查看Oracle的redo日志切换频率
2013-08-05 13:28
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两个sql,原理是一样的,第二个用到了统计函数。
时间单位:分钟
方法一、
select * from v$log a where
a.THREAD# = 1 ;
set pagesize 49999
set wrap off?
set line 200
select b.SEQUENCE#,b.FIRST_TIME,a.SEQUENCE#,a.FIRST_TIME,round(((a.FIRST_TIME-b.FIRST_TIME)*24)*60,2) from v$log_history a, v$log_history b
where a.SEQUENCE#=b.SEQUENCE#+1 and b.THREAD#=1 order by a.SEQUENCE# desc;
方法二、
set pagesize 49999
set wrap off
setline 200
selectsequence#,first_time,nexttime,round(((first_time-nexttime)*24)*60,2) diff from(select sequence#,first_time,lag(first_time) over(order by sequence#) nexttimefrom v$log_history where
thread#=1) order by sequence# desc;
时间单位:分钟
方法一、
select * from v$log a where
a.THREAD# = 1 ;
set pagesize 49999
set wrap off?
set line 200
select b.SEQUENCE#,b.FIRST_TIME,a.SEQUENCE#,a.FIRST_TIME,round(((a.FIRST_TIME-b.FIRST_TIME)*24)*60,2) from v$log_history a, v$log_history b
where a.SEQUENCE#=b.SEQUENCE#+1 and b.THREAD#=1 order by a.SEQUENCE# desc;
方法二、
set pagesize 49999
set wrap off
setline 200
selectsequence#,first_time,nexttime,round(((first_time-nexttime)*24)*60,2) diff from(select sequence#,first_time,lag(first_time) over(order by sequence#) nexttimefrom v$log_history where
thread#=1) order by sequence# desc;
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