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DataGuard 物理备库,正常为 mount 状态,如果想要进行查询,需要转为 ADG,即 read only 状态!
在开启为 read only 之前,需要给备库添加 n+1
组的 standby redo LOG!
查询主库的 redolog F1a;
set line222
set pagesize1000
col member for a60
select t2.thread#,t1.group#,t1.member,t2.bytes/1024/1024 From v$logfile t1,v$log t2 where t1.group#=t2.group# order by 1,2;
THREAD# GROUP# MEMBER T2.BYTES/1024/1024
---------- ---------- ------------------------------------------------------------ ------------------
1 1 +DATA/mesdb/onlinelog/group_1.257.1034181431 200
1 2 +DATA/mesdb/onlinelog/group_2.258.1034181431 200
1 5 +DATA/mesdb/onlinelog/group_5.268.1034182623 200
1 7 +DATA/mesdb/onlinelog/group_7.270.1034182623 200
1 9 +DATA/mesdb/onlinelog/group_9.272.1034182623 200
1 11 +DATA/mesdb/onlinelog/group_11.274.1034182623 200
1 13 +DATA/mesdb/onlinelog/group_13.276.1034182625 200
2 3 +DATA/mesdb/onlinelog/group_3.265.1034182261 200
2 4 +DATA/mesdb/onlinelog/group_4.266.1034182263 200
2 6 +DATA/mesdb/onlinelog/group_6.269.1034182623 200
2 8 +DATA/mesdb/onlinelog/group_8.271.1034182623 200
2 10 +DATA/mesdb/onlinelog/group_10.273.1034182623 200
2 12 +DATA/mesdb/onlinelog/group_12.275.1034182623 200
2 14 +DATA/mesdb/onlinelog/group_14.277.1034182627 200
14 rows selected.
需要注意:
- stanby log日志大小至少要和redo log日志一样大小,不能小于
- stanby log数量: standby logfile=(1+logfile组数)=(1+2)=3组,每个thread需要加3组standby logfile.
- thread要与redo log保持一致,如果是rac,需要增加多个thread对应的standby log
关闭备库同步进程:
alter database recover managed standby database cancel;
备库添加standby redo log:
ALTER DATABASE ADD STANDBY LOGFILE thread 1
group 21 ('/data/MESSTB/onlinelog/standby_group_21') SIZE 200M,
group 22 ('/data/MESSTB/onlinelog/standby_group_22') SIZE 200M,
group 23 ('/data/MESSTB/onlinelog/standby_group_23') SIZE 200M,
group 24 ('/data/MESSTB/onlinelog/standby_group_24') SIZE 200M,
group 25 ('/data/MESSTB/onlinelog/standby_group_25') SIZE 200M,
group 26 ('/data/MESSTB/onlinelog/standby_group_26') SIZE 200M,
group 27 ('/data/MESSTB/onlinelog/standby_group_27') SIZE 200M,
group 28 ('/data/MESSTB/onlinelog/standby_group_28') SIZE 200M;
ALTER DATABASE ADD STANDBY LOGFILE thread 2
group 31 ('/data/MESSTB/onlinelog/standby_group_31') SIZE 200M,
group 32 ('/data/MESSTB/onlinelog/standby_group_32') SIZE 200M,
group 33 ('/data/MESSTB/onlinelog/standby_group_33') SIZE 200M,
group 34 ('/data/MESSTB/onlinelog/standby_group_34') SIZE 200M,
group 35 ('/data/MESSTB/onlinelog/standby_group_35') SIZE 200M,
group 36 ('/data/MESSTB/onlinelog/standby_group_36') SIZE 200M,
group 37 ('/data/MESSTB/onlinelog/standby_group_37') SIZE 200M,
group 38 ('/data/MESSTB/onlinelog/standby_group_38') SIZE 200M;
重启开启备库同步进程:
alter database oPEn read only;
alter database recover managed standby database using current logfile disconnect from session;
检查日志同步情况:
set line222
set pagesize1000
col member for a60
select t2.thread#,t1.group#,t1.member,t2.statUS,t2.ArchIVED,t2.bytes/1024/1024 from v$logfile t1,v$standby_log t2 where t1.group#=t2.group# order by 1,2;
select PRocess,group#,thread#,sequence# from v$managed_standby;
select database_role,open_mode from v$database;
至此,ADG 已经转换完成!
本次分享到此结束啦~
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