Query Notification

ta5 · 2011-05-26

Hi

After installing NAV 2009 R2 3 tiers on 3 machines I got this message in the event log of the service tier machine:
"...Query Notifications are unavailable on SQL Server "xxx" in Database "xxx". The Object Change Listener has switched to polling".

If my unsterdanding ist correct, the service tier has 2 possiblities to check for changed db objects: 1. by query notifications und 2. by Object change listener (OCL) that queries against the table "Object Tracking".

Is this correct? If yes, is there a need for query notification at all? Thanks in advance
Thomas

kine · 2011-05-26

The query notification is better way than pooling. You know, pooling means new query each time and some delay. Query notification doesn't create query to the server...

ta5 · 2011-05-27

Thanks kine! Any other comments? Btw, Query notification is not part of the walkthrough "Installing the three tiers on three computers"...
Regards
Thomas

deV.ch · 2011-05-27

Here is something about it: http://blogs.msdn.com/b/nav/archive/201 ... n-rtc.aspx

ta5 · 2011-06-03

Thanks for all the contributions. I have also found this:

http://msdn.microsoft.com/en-us/library ... 9(v=nav.60).aspx
Have a look on the 2nd part of the page. Query notification is noted there and also identified as an optional step.

Regards
Thomas

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