Oracle Database Discussions

Hey I have asked this question before but no solution has been provided me. I have been facing a very serious problem. I have oracle 11g on windows 2003 on 64 bit machine. With 2 processor 8GB RAM. Sga/pga automatically features turn on and 6GB assign to memory_max_target, memory_target . My problem is when I run update 600 hundred statements in one go and every update statement update record between 1 to 30000 and after 20 records I use commit. But after 20 to 30 record oracle go down (shutdown) when i check alert log It advise to check Trace file and in trace file I got this error ORA-02103: PCC: inconsistent cursor cache (out-of-range cuc ref). I turn on my cache sharing to force but no way. Is there any other fast way to update records??

cursor_sharing string force
cursor_space_for_time boolean FALSE
open_cursors integer 300
session_cached_cursors integer 50

my update statement are following
Update jg_6july_dg0 Set Operator_code= '915724' where Operator_code= '015325';
Update jg_6july_dg0 Set Operator_code= '915715' where Operator_code= '015323';
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.Update jg_6july_dg0 Set Operator_code= '915712' where Operator_code= '015374';

Cursor Caching I think is not a problem either it is a oracle bug or I’m doing something wrong. I can’t believe that oracle does not have solution for such little problem. My question is why oracle shutdown?? Waiting for you reply