prstat memory display on Solaris 10

When I issue the command "prstat -a", the memory displayed is not explainable. May be someone can help me with this.  

We know that the server has only 32Gigs of real memory and 20 Gigs of swap space. Why does it display "oracle" is using 924G of memory?  

Thanks.    

NPROC USERNAME SIZE RSS MEMORY TIME CPU     90 root 1221M 377M 0.0% 3:46:46 6.3%

   177 oracle 924G 878G 100% 0:42:15 0.2%

    96 applmgr 2672M 1254M 0.1% 0:30:07 0.1%

     2 srsuser 15M 13M 0.0% 0:00:00 0.0%

     1 noaccess 190M 88M 0.0% 0:33:48 0.0%

     4 gharibia 12M 5816K 0.0% 0:00:00 0.0%

     4 meigu 13M 1928K 0.0% 0:00:02 0.0%

     3 gchao 11M 24K 0.0% 0:00:04 0.0%

     7 cdeleon 32M 6048K 0.0% 0:00:00 0.0%

     2 bpham 9840K 2576K 0.0% 0:00:04 0.0%

     1 smmsp 7744K 1520K 0.0% 0:00:04 0.0%

     1 nagios 3176K 616K 0.0% 0:00:34 0.0%

     6 daemon 22M 4928K 0.0% 0:04:26 0.0%

Total: 394 processes, 933 lwps, load averages: 2.38, 2.41, 2.47

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