Robert Haas <robertmhaas@gmail.com> writes:
> In a way I agree, but I think the reality is that some very large
> percentage of people who enter single user mode do so because of a
> wraparound-induced shutdown, and what they need is an easy way to get
> the system back on line. Running a catalog query to look for
> undropped temp tables and then dropping them one by one using DROP
> TABLE is not what they want. They want to be able to run one or two
> commands and get their database back on line.
So if we think we can invent a "MAGICALLY FIX MY DATABASE" command,
let's do that. But please let's not turn a well defined command
like VACUUM into something that you don't quite know what it will do.
I'm especially down on having squishy DWIM logic in a last-resort
operating mode; the fact that some people only use it in a certain way
is a poor excuse for setting booby traps for everybody.
Something I could get behind as a less dangerous way of addressing
this issue is to define DISCARD TEMP, in single-user mode, as dropping
the contents of all temp schemas not just one.
regards, tom lane