大小写敏感控制的是对象名称和数据内容，实例生命周期内是不可更改的。
可用搜索相关的文档说明
https://eco.dameng.com/community/post/20221201101527YM291SYNNFEVD9YS92

可以尝试下BINARY
SELECT * FROM TABLE_1 WHERE BINARY C1 = 'a'

如果使用binary 和修改参数都无法使用,可以尝试这种方法，原理和binary 类似
create table t (id int, nickname varchar(20));
insert into t values( 1, 'dpPF,V.💠%');
insert into t values( 2, 'dpPf,V.💠%');
insert into t values( 3, 'DPPf,V.💠%');
insert into t values( 4, 'dPPf,V.💠%');
insert into t values( 5, 'DpPf,V.💠%');
insert into t values( 6, 'DPPf,V.💠%');
commit;

SQL> select * from t where UTL_RAW.cast_to_raw(NICKNAME) =UTL_RAW.cast_to_raw('DpPf,V.💠%');

LINEID ID NICKNAME

1 5 DpPf,V.💠%

SQL> select UTL_RAW.cast_to_raw('DpPf,V.💠%');

LINEID UTL_RAW.CAST_TO_RAW('DpPf,V.💠%')

1 0x447050662C562EF09F92A025

used time: 0.598(ms). Execute id is 7535.
SQL> select BINTOCHAR('0x447050662C562EF09F92A025');

LINEID BINTOCHAR('0x447050662C562EF09F92A025')

1 DpPf,V.💠%