Stephan Szabo <[EMAIL PROTECTED]> writes:
> ... let you do the replace and keep reading (at the penalty that
> you've now got to have a way to know when to remove the
> various <something>s)

That is the hard part.  Mike's description omitted one crucial step:

6. The old "foo" goes away when the last open file handle for it is

I doubt there is any practical way for Postgres to cause that to happen
if the OS itself does not have any support for it.

                        regards, tom lane

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