Protecting Your Database: Specifying Passwords for Users SYS and SYSTEM (70)

The clauses of the CREATE DATABASE statement used for specifying the passwords for
users SYS and SYSTEM are:
■ USER SYS IDENTIFIED BY password
■ USER SYSTEM IDENTIFIED BY password

If you omit these clauses, these users are assigned the default passwords
change_on_install and manager, respectively. A record is written to the alert log
indicating that the default passwords were used. To protect your database, you should
change these passwords using the ALTER USER statement immediately after database
creation.

Oracle strongly recommends that you specify these clauses, even though they are
optional in this release of Oracle Database. The default passwords are commonly
known, and if you neglect to change them later, you leave database vulnerable to
attack by malicious users.

為sys,system使用者指定密碼
語句分別為 :
user sys identified by
user system identified by

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