直接修改報ORA-01109: database not open：

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[oracle@prodb2 admin]$ . oraenv
ORACLE_SID = [prodb2] ? +ASM2
[oracle@prodb2 admin]$ sqlplus / as sysdba

SQL*Plus: Release 10.2.0.5.0 - Production on чǚ? 7? 6 02:24:48 2018

Copyright (c) 1982, 2010, Oracle.  All Rights Reserved.

Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bit Production
With the Partitioning, Real Application Clusters, OLAP, Data Mining
and Real Application Testing options

SQL> 
SQL> 
SQL> alter user sys identified by admin;
alter user sys identified by admin
                             *
ERROR at line 1:
ORA-01109: database not open

10g中修改密碼需要修改密碼文件：

cd $GRID_HOME/dbs

WINDOWS:

orapwd file=<ORACLE_HOME>/database/PWD<SID>.ora password=<sys_password>

UNIX:

orapwd file=<ORACLE_HOME>/dbs/orapw<SID> password=<sys_password>

測試：

節(jié)點2修改密碼：
[oracle@prodb2 ~]$ cd $ORACLE_HOME/dbs
[oracle@prodb2 dbs]$ orapwd file=orapw+ASM2 password=oracle force=y
[oracle@prodb2 dbs]$ sqlplus sys/oracle@asm2 as sysdba

SQL*Plus: Release 10.2.0.5.0 - Production on чǚ? 7? 6 02:43:25 2018

Copyright (c) 1982, 2010, Oracle.  All Rights Reserved.

Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bit Production
With the Partitioning, Real Application Clusters, OLAP, Data Mining
and Real Application Testing options

SQL> 

節(jié)點1測試：
[oracle@ocm1 admin]$ sqlplus sys/oracle@asm2 as sysdba

SQL*Plus: Release 10.2.0.5.0 - Production on чǚ? 7? 6 02:45:31 2018

Copyright (c) 1982, 2010, Oracle.  All Rights Reserved.

Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bit Production
With the Partitioning, Real Application Clusters, OLAP, Data Mining
and Real Application Testing options

SQL> show parameter remote_login_passwordfile

NAME                     TYPE           VALUE
------------------------------------ ---------------------- ------------------------------
remote_login_passwordfile        string         EXCLUSIVE

官方建議在修改密碼前關閉asm實例，測試中未關閉，遠程連接正常。

11g中修改密碼相對簡單：
single instance：

$ export ORACLE_SID=+ASM

$ asmcmd

ASMCMD> passwd sys
Enter old password (optional): 
Enter new password: ******

Cluster environment

ASMCMD> orapwusr --modify --password sys

Enter password: 
ASMCMD> exit

參考自：
How To Change ASM SYS PASSWORD ? (文檔 ID 452076.1)
How to connect to ASM instance from a remote client (Oracle Net) (文檔 ID 340277.1)

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