I'm looking at some 7.3.4 vacuum output, and at first glance it does not
appear that vacuum is reclaiming any dead tuple space if there is even a
single open transaction, even if the open transaction does not in any way
reference the table being vacuumed. Is that correct? Is the behavior
different in later versions?
Ed
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TIP 9: the planner will ignore your desire to choose an index scan if your
joining column's datatypes do not match
