开发报告测试库上执行一段sql遇到以下错误

select ID,name
         ,decode(sign(sysdate-nvl(begin_date,sysdate)) + sign(nvl(invite_end_date,sysdate)-sysdate),2,1,0) showInviteCode
    From   JUSTIN
    where IS_DELETE = 0
    and   NVL(MAIL_DNS,' ')<> ' '
order by  convert(name,'ZHS16CGB231280','UTF8')
 
ORA-01482: unsupported character set
刚开始被错误提示信息误导了，以为是字符集不支持；查看视图发现不是这回事
SQL> select * from v$nls_valid_values where parameter='CHARACTERSET' and value='ZHS16CGB231280';
 
PARAMETER                      VALUE                          ISDEPRECATED
------------------------------ ------------------------------ ------------
CHARACTERSET                   ZHS16CGB231280                 FALSE

查看alert log也没有发现有价值的东西，metalink上搜一把，有篇文章说是内存错误，trace file里会出现ora-4031；
但是alert log里的ora-4031错误是12个小时之前报的了，不会到现在还存在吧；
尝试情况shared_pool
SQL> alter system flush shared_pool;

System altered.
但是依然报错，将shared_pool增大到300m
SQL> show parameter shared_pool

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
shared_pool_reserved_size            big integer 12M
shared_pool_size                     big integer 240M
SQL> alter system set shared_pool_size = 300m;

System altered.
这次执行成功了
看来这个covert函数跟shared_pool还是有很大关系的