Value of result_cache_max_size is not changing

   ** Oracle is currently working on an SR on this topic, while we are diagnosing the problem we are opening up this question to our user community so they can add perspective to the solution based on their real world experience **

Problem : Value of result_cache_max_size is not changing

Database:  11.1.0.6

OS :  Oracle Solaris on SPARC (64-bit)

Description : Value of result_cache_max_size is not changing

SQL> show parameter result_cache_max_size

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
result_cache_max_size                big integer 0

SQL> alter system set result_cache_max_size=5m;

System altered.

SQL> show parameter result_cache_max_size