Oracle的redo日志切换频率

1、查看redo日志信息

select * from v$log

2、查看日志切换频率

select b.SEQUENCE#,
       b.FIRST_TIME,
       a.SEQUENCE#,
       a.FIRST_TIME,
       round(((a.FIRST_TIME-b.FIRST_TIME)*24)*60,2)
from v$log_history a, v$log_history b
where a.SEQUENCE#=b.SEQUENCE#+1
  and b.THREAD#=1
order by a.SEQUENCE# desc;

或者

select sequence#,
       first_time,
       nexttime,
       round(((first_time-nexttime)*24)*60,2) diff
from (
    select sequence#,
           first_time,
           lag(first_time) over(order by sequence#) nexttime
    from v$log_history where thread#=1
) order by sequence# desc;

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