Thanks all you guys..:)
Now I've upgraded to 4.2.1.9 is the IC30181 in there?
During that time what I did is to backup db more often, some time it will be
resetted..
Wanda was right also most of the time that it was not reduce log because
some other process was running but that is the reason to make dbbackup be
triggered as well..

Thanks again..
regards,

Thida Chintawongvanich

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