Forget how the oracle sys user password changes, and Oracle 11g default user name and password

Forget the user in addition to SYS, SYSTEM user's login password

CONN SYS/PASS_WORD AS SYSDBA; --用SYS (或SYSTEM)用户登录
ALTER USER user_name IDENTIFIED BY "newpassword"; --修改用户的密码，密码不能是数字开头，否则会出现：ORA-00988: 口令缺失或无效

Forget the user SYS, or SYSTEM user's password

CONN SYS/PASS_WORD AS SYSDBA; --如果是忘记SYSTEM用户的密码，可以用SYS用户登录。
ALTER USER SYSTEM IDENTIFIED BY "newpassword";

CONN SYSTEM/PASS_WORD AS SYSDBA; --如果是忘记SYS用户的密码，可以用SYSTEM用户登录。
ALTER USER SYS IDENTIFIED BY "newpassword";

SYS, SYSTEM user passwords are forgotten

Oracle provides two authentication modes, one is the OS authentication, another authentication password file, if it is the first way to modify the password using the following method:

　　sqlplus /nolog;
　　connect / as sysdba
　　alter user sys identified by newpassword;
　　alter user system identified by newpassword;

If the second method can be used ORAPWD.EXE tool to change the password. Open a command prompt, type the following command:

orapwd file=D:\oracle10g\database\pwdctcsys.ora password=newpassword

The command to re-generate the password file database. In the ORACLE_HOME directory \ at the location of the password file database directory. This password is to modify the sys user password. sys passwords of other users in addition to not change. Also under way to modify the password, set finished, restart the service, again landed on it.

orapwd file=pwdxxx.ora password=newpassword entries=10

Oracle 11g default user name and password

When installing ORACLE, if no reset for the following user password, default password as follows:

Username / password login credentials Description
SYS / change_on_install SYSDBA or SYSOPER can not log in to NORMAL, can be used as the default system administrator
System / Manager SYSDBA or SYSOPER NORMAL can not log on, it can be used as the default system administrator
sysman / oem_temp sysman as of oms username
scott / tiger NORMAL ordinary users
aqadm / aqadm SYSDBA or NORMAL advanced Queuing administrator
Dbsnmp / dbsnmp SYSDBA or NORMAL copy administrator

Log on as: Role refers to the time specified login, oracle11g carve SYSDBA and default two kinds. When installing Oracle 10g, suggesting that create the database, you are prompted to enter the password you created at the same time, if this time you enter a password to log in when the database user name sys corresponding password should be entered when you create the database password. Instead of the default change_on_install.

Reference: https://www.cnblogs.com/jiangxinnju/p/7928029.html