rwclient runtime consume hight memory

Hello Community,
we are using  Oracle Forms and Reports 11g (11.1.2.1.0) on a Solaris 10 64-bit Zone. Running reports using "rwclient.sh " shows that the rwclient runtime consumes hight memory as shown by
prstat, that could leed the machine swap:

PID USERNAME  SIZE   RSS STATE  PRI NICE      TIME  CPU PROCESS/NLWP
  5733 svc_iala 1218M  163M sleep   30    0   0:00:02 0.3% rwclient/37

Do a pmap -x <pid> on that process, shows that a large "amount of  anonymous  memory" is used:

         Address     Kbytes        RSS       Anon     Locked Mode   Mapped File
0000000100000000        176        176          -          - r-x--  rwclient
000000010012A000         16         16         16          - rwx--  rwclient
000000010012E000       2888       1568       1568          - rwx--    [ heap ]
0000000100400000      57344      57344      57344          - rwx--    [ heap ]
FFFFFFFB5C400000        120        120          -          - r-x--  libzrc.so