> Now of course this isn't Nirvana, you must pay somewhere ;-) and our
> weak spot is the need for VACUUM.  But you have no need to fear large
> individual transactions.

No need to fear long running transactions other than their ability to
stop VACUUM from doing what it's supposed to be doing, thus possibly
impacting performance.

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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

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