"Luke Lonergan" <[EMAIL PROTECTED]> writes: > Two passes is the state-of-the-practice on external disk sorts.
There is no such thing as a fixed number of passes regardless of
available memory and size of the data.
regards, tom lane
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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
