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關于密碼版本的問題：

SELECT USERNAME,PASSWORD_VERSIONS FROM DBA_USERS;

USERNAME PASSWORD_VERSIONS

------------------------------ -----------------

JONES 10G 11G

ADAMS 10G 11G

CLARK 10G 11G

PRESTON 11G

BLAKE 10G

The passwords for accounts?jones,?adams, and?clark?were originally created in Release 10gand then reset in Release 11g. Their passwords, assuming case sensitivity has been enabled, are now case sensitive, as is the password for?preston. However, the account for?blake?is still using the Release 10gstandard, so it is case insensitive. Ask him to reset his password so that it will be case sensitive, and therefore more secure.

關于限制SYS用戶的密碼嚴格區分大小寫：

orapwd file=orapw entries=100 ignorecase=n

Enter password for SYS: password

This creates a password file called?orapwd. Because?ignorecase?is set to n (no), the password entered for the?password?parameter will be case sensitive. Afterwards, if you connect using this password, it succeeds—as long as you enter it using theexactcase sensitivity in which it was created. If you enter the same password but withdifferentcase sensitivity, it will fail.

If you set?ignorecase?to?y, then the passwords in the password file are case insensitive, which means that you can enter the password using any capitalization that you want.

If you imported user accounts from a previous release and these accounts were created with?SYSDBA?or?SYSOPER?privileges, then they will be included in the password file. The passwords for these accounts are case insensitive. The next time these users change their passwords, and assuming case sensitivity is enabled, the passwords become case sensitive. For greater security, have these users change their passwords.

更多詳情，參考文檔：

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