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--使用SYS.USER$.PASSWORD恢复的历史密码不区分大小写,
--使用SYS.USER$.PARE4恢复的历史密码却严格区分大小写,


SQL> select password,spare4 from user$ where name = 'EASDBA';

PASSWORD
--------------------------------------------------------------------------------
SPARE4
--------------------------------------------------------------------------------
20C3BA8582A406D9
S:CBC48054705839F2B2A09EEF70D4A6700F3415E10D54CA8BD90C09EA8FC1


SQL> alter user EASDBA identified by values '20C3BA8582A406D9';

User altered.

SQL>  select password,spare4 from user$ where name = 'EASDBA';

PASSWORD
--------------------------------------------------------------------------------
SPARE4
--------------------------------------------------------------------------------
20C3BA8582A406D9


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