That's correct. You have to do it that way or the system in recovery
mode can start to consume the new segment file before it has been
completely copied over yet.
Does pg_standby take care of this by checking file sizes or the like?
In my testing with scp, we never experienced any problems, but I wonder
if we were somehow "just lucky."
David
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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match