今天合作伙伴需要一个redo切换的情况，因为是RAC环境，需要将网上的语句修改一下，试试。
select b.sequence#,
to_char(b.first_time,'dd-mon-yy hh:mi:ss') start_time,
a.sequence#,
to_char(a.first_time,'dd-mon-yy hh:mi:ss') end_time,
round(((a.first_time-b.first_time)*24)*60,2) minutes
from v$log_history a, v$log_history b
where a.sequence#=b.sequence#+1 and a.thread=1 and b.thread=1
order by a.sequence# desc；
select b.sequence#,
to_char(b.first_time,'dd-mon-yy hh:mi:ss') start_time,
a.sequence#,
to_char(a.first_time,'dd-mon-yy hh:mi:ss') end_time,
round(((a.first_time-b.first_time)*24)*60,2) minutes
from v$log_history a, v$log_history b
where a.sequence#=b.sequence#+1 and a.thread=1 and b.thread=1
order by a.sequence# desc；
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/11946422/viewspace-672532/ ，如需转载，请注明出处，否则将追究法律责任。
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