Tom Lane cc59049daf Improve handling of prune/no-prune decisions by storing a page's oldest ...

unpruned XMAX in its header.  At the cost of 4 bytes per page, this keeps us
from performing heap_page_prune when there's no chance of pruning anything.
Seems to be necessary per Heikki's preliminary performance testing.

2007-09-21 21:25:42 +00:00

4.3 KiB

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