Oracle downtime in minutes per month - sql

Question

This is written in Oracle 11g or 12c...
Hello,
I am attempting to shape this data into hours of downtime for the previous 12 months, shaped this way to support a graph.
In the Oracle SQL query below, the commented query "M" shows how to put in one record per month. The query "M" shows the final shape I need, except that I need the downtime minutes to fall into each monthly bin.
The data however, is provided by query "D", which I have mocked up for the sake of this example. Of course, a better example might show more edge cases, such as spanning the first of a month, etc. But this example will suffice.
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));
The result now looks like this:
SINCE UP_TIME DOWN_TIME BLACKOUT_TIME
9/25/2015 3:12:47 PM 385,392
11/25/2015 3:12:00 PM 1,440
11/26/2015 3:12:00 PM 200,122
but I need it to look like this:
MO DOWN_MINUTES
3/1/2016 0
2/1/2016 0
1/1/2016 0
12/1/2015 0
11/1/2015 1440
10/1/2015 0
9/1/2015 0
8/1/2015 0
7/1/2015 0
6/1/2015 0
5/1/2015 0
4/1/2015 0
P.S.: For the benefit of the group, the actual downtime in query "M" is generated by the following query, which reads from Oracle Enterprise Manager:
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);
Thank you in advance. I have been spinning my wheels on this for days and it's time to ask for help.

Answer 1

try this:
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;