select sum(getmisses)/sum(gets)*100 pool_size from v$rowcache

Connect time(ms): 63

Connected to jdbc:oracle:thin:@LarrySERVER:1521:wind
Driver       Oracle JDBC driver
Version      8.1.7.1.0

Query time & data xfer(ms): 31

POOL_SIZE
23.92367906066536203522504892367906066536

