oracle 11g dataguard维护注意事项
1.检查primary和standby节点归档日志是否一至
(1).primary节点的归档日志
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节点这个数字一至就可以了
SQL>
(2).standby节点的归档日志
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.检查primary和stendby两个节点是否归档和开启闪回
SQL> select log_mode ,force_logging,flashback_on from v$database;
LOG_MODE FOR FLASHBACK_ON
------------ --- ------------------
ARCHIVELOG YES NO
SQL>
3.查看primary和stendby节点监听是否启动或正常状态
[oracle@dg1 ~]$ 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
[oracle@dg1 ~]$
4.检查primary和stendby节点归档目录是否一至(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.检查磁盘使用空间(有时由于磁盘空间不够,闪回恢复区不能写入文件)
[oracle@dg1 ~]$ 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
[oracle@dg1 ~]$
6.正确打开dataguard数据库(先启动primary节点数据库,后在standby节点开启日志传送模式)
(1).在primary节点打开数据库
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节点
SQL> startup nomount
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
SQL> alter database mount standby database;
Database altered.
SQL> alter database recover managed standby database disconnect from session;
Database altered.
SQL>
7.正确关闭数据库(先在syandby断开复制,然后在primary关闭数据库)
(1).standby节点
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节点
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL>
8.在syandby节点修改数据库为read only模式
(1).primary节点的数据库是open状态
(2).standby节点的数据库是日志传送状态
SQL> recover managed standby database cancel; --结束日志传送状态
Media recovery complete.
SQL> alter database open read only; --将数据库的状态修改为read only
Database altered.
SQL> select * from t;
A
-------------------
1
2
3
4
6
7
8
7 rows selected.
SQL>
9.将standby节点的数据库由read only修改为日志传送状态
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.查看日志传送的信息
(1).primary节点当前的日志信息
SQL> select sequence#,status from v$log;
SEQUENCE# STATUS
---------- ----------------
127 ACTIVE
128 CURRENT
126 ACTIVE
SQL>
(2).standby节点正在传送的日志信息
SQL> SELECT PROCESS, STATUS, THREAD#, SEQUENCE#, BLOCK#, BLOCKS FROM V$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.检查standby节点的备库是否与主库同步
(1).primary节点查看已经归档的日志
SQL> SELECT ARCHIVED_THREAD#, ARCHIVED_SEQ#, APPLIED_THREAD#, APPLIED_SEQ# FROM V$ARCHIVE_DEST_STATUS;
ARCHIVED_THREAD# ARCHIVED_SEQ# APPLIED_THREAD# APPLIED_SEQ#
---------------- ------------- --------------- ------------
1 127 0 0
1 127 1 124
1 127 0 0
1 127 0 0
1 127 0 0
1 127 0 0
1 127 0 0
1 127 0 0
1 127 0 0
1 127 0 0
1 127 0 0 --表示在127以前的日志全部归档
11 rows selected.
SQL>
(2).standby节点的归档日志信息
SQL> SELECT ARCHIVED_THREAD#, ARCHIVED_SEQ#, APPLIED_THREAD#, APPLIED_SEQ# FROM V$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节点查看dataguard的状态
SQL> select message from v$dataguard_status;
13.primary和standby正常切换状态
(1).在primary节点查看是否可以切换
SQL> select switchover_status from v$database;
SWITCHOVER_STATUS
--------------------
TO STANDBY
SWITCHOVER_STATUS:TO STANDBY表示可以正常切换.如果SWITCHOVER_STATUS的值为SESSIONS ACTIVE,表示当前有会话处于ACTIVE状态
如果SWITCHOVER_STATUS的值为TO STANDBY 则:
SQL> alter database commit to switchover to physical standby;
如果SWITCHOVER_STATUS的值为SESSIONS ACTIVE 则:
SQL> alter database commit to switchover to physical standby with session shutdown;
成功运行这个命令后，主库被修改为备库
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节点