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Process\Private Bytes (sqlserver)

Posted on 2013-05-19
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Last Modified: 2013-05-20
Hi Experts!

I have this application server which is running 24/7 (peak average at 3AM to 12noon). I tried to use performance monitor for three days because I'm wondering why I always need to reboot the server every three days. On the first day, the application is fast, on the second day, it will become gradually slow then on the third day, it is very slow to the point that users get frustrated with the application.

I read the .csv file and noticed these counters:

Memory\Available MBytes

May 17
      Min - 8,194
      Avg - 8,728
      Max - 9,179

May 18
      Min - 7,417
      Avg - 8,033
      Max - 8,668

May 19
      Min - 6,690
      Avg - 7,121
      Max - 7,610


Process\Private Bytes (sqlserver)

May 17 (Friday) - Peak at 3AM to 12noon
      Min - 4,872,523,776
      Avg - 5,065,575,668
      Max - 5,793,427,456

May 18 (Saturday) - Peak at 5AM to 12 noon
      Min - 5,791,735,808
      Avg - 6,041,063,052
      Max - 6,582,472,704

May 19 (Sunday) - Peak at 5AM to 12 noon
      Min - 6,577,823,744
      Avg - 6,581,372,412
      Max - 6,588,833,792

I notice that Available MBytes are getting low, and Private Bytes are getting high overtime.
If you see this kind of scenario, what will be your impression and what other counters I need in relation to these counters?

Thank you.
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Question by:MediaBanc
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6 Comments
 
LVL 35

Expert Comment

by:David Todd
ID: 39179833
Hi,

Is the application on the same server as the database?

Instead of rebooting the server, does restarting the application have the same effect? Is there a service or two which restarting will have the same effect?

For looking at a SQL Server try these counters:
http://www.brentozar.com/archive/2006/12/dba-101-using-perfmon-for-sql-performance-tuning/

HTH
  David
0
 

Author Comment

by:MediaBanc
ID: 39179841
Hi dtodd,

Is the application on the same server as the database?
Yes.

Instead of rebooting the server, does restarting the application have the same effect?
Yes.

Is there a service or two which restarting will have the same effect?
I tried also restarting their other services, still the same.

Thanks!
0
 
LVL 35

Expert Comment

by:David Todd
ID: 39180105
Hi

Is the application written in house or a third party, shrink wrap or bespoke?

Do you have another server to migrate the app to?

Suggest that you go over app code for memory leaks.

Regards
  David
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Author Comment

by:MediaBanc
ID: 39180145
Hi David,

This is a third party / shrink wrap application. Right now I don't have extra server to migrate my app.

How can we say that it might me a memory leak?

Thanks!
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LVL 35

Accepted Solution

by:
David Todd earned 500 total points
ID: 39180238
Hi

If third-party shrink-wrap, you need to contact the vendor.

Obviously, if restarting the app brings performance back, then it's the app and not the DB.

Regards
  David
0
 

Author Comment

by:MediaBanc
ID: 39180291
Hi David,

Maybe I'll try first experiment restarting one service at a time. Since I have initial findings on this one.

Thank you!
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