converting FK's to "DEFERRABLE"

In order to try to reduce lock contention on my FK's, I need to
convert them to DEFERRABLE. The straightforward way is to drop and
recreate the modified FK. However, on a table with 65M rows, this is
taking quite some time. I'm afraid how long it will take to update
both FK's on my 170M+ row table...

Anyhow, is there some trickier way to make an FK deferrable? Mucking
with the system tables, perhaps?

I see that pg_restore has a way to turn off triggers during the data
load. If I can guarantee no updates to the table in question, can I
use that same code to disable triggers, drop+add the FK, then
re-enable triggers? Or will that not avoid the check when I create
the new FK?

I'd like to avoid a few hours of downtime while updating these
triggers.

Thanks.

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Vivek Khera, Ph.D. Khera Communications, Inc.
Internet: khera(at)kciLink(dot)com Rockville, MD +1-301-869-4449 x806
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