about Oracle Memory Utilization is 99.54%
近期通过Oracle Enterprise Manager发现显示 Oracle Memory Utilization 一直在98%以上，
如下所示
Alert History for Last 24 Hours
Severity Timestamp Message Details
Nov 1, 2012 2:50:43 AM Memory Utilization is 99.54% -
Oct 31, 2012 10:40:43 PM Memory Utilization is 95.96% -
Oct 31, 2012 9:30:43 PM Memory Utilization is 99.09% -
Oct 31, 2012 5:30:43 PM Memory Utilization is 98.43% -
Oct 31, 2012 2:55:43 AM Memory Utilization is 99.64%
请教一下，这个Oracle Memory Utilization显示的百分比是Oracle已经使用的内存占总物理内存的百分比吗？99%意味着什么？如果不是，怎么样查看Oracle占用的总内存大小？