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最近一直在搭建ORACLE 12C ADG ，其中包括单机到单机的ADG, RAC到RAC的ADG，还有RAC到单机的ADG，遇到不少小问题，在此做一下记录。
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Oracle 12c R1 RAC 修改启动方式
$srvctl modify database -d orcldg -s nomount orcldg为数据库名
$srvctl modify database -d orcldg -s mount
$srvctl modify database -d orcldg -s open
置完DATAGUARD之后，默认是mount，但是我们要求自动启动成ADG模式，这里就需要做一个小小的改动。
1.查看启动方式
$srvctl config database -d orcldg
Database unique name: orcldg
Database name:
Oracle home: /u01/app/oracle/product/12.1.0/dbhome_1
Oracle user: oracle
Spfile: +DATADG/orcldg/spfileorcldg.ora
Password file: +DATADG/orcldg/PASSWORD/pworcldg
Domain:
Start options: mount
Stop options: immediate
Database role: PHYSICAL_STANDBY
Management policy: AUTOMATIC
Disk Groups: DATADG
Services:
OSDBA group:
OSOPER group:
Database instance: orcldg
2.修改启动方式
$srvctl modify database -db orcldg -startoption open
3.在此验证启动方式
Database unique name: orcldg
Database name:
Oracle home: /u01/app/oracle/product/12.1.0/dbhome_1
Oracle user: oracle
Spfile: +DATADG/orcldg/spfileorcldg.ora
Password file: +DATADG/orcldg/PASSWORD/pworcldg
Domain:
Start options: open
Stop options: immediate
Database role: PHYSICAL_STANDBY
Management policy: AUTOMATIC
Disk Groups: DATADG
Services:
OSDBA group:
OSOPER group:
Database instance: orcldg
4.启动数据库，查看open_mode 已经启动为ADG模式了
SQL> startup
ORACLE instance started.
Total System Global Area 1174405120 bytes
Fixed Size 2923680 bytes
Variable Size 436208480 bytes
Database Buffers 721420288 bytes
Redo Buffers 13852672 bytes
Database mounted.
Database opened.
SQL> select open_mode from v$database;
OPEN_MODE
--------------------
READ ONLY WITH APPLY
SQL>