> I guess they multiplied this time with number of prefetchers? You are right. From the System Monitor Guide: > At the database and table space levels, this element includes the value of pool_async_read_time. < see http://publib.boulder.ibm.com/infocenter/db2luw/v8/index.jsp?topic=/com.ibm.db2.udb.doc/admin/r0001241.htm Regards, Udo -- Speedgain for DB2 - the DB2 monitor http://www.itgain.de/en/produkte/speedgain.html