On Tue, 2008-06-10 at 11:02 +0530, Pavan Deolasee wrote:
In most of the cases where the old transactions quickly go away, and
for large tables, the second scan will be very limited. In the worst
case, we might incur the overhead of conditional waits without any
success.
Looks good.
- An
Here is a WIP patch based on the discussions here:
http://archives.postgresql.org/pgsql-hackers/2008-05/msg00863.php
The attached WIP patch improves the LAZY VACUUM by limiting or
avoiding the second heap scan. This not only saves considerable time
in VACUUM, but also reduces the double-writes of
