Patrick Hatcher <[EMAIL PROTECTED]> writes:
> I'm running an update statement on about 12 million records using the
> following query:

> Update table_A
> set F1 = b.new_data
> from table_B b
> where b.keyfield = table_A.keyfield

What does EXPLAIN show for this?

Do you have any foreign key references to table_A from elsewhere?

                        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

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