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发表于: IP:您无权察看 2015-7-24 11:43:31 | [全部帖] [楼主帖] 楼主

 --列出Oracle日志文件切换的频率图

SELECT trunc(first_time) "日期",

to_char(first_time, 'Dy') "星期",

count(1) "总数",

round(24*60/count(1), 2) "平均每次切换分钟",

SUM(decode(to_char(first_time, 'hh24'), '00', 1, 0)) "h0",

SUM(decode(to_char(first_time, 'hh24'), '01', 1, 0)) "h1",

SUM(decode(to_char(first_time, 'hh24'), '02', 1, 0)) "h2",

SUM(decode(to_char(first_time, 'hh24'), '03', 1, 0)) "h3",

SUM(decode(to_char(first_time, 'hh24'), '04', 1, 0)) "h4",

SUM(decode(to_char(first_time, 'hh24'), '05', 1, 0)) "h5",

SUM(decode(to_char(first_time, 'hh24'), '06', 1, 0)) "h6",

SUM(decode(to_char(first_time, 'hh24'), '07', 1, 0)) "h7",

SUM(decode(to_char(first_time, 'hh24'), '08', 1, 0)) "h8",

SUM(decode(to_char(first_time, 'hh24'), '09', 1, 0)) "h9",

SUM(decode(to_char(first_time, 'hh24'), '10', 1, 0)) "h10",

SUM(decode(to_char(first_time, 'hh24'), '11', 1, 0)) "h11",

SUM(decode(to_char(first_time, 'hh24'), '12', 1, 0)) "h12",

SUM(decode(to_char(first_time, 'hh24'), '13', 1, 0)) "h13",

SUM(decode(to_char(first_time, 'hh24'), '14', 1, 0)) "h14",

SUM(decode(to_char(first_time, 'hh24'), '15', 1, 0)) "h15",

SUM(decode(to_char(first_time, 'hh24'), '16', 1, 0)) "h16",

SUM(decode(to_char(first_time, 'hh24'), '17', 1, 0)) "h17",

SUM(decode(to_char(first_time, 'hh24'), '18', 1, 0)) "h18",

SUM(decode(to_char(first_time, 'hh24'), '19', 1, 0)) "h19",

SUM(decode(to_char(first_time, 'hh24'), '20', 1, 0)) "h20",

SUM(decode(to_char(first_time, 'hh24'), '21', 1, 0)) "h21",

SUM(decode(to_char(first_time, 'hh24'), '22', 1, 0)) "h22",

SUM(decode(to_char(first_time, 'hh24'), '23', 1, 0)) "h23"

from v$log_history

--FROM gV$log_history

group by trunc(first_time), to_char(first_time, 'Dy')

Order by 1 desc

--转自 北京联动北方科技有限公司




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