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 :
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
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