脚本内容
col LOG_HOUR format a12
select to_char(first_time,'YYYY-mm-dd') LOG_DATE, to_char(first_time,'HH24') LOG_HOUR, count(*) SWITCHES from v$loghist group by to_char(first_time,'YYYY-mm-dd') , to_char(first_time,'HH24') order by 1,2;
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