This is a revised patch originated by Junji TERAMOTO for HEAD.
[BTree vacuum before page splitting]
http://archives.postgresql.org/pgsql-patches/2006-01/msg00301.php
I think we can resurrect his idea because we will scan btree pages
at-atime now; the missing-restarting-point problem went away.
Have I missed something? Comments welcome.
Regards,
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ITAGAKI Takahiro
NTT Open Source Software Center