"Min Xu (Hsu)" <[EMAIL PROTECTED]> writes: > ... As you said, however, experimental results > shows fetching read-only lines didn't help, which led me wonder whether the > second scenario your described was really happening.
I don't know --- we haven't tried it. I do intend to work up some patches for these ideas, and then we can test them. Or, if you happen to be wide awake at the moment, feel free to take a shot at it ... I'm out of steam and won't get to it before tomorrow... regards, tom lane ---------------------------(end of broadcast)--------------------------- TIP 6: explain analyze is your friend