標籤：oracle 11g dataguard維護注意事項
1.檢查primary和standby節點歸檔日誌是否一至
(1).primary節點的歸檔日誌
SQL> archive log list;
Database log mode Archive Mode
Automatic archival Enabled
Archive destination /u01/oradata/tong/archive
Oldest online log sequence 111
Next log sequence to archive 113
Current log sequence 113 --primary和standby節點這個數字一至就可以了
SQL>
(2).standby節點的歸檔日誌
SQL> archive log list;
Database log mode Archive Mode
Automatic archival Enabled
Archive destination /u01/oradata/tong/archive
Oldest online log sequence 112
Next log sequence to archive 0
Current log sequence 113
SQL>
2.檢查primary和stendby兩個節點是否歸檔和開啟閃回
SQL> select log_mode ,force_logging,flashback_on from v$database;
LOG_MODE FOR FLASHBACK_ON
------------ --- ------------------
ARCHIVELOG YES NO
SQL>
3.查看primary和stendby節點監聽是否啟動或正常狀態
[[email protected] ~]$ lsnrctl status
LSNRCTL for Linux: Version 11.2.0.1.0 - Production on 11-NOV-2016 14:39:14
Copyright (c) 1991, 2009, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=192.168.3.55)(PORT=1521)))
STATUS of the LISTENER
------------------------
Alias LISTENER
Version TNSLSNR for Linux: Version 11.2.0.1.0 - Production
Start Date 11-NOV-2016 14:39:04
Uptime 0 days 0 hr. 0 min. 10 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/product/11.2.0.1/db_1/network/admin/listener.ora
Listener Log File /u01/diag/tnslsnr/dg1/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.3.55)(PORT=1521)))
Services Summary...
Service "tong" has 1 instance(s).
Instance "tong", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully
[[email protected] ~]$
4.檢查primary和stendby節點歸檔目錄是否一至(log_archive_dest_1)
SQL> show parameter log_archive_dest_1
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest_1 string LOCATION=/u01/oradata/tong/archive valid_for(all_logfiles,all_roles)
db_unique_name=tong
log_archive_dest_10 string
log_archive_dest_11 string
5.檢查磁碟使用空間(有時由於磁碟空間不夠,閃回恢複區不能寫入檔案)
[[email protected] ~]$ df -TH
Filesystem Type Size Used Avail Use% Mounted on
/dev/sda3 ext3 17G 11G 4.4G 72% /
/dev/sda1 ext3 510M 28M 456M 6% /boot
tmpfs tmpfs 1.1G 520M 523M 50% /dev/shm
[[email protected] ~]$
6.正確開啟dataguard資料庫(先啟動primary節點資料庫,後在standby節點開啟記錄傳送模式)
(1).在primary節點開啟資料庫
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount
ORACLE instance started.
Total System Global Area 830930944 bytes
Fixed Size 2217912 bytes
Variable Size 532678728 bytes
Database Buffers 293601280 bytes
Redo Buffers 2433024 bytes
Database mounted.
SQL> alter database archivelog;
Database altered.
SQL> alter database open;
Database altered.
SQL> select * from dual;
D
-
X
SQL>
(2).在standby節點
SQL> startup mount;
ORACLE instance started.
Total System Global Area 830930944 bytes
Fixed Size 2217912 bytes
Variable Size 490735688 bytes
Database Buffers 335544320 bytes
Redo Buffers 2433024 bytes
Database mounted.
SQL> alter database recover managed standby database disconnect from session;
Database altered.
SQL>
7.正確關閉資料庫(先在syandby斷開複製,然後在primary關閉資料庫)
(1).standby節點
SQL> alter database recover managed standby database cancel;
Database altered.
SQL> shutdown immediate
ORA-01109: database not open
Database dismounted.
ORACLE instance shut down.
SQL>
(2).primary節點
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL>
8.在syandby節點修改資料庫為read only模式
(1).primary節點的資料庫是open狀態
(2).standby節點的資料庫是記錄傳送狀態
SQL> recover managed standby database cancel; --結束記錄傳送狀態
Media recovery complete.
SQL> alter database open read only; --將資料庫的狀態修改為read only
Database altered.
SQL> select * from t;
A
-------------------
1
2
3
4
6
7
8
7 rows selected.
SQL>
9.將standby節點的資料庫由read only修改為記錄傳送狀態
SQL> select status from v$instance;
STATUS
------------
OPEN
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount
ORACLE instance started.
Total System Global Area 830930944 bytes
Fixed Size 2217912 bytes
Variable Size 490735688 bytes
Database Buffers 335544320 bytes
Redo Buffers 2433024 bytes
Database mounted.
SQL> alter database recover managed standby database disconnect from session;
Database altered.
SQL> select status from v$instance;
STATUS
------------
MOUNTED
SQL>
10.查看記錄傳送的資訊
(1).primary節點當前的日誌資訊
SQL> select sequence#,status from v$log;
SEQUENCE# STATUS
---------- ----------------
127 ACTIVE
128 CURRENT
126 ACTIVE
SQL>
(2).standby節點正在傳送的日誌資訊
SQL> SELECT PROCESS, STATUS, THREAD#, SEQUENCE#, BLOCK#, BLOCKS FROM V$MANAGED_STANDBY;
PROCESS STATUS THREAD# SEQUENCE# BLOCK# BLOCKS
--------- ------------ ---------- ---------- ---------- ----------
ARCH CLOSING 1 127 1 6
ARCH CLOSING 1 125 1 271
ARCH CONNECTED 0 0 0 0
ARCH CLOSING 1 126 1 43
RFS IDLE 0 0 0 0
RFS IDLE 0 0 0 0
RFS IDLE 1 128 182 1
RFS IDLE 0 0 0 0
MRP0 WAIT_FOR_LOG 1 128 0 0
9 rows selected.
SQL>
11.檢查standby節點的備庫是否與主庫同步
(1).primary節點查看已經歸檔的日誌
SQL> SELECT ARCHIVED_THREAD#, ARCHIVED_SEQ#, APPLIED_THREAD#, APPLIED_SEQ# FROM V$ARCHIVE_DEST_STATUS;
ARCHIVED_THREAD# ARCHIVED_SEQ# APPLIED_THREAD# APPLIED_SEQ#
---------------- ------------- --------------- ------------
1 127 0 0
1 127 1 124
1 127 0 0
1 127 0 0
1 127 0 0
1 127 0 0
1 127 0 0
1 127 0 0
1 127 0 0
1 127 0 0
1 127 0 0 --表示在127以前的日誌全部歸檔
11 rows selected.
SQL>
(2).standby節點的歸檔日誌資訊
SQL> SELECT ARCHIVED_THREAD#, ARCHIVED_SEQ#, APPLIED_THREAD#, APPLIED_SEQ# FROM V$ARCHIVE_DEST_STATUS;
ARCHIVED_THREAD# ARCHIVED_SEQ# APPLIED_THREAD# APPLIED_SEQ#
---------------- ------------- --------------- ------------
1 127 0 0
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
1 127 1 127
11 rows selected.
SQL>
12.在standby節點查看dataguard的狀態
SQL> select message from v$dataguard_status;
13.primary和standby正常切換狀態
(1).在primary節點查看是否可以切換
SQL> select switchover_status from v$database;
SWITCHOVER_STATUS
--------------------
TO STANDBY
SWITCHOVER_STATUS:TO STANDBY表示可以正常切換.如果SWITCHOVER_STATUS的值為SESSIONS ACTIVE,表示當前有會話處於ACTIVE狀態
如果SWITCHOVER_STATUS的值為TO STANDBY 則:
SQL> alter database commit to switchover to physical standby;
如果SWITCHOVER_STATUS的值為SESSIONS ACTIVE 則:
SQL> alter database commit to switchover to physical standby with session shutdown;
成功運行這個命令後，主庫被修改為備庫
SQL> alter database commit to switchover to physical standby;
Database altered.
SQL> shutdown immediate
ORA-01507: database not mounted
ORACLE instance shut down.
SQL> startup mount
ORACLE instance started.
Total System Global Area 830930944 bytes
Fixed Size 2217912 bytes
Variable Size 532678728 bytes
Database Buffers 293601280 bytes
Redo Buffers 2433024 bytes
Database mounted.
SQL> select switchover_status from v$database;
SWITCHOVER_STATUS
--------------------
TO PRIMARY
SQL>
(2).standby節點
本文出自 “一起走過的日子” 部落格，請務必保留此出處http://tongcheng.blog.51cto.com/6214144/1871815
oracle 11g dataguard維護注意事項
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