In Oracle 11g, the Administrator sys and system passwords are unavailable. Solution

When installing the Oracle 11g Database, the password setting item is skipped. When you need to use sys and system later, the system always prompts that the password is incorrect. Here, we provide a way to reset these user passwords.

Use sqlplus to log on to the database:

Bash-3.00 $ sqlplus/as sysdba

SQL * Plus: Release 10.2.0.2.0-Production on Fri Nov 30 16:29:59 2012

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Connected:
Oracle Database 10g Enterprise Edition Release 10.2.0.2.0-Production
With the Partitioning, OLAP and Data Mining options

SQL> alter user sys identified by admin;

User altered.

SQL> conn sys/admin as sysdba;
Connected.
SQL> alter user system identified by admin;

User altered.

Now, you can use your own password to log on to the database.