More suggestions:
(1) At startup, postmaster checks for an XID, if it is close to a problem,
force a vacuum.
(2) At "sig term" shutdown, can the postmaster start a vacuum?
(3) When the XID count goes past the "trip wire" can it spontaneously
issue a vacuum?
NOTE:
Suggestions 1 and 2 are for 8.0 and prior. 3 is for later than 8.0.1
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