Hi Doug,

I've managed to run some simple diagnostic tests and here's what I got

[mate...@bebe log]$ grep -i " checkout " *.log|wc -l
3949
[mate...@bebe log]$ grep -i "checkin " *.log|wc -l
251

There's a great difference in the number of checkins to cache and
checkouts from it.
Could you please outline it a bit more a block cache mechanisms and
design concepts.

Could it be that having 3 scanners, and one of them being the long
living one, that long living scanner cases a block cache space
exhaustion?

My app has 3 scanners, and one of them is used for a much longer
period of time than the other two which are just fetching single row
and get destroyed.

The first long living scanner is actually used for sweeping through
the much larger table than the other two.


Mateusz

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