> I really dislike the notion of turning off checkpointing. What if the
> backup process dies or gets stuck (eg, it's waiting for some
> operator to
> change a tape, but the operator has gone to lunch)? IMHO, backup
> systems that depend on breaking the system's normal
> operational behavior
> are broken. It should be sufficient to force a checkpoint when you
> start and when you're done --- altering normal operation in between is
> a bad design.
But you have to prevent log files reusing while you copy data files.
That's why I asked are 3 commands from pg_copy required and couldn't
be backup accomplished by issuing single command
ALTER SYSTEM BACKUP <dir | stdout (to copy data to client side)>
(even from pgsql) so backup process would die with entire system -:)
As for tape changing, maybe we could use some timeout and then just
stop backup process.
Vadim