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12.03.2005 at 08:48AM PST, ID: 21651910
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7.8

Multiple case select statment

Asked by MarkNethercott in MS SQL Server

Tags: , ,

I need to calculate an average over a timespan on some data that is only posted to the database when the underlying value changes.

For example, if I'm monitoring the memory load of a process, a record is entered in the database every time the memory load changes.

At a point T in time , I want to find an average of the memory load over the previous N seconds/minutes/hours.

This gives me 2 cases

(1) Where the last posted value for the process is before T-N.  In this case, the average value over N is equal to the last posted value as the value hasn't changed.
(2) Where there are several values posted in the T-N timespan.  I'd then calculate the average of the memory values returned only in the T-N timespan.

I can return all the relevant information on the processes by selecting the processes that have a timestamp <= T, but I'm not sure how I then split the results out in to the two cases outlined above.

So far, my stored procedure is;

DECLARE @queryText1 varchar(8000)
DECLARE @queryText2 varchar(8000)

SET @queryText1 = 'SELECT ASProcessID, CPULoad, MemLoadKBytes, StatsTime FROM '
+ @RemoteTable +
' WHERE ASProcessID IN (SELECT ID FROM fnSplitStringToIDs(''' + @ProcessIDs + ''')) AND StatsTime <= ''' + @TimePoint + ''''

EXEC(@queryText1)

But I'm not sure what to do with the returned information.Start Free Trial
 
Keywords: Multiple case select statment
Title
1 how to get processId of a process
2 declare statment
3 convert datetime to varchar
4 Exec
5 Get ProcessId from ProcessHandle
6 nVarChar to VarChar
 
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[+][-]12.03.2005 at 10:15AM PST, ID: 15411771

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[+][-]12.03.2005 at 02:25PM PST, ID: 15412666

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[+][-]12.05.2005 at 04:26AM PST, ID: 15418767

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[+][-]12.05.2005 at 06:06AM PST, ID: 15419325

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[+][-]12.05.2005 at 06:46AM PST, ID: 15419611

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[+][-]12.05.2005 at 07:30AM PST, ID: 15419971

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[+][-]12.05.2005 at 11:25AM PST, ID: 15422076

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[+][-]12.05.2005 at 11:51AM PST, ID: 15422296

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About this solution

Zone: MS SQL Server
Tags: average, example, select
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Solution Provided By: BriCrowe
Participating Experts: 1
Solution Grade: A
 
 
[+][-]12.05.2005 at 02:27PM PST, ID: 15423653

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[+][-]12.05.2005 at 03:46PM PST, ID: 15424190

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[+][-]12.06.2005 at 01:06AM PST, ID: 15426143

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[+][-]12.06.2005 at 07:43AM PST, ID: 15428315

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[+][-]12.08.2005 at 10:16AM PST, ID: 15446687

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