SQL Server query buildup - sql

Question

I have a set with data in a SQL Server database and I need to calculate uptime of a machine. I'm using two variables to determine uptime or downtime. These two variables are machine_ON and failure(s). machine_ON is only one variable in the database, failure can be 64 different failures, but all indicates as fx_x.
The status information of these variables is stored in the database as follow:
timestamp failurebitNr timestampOutOfAlarm
2012-01-17 10:38:58.000 f1_14 2012-01-17 10:39:05.000
Meaning: failure f1_14 was active from 2012-01-17 10:38:58.000 until 2012-01-17 10:39:05.000
Also the machine_ON state is saved in the same table on the same way, only the failurebitNr has a different value [t2_13].
So to determine the uptime, I need to get the timediff between timestamp and timestampOutOfAlarm where failurebutNr = 't2_13' minus any failure time.
So for example I have those rows in my database:
This should give the following graphical representation:
Green is uptime, red is downtime.
I'm used to work with PHP and than use a while loop and file some array's and do other scripting. But now I need to do this all in a SQL Server database in query ways...
So, how can I calculate the uptime (green) and downtime (red)?
UPDATE
I've tried to get the time in seconds that the machine is ON. I used this query:
<!-- language: lang-sql -->
DECLARE #startDate datetime
DECLARE #endDate datetime
DECLARE #projectNr int
DECLARE #MachineNr nvarchar(10)
SET #startDate = '2012-01-01 00:00:00.000'
SET #endDate = '2012-02-01 00:00:00.000'
SET #projectNr = '1234567'
SET #MachineNr = '2'
SELECT
DATEDIFF("SECOND",
CASE WHEN timestamp < #startDate
THEN #startDate
ELSE timestamp
END,
CASE WHEN timestampOutOfAlarm > #endDate OR timestampOutOfAlarm IS NULL
THEN #endDate
ELSE timestampOutOfAlarm
END) AS Uptime
FROM
[table]
WHERE
timestamp < #endDate
AND (timestampOutOfAlarm > #startDate OR timestampOutOfAlarm IS NULL)
AND fileProjectNr = #projectNr
AND fileProjectMachineNr = #MachineNr
AND (failureBitNr = 't2_13' AND failureBitValue = '1')

Answer 1

Problem solved:
I did it in 2 stored procedures, or Query's. One for getting the "ON" time and one for getting all the "DOWN" time within the "ON" time. Whith those two times I can calculate the uptime, downtime, maintenance time.
Query for ON time:
<!-- language: lang-sql -->
SELECT fctAlarmId,
fileProjectNr,
fileProjectMachineNr,
failureBitNr,
timestamp,
CASE WHEN timestampOutOfAlarm > #endDate OR timestampOutOfAlarm IS NULL
THEN #endDate
ELSE timestampOutOfAlarm
END
AS timestampOutOfAlarm
INTO #tempTable1
FROM fctAlarmHistory
WHERE (timestampOutOfAlarm >= #startDate OR timestampOutOfAlarm = NULL)
AND timestamp < #endDate
AND failureBitValue = 1
AND failureBitNr = 't2_13'
AND fileProjectNr = #projectNr
And fileProjectMachineNr = #ProjectMachineNr
-- SUM the result of all ON times into OnTime in seconds
SELECT
SUM(DATEDIFF("SECOND",
CASE WHEN timestamp < #startDate
THEN #startDate
ELSE timestamp
END,
CASE WHEN timestampOutOfAlarm > #endDate
THEN #endDate
ELSE timestampOutOfAlarm
END)) AS OnTime
FROM
#tempTable1
Query for Downtime during ON time:
<!-- language: lang-sql -->
SELECT fctAlarmId,
fileProjectNr,
fileProjectMachineNr,
failureBitNr,
timestamp,
CASE WHEN timestampOutOfAlarm > #endDate OR timestampOutOfAlarm IS NULL
THEN #endDate
ELSE timestampOutOfAlarm
END
AS timestampOutOfAlarm
INTO #tempTable1
FROM fctAlarmHistory
WHERE (timestampOutOfAlarm >= #startDate OR timestampOutOfAlarm = NULL)
AND timestamp < #endDate
AND failureBitValue = 1
AND failureBitNr = 't2_13'
AND fileProjectNr = #projectNr
And fileProjectMachineNr = #ProjectMachineNr
SELECT fctAlarmId,
fileProjectNr,
fileProjectMachineNr,
failureBitNr,
timestamp,
CASE WHEN timestampOutOfAlarm > #endDate OR timestampOutOfAlarm IS NULL
THEN #endDate
ELSE timestampOutOfAlarm
END
AS timestampOutOfAlarm
INTO #tempTable2
FROM fctAlarmHistory
WHERE (timestamp BETWEEN #startDate AND #endDate)
AND failureBitValue = 1
AND (failureBitNr LIKE'f%')
AND fileProjectNr = #projectNr
And fileProjectMachineNr = #ProjectMachineNr
CREATE TABLE #tempTable3
(
ID int IDENTITY(1,1),
timestamp datetime,
timestampOutOfAlarm datetime
)
DECLARE failure_Cursor CURSOR FOR
SELECT timestamp, timestampOutOfAlarm
FROM #tempTable2
ORDER BY timestamp ASC
OPEN failure_Cursor
-- Perform the first fetch.
FETCH NEXT FROM failure_Cursor
INTO #rij_timestamp, #rij_timestampOutOfAlarm
INSERT INTO #tempTable3 (timestamp, timestampOutOfAlarm) VALUES(#rij_timestamp,#rij_timestampOutOfAlarm)
-- Check ##FETCH_STATUS to see if there are any more rows to fetch.
WHILE ##FETCH_STATUS = 0
BEGIN
PRINT #rij_timestamp
IF #rij_timestamp <= (SELECT TOP 1 timestampOutOfAlarm FROM #tempTable3 ORDER BY timestamp DESC)
BEGIN
IF #rij_timestampOutOfAlarm > (SELECT TOP 1 timestampOutOfAlarm FROM #tempTable3 ORDER BY timestamp DESC)
BEGIN
UPDATE #tempTable3 SET timestampOutOfAlarm = #rij_timestampOutOfAlarm WHERE ID = (SELECT TOP 1 ID FROM #tempTable3 ORDER BY timestamp DESC)
END
END
ELSE
INSERT INTO #tempTable3 (timestamp, timestampOutOfAlarm) VALUES(#rij_timestamp,#rij_timestampOutOfAlarm)
FETCH NEXT FROM failure_Cursor
INTO #rij_timestamp, #rij_timestampOutOfAlarm
END
CLOSE failure_Cursor
DEALLOCATE failure_Cursor
-- Select the failure time.
SELECT
SUM(DATEDIFF("SECOND",
CASE WHEN tt3.timestamp < #startDate
THEN #startDate
ELSE tt3.timestamp
END,
CASE WHEN tt3.timestampOutOfAlarm > tt1.timestampOutOfAlarm
THEN tt1.timestampOutOfAlarm
ELSE tt3.timestampOutOfAlarm
END)) AS DownTime
FROM
#tempTable3 tt3
INNER JOIN
#tempTable1 tt1
ON
tt3.timestamp BETWEEN tt1.timestamp AND tt1.timestampOutOfAlarm