Re: How to cancel a query if SIGINT does not work?

Adam Witney <awitney(at)sgul(dot)ac(dot)uk> writes:
> On 19/8/05 5:27 pm, "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>> In theory that should always work. What PG version is this? Can you
>> attach to the stuck backend with gdb and get a stack trace?

> Am not particularly familiar with gdb, but if you tell me the steps I will
> do it and report back

Think I've posted this before, but:

Determine PID of backend you are interested in, eg with ps

As postgres user, do
$ gdb /path/to/postgres-executable PID-of-process
gdb prints a bunch of junk
gdb> bt
... copy and paste the output given here ...
gdb> quit
gdb: ok to detach? y
$

If you get a pile of purely numeric output from bt, it's useless
(means you're running symbol-stripped executables). I'm hoping
for at least some function names.

regards, tom lane