oracle rac实例切换,RAC+单实例DG的切换
RAC+單實例DG的切換
RAC+單實例DG的搭建過程
之前切換不成功，和參數設置有關。注意的參數是sid=* 之類的，剛搭建好的環境
racdbdg是單實例的，是備庫，rac節點是主庫。
搭建完畢，切換了一次，剛好主庫是單實例的racdbdg，rac節點是備庫了。
進行后續的切換
--------------------------------
primary ：racdbdg? 單實例
SYS@racdbdg>select database_role,switchover_status from v$database;
DATABASE_ROLE
SWITCHOVER_STATUS
---------------- --------------------
PRIMARY
TO STANDBY
SYS@racdbdg>
Standby ： 是RAC節點
SYS@racdb2>select database_role,switchover_status from v$database;
DATABASE_ROLE
SWITCHOVER_STATUS
---------------- --------------------
PHYSICAL STANDBY NOT ALLOWED
SYS@racdb1>select database_role,switchover_status from v$database;
DATABASE_ROLE
SWITCHOVER_STATUS
---------------- --------------------
PHYSICAL STANDBY NOT ALLOWED
或者這樣查詢
SYS@racdb2>select inst_id,database_role,switchover_status from gv$database;
INST_ID DATABASE_ROLE? ? SWITCHOVER_STATUS
---------- ---------------- --------------------
2 PHYSICAL STANDBY NOT ALLOWED
1 PHYSICAL STANDBY NOT ALLOWED
--------開始切換
查看主庫的狀態? 在主機 racdbdg上查看 。 是to standby? ,可以切換
SYS@racdbdg>select database_role,switchover_status from v$database;
DATABASE_ROLE
SWITCHOVER_STATUS
---------------- --------------------
PRIMARY
TO STANDBY
SYS@racdbdg>
-- 將主庫切換到備庫狀態
alter database commit to switchover to physical standby with session shutdown;
SYS@racdbdg>alter database commit to switchover to physical standby with session shutdown;
Database altered.
將新的備庫啟動到mount狀態，這個時候新的備庫是關閉狀態，啟動后，狀態是備庫
SYS@racdbdg>archive log list
ORA-01012: not logged on
SYS@racdbdg>conn / as sysdba
Connected to an idle instance.
SYS@racdbdg>startup mount
ORACLE instance started.
Total System Global Area 1235959808 bytes
Fixed Size
2252784 bytes
Variable Size
922746896 bytes
Database Buffers
301989888 bytes
Redo Buffers
8970240 bytes
Database mounted.
SYS@racdbdg>
SYS@racdbdg>select database_role from v$database;
DATABASE_ROLE
----------------
PHYSICAL STANDBY
SYS@racdbdg>
-- 將原備庫切換為主庫。在rac 任意一個節點上執行
-- 查看rac節點的狀態，是可以切換的
SYS@racdb1>select database_role,switchover_status from v$database;
DATABASE_ROLE
SWITCHOVER_STATUS
---------------- --------------------
PHYSICAL STANDBY TO PRIMARY
SYS@racdb2>select inst_id,database_role,switchover_status from gv$database;
INST_ID DATABASE_ROLE? ? SWITCHOVER_STATUS
---------- ---------------- --------------------
1 PHYSICAL STANDBY SESSIONS ACTIVE
2 PHYSICAL STANDBY SESSIONS ACTIVE
SYS@racdb2>select database_role,switchover_status from v$database;
DATABASE_ROLE
SWITCHOVER_STATUS
---------------- --------------------
PHYSICAL STANDBY TO PRIMARY
SYS@racdb2>
-- 進行切換，在任何一個節點執行。其中另一個節點，會自動切換為mount狀態
--在節點2上執行：
SYS@racdb2>alter database commit to switchover to primary with session shutdown ;
Database altered.
SYS@racdb2>select switchover_status ,open_mode,database_role from v$database;
SWITCHOVER_STATUS? ? OPEN_MODE
DATABASE_ROLE
-------------------- -------------------- ----------------
NOT ALLOWED
MOUNTED
PRIMARY
SYS@racdb2>alter database open;
Database altered.
SYS@racdb2>
--另一個節點狀態
SYS@racdb1>archive log list
ORA-03135: connection lost contact
SYS@racdb1>conn / as sysdba
Connected.
SYS@racdb1>
-- 這個時候，主庫是rac。備庫是單實例的racdbdg了? 在主庫上插入數據，備庫查詢
SYS@racdb2>select count(*) from t;
COUNT(*)
----------
6
SYS@racdb2>insert into t values(7);
1 row created.
SYS@racdb2>commit;
Commit complete.
SYS@racdbdg>select * from t;
ID
----------
1
2
3
4
5
6
7
7 rows selected.
------- 再切換一次，主備切換
現在的主庫是雙節點的rac， 備庫是單實例的racdbdg 。再切換一次，把主庫切換成單節點，備庫切換成rac
SYS@racdb1>select database_role,switchover_status from v$database;
DATABASE_ROLE
SWITCHOVER_STATUS
---------------- --------------------
PRIMARY
TO STANDBY
SYS@racdb1>alter database commit to switchover to physical standby with session shutdown;
Database altered.
SYS@racdb1>
切換為備庫后，原來的雙節點的主庫變成備庫，兩個節點都被關閉。需要mount
SYS@racdb1>select open_mode ,database_role from v$database;
select open_mode ,database_role from v$database
*
ERROR at line 1:
ORA-01034: ORACLE not available
Process ID: 9039
Session ID: 32 Serial number: 19
SYS@racdb1>conn / as sysdba
Connected to an idle instance.
SYS@racdb1>startup mount;
ORACLE instance started.
Total System Global Area 1235959808 bytes
Fixed Size
2252784 bytes
Variable Size
1090519056 bytes
Database Buffers
134217728 bytes
Redo Buffers
8970240 bytes
Database mounted.
SYS@racdb1>select open_mode ,database_role from v$database;
OPEN_MODE
DATABASE_ROLE
-------------------- ----------------
MOUNTED
PHYSICAL STANDBY
SYS@racdb1>
-- 切換單實例的備庫為主庫：
SYS@racdbdg>select database_role,switchover_status from v$database;
DATABASE_ROLE
SWITCHOVER_STATUS
---------------- --------------------
PHYSICAL STANDBY TO PRIMARY
SYS@racdbdg>
SYS@racdbdg>select database_role,switchover_status from v$database;
DATABASE_ROLE
SWITCHOVER_STATUS
---------------- --------------------
PHYSICAL STANDBY TO PRIMARY
SYS@racdbdg>alter database commit to switchover to primary with session shutdown ;
Database altered.
Database altered.
SYS@racdbdg>conn / as sysdba
Connected.
SYS@racdbdg>select database_role,switchover_status from v$database;
DATABASE_ROLE
SWITCHOVER_STATUS
---------------- --------------------
PRIMARY
NOT ALLOWED
SYS@racdbdg>alter database open;
Database altered.
SYS@racdbdg>
--- 驗證 主庫插入數據
SYS@racdbdg>select count(*) from t;
COUNT(*)
----------
8
SYS@racdbdg>insert into t values(9);
1 row created.
SYS@racdbdg>commit;
Commit complete.
SYS@racdbdg>
-- 備庫查詢
SYS@racdb2>archive log list
Database log mode
Archive Mode
Automatic archival
Enabled
Archive destination
+FRA
Oldest online log sequence? ? ?0
Next log sequence to archive? ?0
Current log sequence
0
SYS@racdb2>archive log list
Database log mode
Archive Mode
Automatic archival
Enabled
Archive destination
+FRA
Oldest online log sequence? ? ?0
Next log sequence to archive? ?0
Current log sequence
0
SYS@racdb2>select count(*) from t;
COUNT(*)
----------
9
SYS@racdb2>
SYS@racdb1>archive log list
Database log mode
Archive Mode
Automatic archival
Enabled
Archive destination
+FRA
Oldest online log sequence? ? ?23
Next log sequence to archive? ?0
Current log sequence
23
SYS@racdb1>
SYS@racdbdg>archive log list
Database log mode
Archive Mode
Automatic archival
Enabled
Archive destination
/u01/archivelog
Oldest online log sequence? ? ?22
Next log sequence to archive? ?23
Current log sequence
23
SYS@racdbdg>
從上面可以看到，切換成功了 。
從alert log中看到的一些信息。說明，在搭建的時候，要考慮sid
Archived Log entry 91 added for thread 2 sequence 16 ID 0x396d1acf dest 1:
Fri Jan 19 15:44:15 2018
ALTER SYSTEM SET log_archive_dest_state_2='ENABLE' SCOPE=MEMORY SID='*';
Fri Jan 19 15:45:43 2018
Thread 1 cannot allocate new log, sequence 23
Checkpoint not complete
Current log# 1 seq# 22 mem# 0: /u01/app/oracle/oradata/racdbdg/group_1.257.965769287
******************************************************************
LGWR: Setting 'active' archival for destination LOG_ARCHIVE_DEST_2
******************************************************************
LGWR: Standby redo logfile selected for thread 1 sequence 23 for destination LOG_ARCHIVE_DEST_2
Thread 1 advanced to log sequence 23 (LGWR switch)
Current log# 2 seq# 23 mem# 0: /u01/app/oracle/oradata/racdbdg/group_2.258.965769287
Fri Jan 19 15:45:45 2018
Archived Log entry 94 added for thread 1 sequence 22 ID 0x396d1acf dest 1:
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