/ directory of the database they're
connected to.  So you can easily distinguish a postmaster core from
a backend core, just by where it was dropped.)

                        regards, tom lane

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