每月 Oracle 停机时间（以分钟为单位）

Question

这是用 Oracle 11g 或 12c 编写的...

你好，

我试图将这些数据转化为过去 12 个月的停机时间，以这种方式形成以支持图表。

在下面的 Oracle SQL 查询中，注释查询“M”显示了如何每月放入一条记录。查询“M”显示了我需要的最终形状，除了我需要将停机时间放入每个月的 bin 中。

然而，数据是由查询“D”提供的，为了这个例子，我已经模拟了它。当然，更好的示例可能会显示更多边缘情况，例如跨越一个月的第一天等。但是这个示例就足够了。

WITH 
/*
  M AS (  
    SELECT ADD_MONTHS (TRUNC (SYSDATE, 'MONTH'), -1 * LEVEL) AS MO
    , 0 AS DOWNTIME FROM DUAL
     CONNECT BY LEVEL <= 12),
*/
D AS (  -- data simulating a downtime day
     SELECT 'Target Up' AS AVAILABILITY_STATUS,
            TO_DATE ('9/25/2015 15:12:47', 'MM/DD/YYYY HH24:MI:SS')
               AS SINCE,
            385392 AS MINUTES
       FROM DUAL
     UNION ALL
     SELECT 'Target Down' AS AVAILABILITY_STATUS,
            TO_DATE ('11/25/2015 15:12:00', 'MM/DD/YYYY HH24:MI:SS')
               AS SINCE,
            1440 AS MINUTES
       FROM DUAL
     UNION ALL
     SELECT 'Target Up' AS AVAILABILITY_STATUS,
            TO_DATE ('11/26/2015 15:12:00', 'MM/DD/YYYY HH24:MI:SS')
               AS SINCE,
            200122 AS MINUTES
       FROM DUAL)
SELECT *
FROM D
   PIVOT
      (SUM (MINUTES)
      AS TIME
      FOR AVAILABILITY_STATUS
      IN ('Target Up' AS UP,
         'Target Down' AS DOWN,
         'Blackout' AS BLACKOUT));

结果现在看起来像这样：

SINCE UP_TIME DOWN_TIME BLACKOUT_TIME 2015 年 9 月 25 日下午 3:12:47 385,392 2015 年 11 月 25 日下午 3:12:00 1,440 2015 年 11 月 26 日下午 3:12:00 200,122

但我需要它看起来像这样：

MO DOWN_MINUTES 2016 年 3 月 1 日 0 2016 年 2 月 1 日 0 2016 年 1 月 1 日 0 2015 年 12 月 1 日 0 2015 年 11 月 1 日 1440 2015 年 10 月 1 日 0 2015 年 9 月 1 日 0 2015 年 8 月 1 日 0 2015 年 7 月 1 日 0 2015 年 6 月 1 日 0 2015 年 5 月 1 日 0 2015 年 4 月 1 日 0

P.S.：为了小组的利益，查询“M”中的实际停机时间由以下查询生成，该查询从 Oracle Enterprise Manager 读取：

WITH X
 AS (SELECT START_TIMESTAMP,
            NVL (END_TIMESTAMP, SYSDATE) AS END_TIMESTAMP,
            AVAILABILITY_STATUS,
            TRUNC (
               (NVL (END_TIMESTAMP, SYSDATE) - START_TIMESTAMP) * 24 * 60)
               MINUTES
       FROM MGMT$AVAILABILITY_HISTORY
      WHERE     AVAILABILITY_STATUS IN
                   ('Target Down', 'Target Up', 'Blackout')
  )
  SELECT AVAILABILITY_STATUS,
     MIN (START_TIMESTAMP) AS SINCE,
     SUM (MINUTES) AS MINUTES
  FROM X
GROUP BY AVAILABILITY_STATUS
ORDER BY MIN (START_TIMESTAMP);

提前谢谢你。这几天我一直在旋转我的车轮，是时候寻求帮助了。

Answer 1

试试这个：

WITH 
M AS (  
    SELECT ADD_MONTHS (TRUNC (SYSDATE, 'MONTH'), -1 * LEVEL) AS MO
    , 0 AS DOWNTIME FROM DUAL
    CONNECT BY LEVEL <= 12),

D AS (  -- data simulating a downtime day
     SELECT 'Target Up' AS AVAILABILITY_STATUS,
            TO_DATE ('9/25/2015 15:12:47', 'MM/DD/YYYY HH24:MI:SS')
               AS SINCE,
            385392 AS MINUTES
       FROM DUAL
     UNION ALL
     SELECT 'Target Down' AS AVAILABILITY_STATUS,
            TO_DATE ('11/25/2015 15:12:00', 'MM/DD/YYYY HH24:MI:SS')
               AS SINCE,
            1440 AS MINUTES
       FROM DUAL
     UNION ALL
     SELECT 'Target Up' AS AVAILABILITY_STATUS,
            TO_DATE ('11/26/2015 15:12:00', 'MM/DD/YYYY HH24:MI:SS')
               AS SINCE,
            200122 AS MINUTES
       FROM DUAL)
SELECT M.mo, Nvl(s, 0) AS minutes
FROM M
     LEFT JOIN (  SELECT TRUNC (SINCE, 'MONTH') AS D, SUM (MINUTES) AS S
                    FROM D
                   WHERE AVAILABILITY_STATUS = 'Target Down'
                GROUP BY TRUNC (SINCE, 'MONTH')) GR
        ON GR.D = M.MO
ORDER BY 1;