how to avoid that a postgres session eats up all the memory

Hi,

I just literally trashed my test server with one delete statement
because the psql used up all its memory and started to swap like crazy.

my delete looked like this

DELETE FROM table_foo WHERE bar_id IN (SELECT DISTINCT bar_id FROM bar
LEFT JOIN ... LEFT JOIN ... LEFT JOIN .... WHERE table.bar_id IS NULL
AND ...)

so basically it runs a select to see what entries do not have any
reference data and then should delete them all.

Now, my question is. How can I setup postgres to not use up all the
memory and then make the server useless. How can I set it up, so it dies
with "out of memory" before I have to restart the server.

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[ Clemens Schwaighofer -----=====:::::~ ]
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