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主頁 > 知識庫 > ORA-00349|激活 ADG 備庫時(shí)遇到的問題及處理方法

ORA-00349|激活 ADG 備庫時(shí)遇到的問題及處理方法

近日有一套實(shí)時(shí)同步的 ASM 管理的單機(jī) 11204 ADG 備庫，由于業(yè)務(wù)需要，想要脫離主庫的約束，想激活拉成讀寫庫直接升級成 ASM 管理的 19C，閃回快照模式無法滿足要求，只能 ALTER DATABASE ACTIVATE STANDBY DATABASE 強(qiáng)制切成可讀寫的主庫。說干就干，先將其切成主庫，升級過程等下次在一起討論。

--主庫
--主庫設(shè)置為 defer, 取消備庫日志應(yīng)用，關(guān)庫啟動(dòng)到 mount 狀態(tài)進(jìn)行。
show parameter log_archive_dest_state_2
alter system set log_archive_dest_state_2=defer scope=both sid='*';
 
--備庫
alter database recover managed standby database cancel;
shu immediate
startup mount
 
--強(qiáng)制拉成主庫，很遺憾報(bào)錯(cuò) ORA-00349
SQL> ALTER DATABASE ACTIVATE STANDBY DATABASE;
ALTER DATABASE ACTIVATE STANDBY DATABASE
*
ERROR at line 1:
ORA-00349: failure obtaining block size for '+JIEKE_DATA'
ORA-15001: diskgroup "JIEKE_DATA" does not exist or is not mounted
ORA-15001: diskgroup "JIEKE_DATA" does not exist or is not mounted

使用 ACTIVATE 命令想強(qiáng)制拉成主庫，很遺憾如下圖報(bào)錯(cuò) ORA-00349。alert 日志中發(fā)現(xiàn)有很多清理 redo log 的報(bào)錯(cuò)，“ORA-00313: open failed…”無法打開日志組 5、6、23，于是查看日志組成員確實(shí)發(fā)現(xiàn) redolog 創(chuàng)建的有問題，member 成員顯示的為不存在的磁盤組 “+JIEKE_DATA” 而不是具體路徑，真是存在的磁盤組“+JIEKER_DATA”。這就是問題所在，redolog 創(chuàng)建錯(cuò)誤，切成主庫時(shí) redolog 又是必須的，故報(bào)錯(cuò)了，那么現(xiàn)在就是將這個(gè)錯(cuò)誤的 redolog 重建，問題就會(huì)得到解決。但實(shí)際上不是這樣的，折騰了好久也沒解決，繼續(xù)往下看。

GROUP# Member
---------- ---------------------------------------------------------------------------------------------------
  5 +JIEKE_DATA
  5 +JIEKE_DATA
  6 +JIEKE_DATA
  6 +JIEKE_DATA
 23 +JIEKE_DATA
 23 +JIEKE_DATA
 11 +JIEKER_DATA/jiekexu/onlinelog/group_11.1621.1065127343
 11 +JIEKER_ARCH/jiekexu/onlinelog/group_11.389.1065127355
 12 +JIEKER_DATA/jiekexu/onlinelog/group_12.1620.1065127363
 12 +JIEKER_ARCH/jiekexu/onlinelog/group_12.395.1065127371
 13 +JIEKER_DATA/jiekexu/onlinelog/group_13.1619.1065127381
 
 SELECT to_char(f.group#) groupno, to_char(l.thread#) thread, f.member member, f.type redo_file_type, l.status group_status, f.status member_status, l.bytes/1024/1024 bytes, l.archived archived 
FROM v$logfile f, v$log l WHERE f.group# = l.grSQL> oup# ORDER BY f.group#, f.member;
SQL> SQL> SQL> SQL> SQL> SQL> SQL> SQL> SQL> 2 
Group Thread Member  Redo Type Group Status Member Status Size(M) Archived
------ ------ -------------------- ---------- ------------ --------------- -------- ----------
5 1 +JIEKE_DATA  ONLINE CLEARING INVALID  4,096 YES
 1 +JIEKE_DATA  ONLINE CLEARING INVALID  4,096 YES
6 2 +JIEKE_DATA  ONLINE CLEARING INVALID  4,096 YES
 2 +JIEKE_DATA  ONLINE CLEARING INVALID  4,096 YES
23 1 +JIEKE_DATA  ONLINE CLEARING_CUR INVALID  4,096 YES
      RENT
 
 1 +JIEKE_DATA  ONLINE CLEARING_CUR INVALID  4,096 YES
      RENT
 
27 2 +JIEKER_DATA/jiekexu/ ONLINE UNUSED    4,096 YES
  onlinelog/group_27.1
  741.1065129955
 
28 2 +JIEKER_DATA/jiekexu/ ONLINE UNUSED    4,096 YES
  onlinelog/group_28.1
  742.1065129973

alert 日志如下：

Errors in file /app/oracle/diag/rdbms/jiekexu/jiekexu/trace/jiekexu_ora_30872.trc:
ORA-00313: open failed for members of log group 5 of thread 1
Clearing online redo logfile 5 +JIEKE_DATA
Clearing online log 5 of thread 1 sequence number 4751
Errors in file /app/oracle/diag/rdbms/jiekexu/jiekexu/trace/jiekexu_ora_30872.trc:
ORA-00313: open failed for members of log group 5 of thread 1
Errors in file /app/oracle/diag/rdbms/jiekexu/jiekexu/trace/jiekexu_ora_30872.trc:
ORA-00313: open failed for members of log group 5 of thread 1
Clearing online redo logfile 5 complete
Errors in file /app/oracle/diag/rdbms/jiekexu/jiekexu/trace/jiekexu_ora_30872.trc:
ORA-00313: open failed for members of log group 6 of thread 2
Clearing online redo logfile 6 +JIEKE_DATA
Clearing online log 6 of thread 2 sequence number 2592
Errors in file /app/oracle/diag/rdbms/jiekexu/jiekexu/trace/jiekexu_ora_30872.trc:
ORA-00313: open failed for members of log group 6 of thread 2
Errors in file /app/oracle/diag/rdbms/jiekexu/jiekexu/trace/jiekexu_ora_30872.trc:
ORA-00313: open failed for members of log group 6 of thread 2
Clearing online redo logfile 6 complete
Errors in file /app/oracle/diag/rdbms/jiekexu/jiekexu/trace/jiekexu_ora_30872.trc:
ORA-00313: open failed for members of log group 23 of thread 1
Clearing online redo logfile 23 +JIEKE_DATA
Clearing online log 23 of thread 1 sequence number 4752
Errors in file /app/oracle/diag/rdbms/jiekexu/jiekexu/trace/jiekexu_ora_30872.trc:
ORA-00313: open failed for members of log group 23 of thread 1
Errors in file /app/oracle/diag/rdbms/jiekexu/jiekexu/trace/jiekexu_ora_30872.trc:
ORA-00313: open failed for members of log group 23 of thread 1
Clearing online redo logfile 23 complete
Resetting resetlogs activation ID 2008461997 (0x77b6b2ad)
Errors in file /app/oracle/diag/rdbms/jiekexu/jiekexu/trace/jiekexu_ora_30872.trc:
ORA-00313: open failed for members of log group 5 of thread 1
Errors in file /app/oracle/diag/rdbms/jiekexu/jiekexu/trace/jiekexu_ora_30872.trc:
ORA-00313: open failed for members of log group 5 of thread 1
ORA-349 signalled during: ALTER DATABASE ACTIVATE PHYSICAL STANDBY DATABASE...
Tue Mar 02 22:42:30 2021
alter database drop logfile group 23
ORA-1623 signalled during: alter database drop logfile group 23...
Tue Mar 02 22:45:07 2021
RFS[7]: Assigned to RFS process 10180
RFS[7]: Opened log for thread 2 sequence 2592 dbid 1797812601 branch 1063804222
Archived Log entry 1100 added for thread 2 sequence 2592 rlc 1063804222 ID 0x77b6b2ad dest 2:
Tue Mar 02 22:45:08 2021
RFS[8]: Assigned to RFS process 10277
RFS[8]: Selected log 17 for thread 2 sequence 2593 dbid 1797812601 branch 1063804222
Tue Mar 02 22:45:08 2021
Primary database is in MAXIMUM PERFORMANCE mode

重建備庫 redolog

那么，這里將上演的是重建備庫 redolog 的相關(guān)操作步驟。

SQL> alter database drop logfile group 27;
alter database drop logfile group 27
*
ERROR at line 1:
ORA-01156: recovery or flashback in progress may need access to files
--由于開啟了日志應(yīng)用進(jìn)程，直接刪除會(huì)報(bào)錯(cuò)，故需要停止日志應(yīng)用，修改參數(shù) standby_file_management 為手動(dòng)。
SQL> alter database recover managed standby database cancel;
 
Database altered.
SQL> alter system set standby_file_management='manual' scope=both sid='*';
 
Database altered.
SQL> show parameter standby_file_management
 
NAME     TYPE   VALUE
------------------------------------ ---------------------- ------------------------------
standby_file_management  string   manual
SQL> alter database drop logfile group 27;
 
Database altered.
 
--由于日志組不能少于 2 個(gè)，故 日志組 28 不不能夠刪除。
SQL> alter database drop logfile group 28;
alter database drop logfile group 28
*
ERROR at line 1:
ORA-01567: dropping log 28 would leave less than 2 log files for instance JIEKEXU2 (thread 2)
ORA-00312: online log 28 thread 2: '+JIEKER_DATA/jiekexu/onlinelog/group_28.1742.1065129973'

下面則通過繼續(xù)應(yīng)用日志、重啟、主庫切日志、重命名等各種手段繼續(xù)嘗試刪除這三個(gè)有問題的日志組。

--重啟備庫刪除日志組 6、23，由于是當(dāng)前日志組無法刪除，慶幸日志組 5 成功刪除了。
SQL> alter database drop logfile group 6;
alter database drop logfile group 6
*
ERROR at line 1:
ORA-01623: log 6 is current log for instance JIEKEXU2 (thread 2) - cannot drop
ORA-00312: online log 6 thread 2: '+JIEKE_DATA'
ORA-00312: online log 6 thread 2: '+JIEKE_DATA'
 
SQL> alter database drop logfile group 5;
 
Database altered.
 
SQL> alter database drop logfile group 23;
alter database drop logfile group 23
*
ERROR at line 1:
ORA-01623: log 23 is current log for instance jiekexu (thread 1) - cannot drop
ORA-00312: online log 23 thread 1: '+JIEKE_DATA'
ORA-00312: online log 23 thread 1: '+JIEKE_DATA'
 
--只剩兩組日志組也是當(dāng)前日志組，則當(dāng)前日志組無法刪除，嘗試進(jìn)行 rename 操作，但也是無效或者缺失命令。
 
SQL> alter database rename '+JIEKE_DATA' to '+JIEKER_DATA';
alter database rename '+JIEKE_DATA' to '+JIEKER_DATA'
   *
ERROR at line 1:
ORA-02231: missing or invalid option to ALTER DATABASE
 
SQL> alter database rename '+JIEKE_DATA' to '+JIEKER_DATA/jiekexu/onlinelog/group_6.dbf';
alter database rename '+JIEKE_DATA' to '+JIEKER_DATA/jiekexu/onlinelog/group_6.dbf'
   *
ERROR at line 1:
ORA-02231: missing or invalid option to ALTER DATABASE
 
--當(dāng)然繼續(xù)激活為主庫肯定也是報(bào)錯(cuò)。那就繼續(xù)開啟日志同步模式，先保持備庫同步吧。
SQL> ALTER DATABASE ACTIVATE STANDBY DATABASE;
ALTER DATABASE ACTIVATE STANDBY DATABASE
*
ERROR at line 1:
ORA-00349: failure obtaining block size for '+JIEKE_DATA'
ORA-15001: diskgroup "JIEKE_DATA" does not exist or is not mounted
ORA-15001: diskgroup "JIEKE_DATA" does not exist or is not mounted
 
SQL> alter database recover managed standby database using current logfile disconnect from session;
 
Database altered.

重建備庫控制文件解決

第二日早晨，睡醒之后頭腦清晰想到備庫既然無法刪除，那主庫肯定是可以刪除的。通過主庫刪除日志組 6、23 之后，再重建一個(gè)備庫的控制文件就可以解決。這樣也很簡單，主庫刪除備庫有問題的兩組日志組后使用 rman 備份一個(gè)備庫的控制文件，然后 scp 到備庫，備庫重啟到 nomount 恢復(fù)控制文件，啟動(dòng)到 mount 就好了。

--主庫：
SQL> alter database drop logfile group 6;
Database altered.
SQL> alter database drop logfile group 23;
Database altered.
 
rman target /
RMAN> backup current controlfile for standby format '/home/oracle/backup20210303%d_%I_%s_%p.ctl';
scp /home/oracle/backup20210303%d_%I_%s_%p.ctl jiekeadg:/home/oracle/
 
--備庫
SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE CANCEL;
Database altered.
 
SQL> shu immediate 
ORA-01109: database not open
Database dismounted.
ORACLE instance shut down.
SQL> startup nomount 
ORACLE instance started.
Total System Global Area 1.0689E+11 bytes
Fixed Size   2265864 bytes
Variable Size  4.2144E+10 bytes
Database Buffers  6.4425E+10 bytes
Redo Buffers  323678208 bytes
SQL> exit
 
jiekeadg:/home/oracle(jiekexu)>rman target /
Recovery Manager: Release 11.2.0.4.0 - Production on Wed Mar 3 10:07:34 2021
Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.
connected to target database: JIEKEXU (not mounted)
RMAN> restore standby controlfile from '/home/oracle/backup20210303JIEKEXU_1797812601_106_1.ctl';
Starting restore at 2021-03-03 10:08:03
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=3009 device type=DISK
channel ORA_DISK_1: restoring control file
channel ORA_DISK_1: restore complete, elapsed time: 00:00:01
output file name=+JIEKER_DATA/jiekexu/controlfile/current.1739.1065125909
output file name=+JIEKER_ARCH/jiekexu/controlfile/current.323.1065125911
Finished restore at 2021-03-03 10:08:04
RMAN> sql'alter database mount';
sql statement: alter database mount
released channel: ORA_DISK_1
RMAN> exit
 
-- SQLPLUS 里應(yīng)用 MRP0 進(jìn)程同步數(shù)據(jù)。
jiekeadg:/home/oracle(jiekexu)>sqlplus / as sysdba
SQL> alter database recover managed standby database using current logfile disconnect from session;
 
Database altered.
SQL> /
 
NAME  VALUE  UNIT    TIME_COMPUTED
------------- -------------------- ------------------------------ ------------------------------
transport lag +00 00:00:00  day(2) to second(0) interval 03/03/2021 10:19:08
apply lag +00 00:00:00  day(2) to second(0) interval 03/03/2021 10:19:08

重建控制文件后恢復(fù)的備庫中就沒有了錯(cuò)誤的磁盤組，但這樣時(shí)間長一些則備庫日志應(yīng)用會(huì)延遲，因?yàn)?standby_log 日志狀態(tài)全部為 UNASSIGNED 的。需要重建備庫 standby redolog 日志組后它的狀態(tài)才會(huì)變成 ACTIVE。
取消日志應(yīng)用，修改參數(shù)為 manual 刪除原有日志組，重建日志組改回參數(shù)應(yīng)用日志同步進(jìn)程即可。

SELECT to_char(f.group#) groupno, to_char(l.thread#) thread, f.member member, f.type redo_file_type, l.status group_status, f.status member_status, l.bytes/1024/1024 bytes, l.archived archived 
FROM v$logfile f, v$log l WHERE f.group# = l.group# ORDER BY f.group#, f.member;SQL> 
SQL> SQL> SQL> SQL> SQL> SQL> SQL> SQL> SQL> 2 
Group Thread Member  Redo Type Group Status Member Status Size(M) Archived
------ ------ -------------------- ---------- ------------ --------------- -------- ----------
1 1 +JIEKE_DATA  ONLINE CLEARING INVALID  4,096 YES
 1 +JIEKE_DATA  ONLINE CLEARING INVALID  4,096 YES
2 1 +JIEKE_DATA  ONLINE CLEARING INVALID  4,096 YES
 1 +JIEKE_DATA  ONLINE CLEARING INVALID  4,096 YES
3 1 +JIEKE_DATA  ONLINE CLEARING INVALID  4,096 YES
 1 +JIEKE_DATA  ONLINE CLEARING INVALID  4,096 YES
4 1 +JIEKE_DATA  ONLINE CURRENT INVALID  4,096 YES
 1 +JIEKE_DATA  ONLINE CURRENT INVALID  4,096 YES
5 1 +JIEKE_DATA  ONLINE CLEARING INVALID  4,096 YES
 1 +JIEKE_DATA  ONLINE CLEARING INVALID  4,096 YES
7 2 +JIEKE_DATA  ONLINE CLEARING INVALID  4,096 YES
 2 +JIEKE_DATA  ONLINE CLEARING INVALID  4,096 YES
8 2 +JIEKE_DATA  ONLINE CLEARING INVALID  4,096 YES
 2 +JIEKE_DATA  ONLINE CLEARING INVALID  4,096 YES
9 2 +JIEKE_DATA  ONLINE CLEARING INVALID  4,096 YES
 2 +JIEKE_DATA  ONLINE CLEARING INVALID  4,096 YES
10 2 +JIEKE_DATA  ONLINE CURRENT INVALID  4,096 YES
 2 +JIEKE_DATA  ONLINE CURRENT INVALID  4,096 YES
24 2 +JIEKE_DATA  ONLINE CLEARING INVALID  4,096 YES
 2 +JIEKE_DATA  ONLINE CLEARING INVALID  4,096 YES
 
SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE CANCEL;
Database altered.
SQL> show parameter standby_file_management
NAME     TYPE   VALUE
------------------------------------ ---------------------- ------------------------------standby_file_management  string   manual
SQL> 
SQL> select inst_id,GROUP#,THREAD#,SEQUENCE#,USED,ARCHIVED,STATUS from gv$standby_log; 
 INST_ID GROUP# THREAD# SEQUENCE# USED Archived STATUS
---------- ---------- ---------- ---------- ---------- ---------- --------------------
  1  11  1  0  0 YES UNASSIGNED
  1  12  1  0  0 YES UNASSIGNED
  1  13  1  0  0 YES UNASSIGNED
  1  14  1  0  0 YES UNASSIGNED
  1  15  1  0  0 YES UNASSIGNED
 
alter database drop logfile group 11;
alter database drop logfile group 12; 
alter database drop logfile group 13;
alter database drop logfile group 14;
alter database drop logfile group 15;
ALTER DATABASE ADD standby LOGFILE THREAD 1 ('+JIEKER_DATA','+JIEKER_ARCH') SIZE 4G;
ALTER DATABASE ADD standby LOGFILE THREAD 1 ('+JIEKER_DATA','+JIEKER_ARCH') SIZE 4G;
ALTER DATABASE ADD standby LOGFILE THREAD 1 ('+JIEKER_DATA','+JIEKER_ARCH') SIZE 4G;
ALTER DATABASE ADD standby LOGFILE THREAD 1 ('+JIEKER_DATA','+JIEKER_ARCH') SIZE 4G;
ALTER DATABASE ADD standby LOGFILE THREAD 1 ('+JIEKER_DATA','+JIEKER_ARCH') SIZE 4G;
 
SQL> select inst_id,GROUP#,THREAD#,SEQUENCE#,USED,ARCHIVED,STATUS from gv$standby_log; 
 INST_ID GROUP# THREAD# SEQUENCE# USED Archived STATUS
---------- ---------- ---------- ---------- ---------- ---------- --------------------
  1  6  1 4797 3026358272 YES ACTIVE
  1  11  1  0  0 YES UNASSIGNED
  1  12  1  0  0 YES UNASSIGNED
  1  13  1  0  0 YES UNASSIGNED
  1  14  1  0  0 YES UNASSIGNED
SQL> alter system set standby_file_management='AUTO' scope=both sid='*';
SQL> alter database open;
alter database recover managed standby database using current logfile disconnect from session;
Database altered.

找到最終問題所在

完成重建后，本以為已經(jīng)萬事大吉了，但一開庫應(yīng)用日志卻發(fā)現(xiàn)后臺日志中所有 redolog 日志組都被清理了。這才意識到問題的根源所在，立馬查看了路徑相關(guān)的參數(shù)發(fā)現(xiàn) db_create_online_log_dest 參數(shù)設(shè)置錯(cuò)誤，導(dǎo)致創(chuàng)建出了錯(cuò)誤的磁盤組。

jiekeadg:/home/oracle(jiekexu)>sqlplus / as sysdba 
 
SQL*Plus: Release 11.2.0.4.0 Production on Wed Mar 3 10:52:04 2021
 
Copyright (c) 1982, 2013, Oracle. All rights reserved.
 
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Automatic Storage Management, OLAP, Data Mining
and Real Application Testing options
 
SQL> show parameter db_create_online_log_dest_ 
 
NAME     TYPE VALUE
------------------------------------ ----------- ------------------------------
db_create_online_log_dest_1  string +JIEKE_DATA
db_create_online_log_dest_2  string +JIEKE_DATA
db_create_online_log_dest_3  string
db_create_online_log_dest_4  string
db_create_online_log_dest_5  string
SQL> alter system set db_create_online_log_dest_1='+JIEKER_DATA' scope=spfile;
 
System altered.
 
SQL> alter system set db_create_online_log_dest_2='+JIEKER_DATA' scope=spfile;
 
System altered.

但是現(xiàn)在修改完參數(shù)所有的日志組成員也都出現(xiàn)在錯(cuò)誤的磁盤組了，因?yàn)橛辛?strong>當(dāng)前日志組 4、10 占用了，重建日志組也行不通，故只能再次重建備庫控制文件了。以上主庫備份控制文件傳到備庫恢復(fù)的過程再來一遍即可。

SELECT to_char(f.group#) groupno, to_char(l.thread#) thread, f.member member, f.type redo_file_type, l.status group_status, f.status member_status, l.bytes/1024/1024 bytes, l.archived archived 
FROM v$logfile f, v$log l WHERE f.group# = l.group# ORDER BY f.group#, f.member;SQL> 
SQL> SQL> SQL> SQL> SQL> SQL> SQL> SQL> SQL> 2 
Group Thread Member  Redo Type Group Status Member Status Size(M) Archived
------ ------ -------------------- ---------- ------------ --------------- -------- ----------
1 1 +JIEKE_DATA  ONLINE CLEARING INVALID  4,096 YES
 1 +JIEKE_DATA  ONLINE CLEARING INVALID  4,096 YES
2 1 +JIEKE_DATA  ONLINE CLEARING INVALID  4,096 YES
 1 +JIEKE_DATA  ONLINE CLEARING INVALID  4,096 YES
3 1 +JIEKE_DATA  ONLINE CLEARING INVALID  4,096 YES
 1 +JIEKE_DATA  ONLINE CLEARING INVALID  4,096 YES
4 1 +JIEKE_DATA  ONLINE CURRENT INVALID  4,096 YES
 1 +JIEKE_DATA  ONLINE CURRENT INVALID  4,096 YES
5 1 +JIEKE_DATA  ONLINE CLEARING INVALID  4,096 YES
 1 +JIEKE_DATA  ONLINE CLEARING INVALID  4,096 YES
7 2 +JIEKE_DATA  ONLINE CLEARING INVALID  4,096 YES
 2 +JIEKE_DATA  ONLINE CLEARING INVALID  4,096 YES
8 2 +JIEKE_DATA  ONLINE CLEARING INVALID  4,096 YES
 2 +JIEKE_DATA  ONLINE CLEARING INVALID  4,096 YES
9 2 +JIEKE_DATA  ONLINE CLEARING INVALID  4,096 YES
 2 +JIEKE_DATA  ONLINE CLEARING INVALID  4,096 YES
10 2 +JIEKE_DATA  ONLINE CURRENT INVALID  4,096 YES
 2 +JIEKE_DATA  ONLINE CURRENT INVALID  4,096 YES
24 2 +JIEKE_DATA  ONLINE CLEARING INVALID  4,096 YES
 2 +JIEKE_DATA  ONLINE CLEARING INVALID  4,096 YES
 
20 rows selected.

最終激活備庫

再一次重建后正常恢復(fù)同步，然后關(guān)閉實(shí)例啟動(dòng)到 mount 狀態(tài)，激活 ADG 備庫，重啟驗(yàn)證即可。

SQL> shu immediate 
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> 
SQL> startup mount 
ORACLE instance started.
 
Total System Global Area 1.0689E+11 bytes
Fixed Size   2265864 bytes
Variable Size  4.2144E+10 bytes
Database Buffers  6.4425E+10 bytes
Redo Buffers  323678208 bytes
Database mounted.
SQL> 
SQL> ALTER DATABASE ACTIVATE STANDBY DATABASE;
 
Database altered.
 
SQL> alter database open;
 
Database altered.
 
SQL> select DATABASE_ROLE from v$database;
 
DATABASE_ROLE
--------------------------------
PRIMARY
 
SQL> shu immediate 
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup 
ORACLE instance started.
Total System Global Area 1.0689E+11 bytes
Fixed Size   2265864 bytes
Variable Size  4.2144E+10 bytes
Database Buffers  6.4425E+10 bytes
Redo Buffers  323678208 bytes
Database mounted.
Database opened.
SQL> exit

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