MS Sync Framework - SQL Change Tracking issue

Need some recommendation or suggestion on SQL Change Tracking Rention period
we are using MS Synchronization framework 2.1 to synchronize the data from SQL Server to WinCe 3.5 devices ( SQL CE 3.5 )
As part of the solution, we have used SQL Change tracking feature to keep track of data changes happened on the server to download the data.
For change tracking, we have set the database retention period to 10 days.
Everything works fine in the normal scenarios.
Issue : When a new device is installed after 10 days of the data changes on the server, because of retention period, the changes older than 10 days are not downloaded to the devices.
If you increase the retention period , it retains the data for the period.
Required suggestion
what is the best configuration value for the retention period?
can we set it to 2 or 3 years? is there any performance impact because of retention is set to maximum period.
Is there any alternative approach to configure for minimum period and synchronize the require changes.
Note: we are downloading changes only from server. it is download only configuration.

Hi,
When you are setting the change retention value, you should consider how often applications will synchronize with the tables in the database. The specified retention period must be at least as long as the maximum time period between synchronizations.
If an application obtains changes at longer intervals, the results that are returned might be incorrect because some of the change information has probably been removed. To avoid obtaining incorrect results, an application can use the CHANGE_TRACKING_MIN_VALID_VERSION
system function to determine whether the interval between synchronizations has been too long.
Considering the performance impact, it is related to what it tracks changes for and the size of increment.
For more information, see:
http://msdn.microsoft.com/en-us/library/bb964713.aspx
Thanks.
Tracy Cai
TechNet Community Support

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SQL Change tracking

Hi Expert
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does any one have a demo or could any one explain by step by step process as am not much familier with SQL.
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Hi gordon
Thnks for the replay
Sir, am not much expert in SQL, just know to write the query. pls could u help me by giving the query for checking a particular table
[@ABCEMALW]
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by reducing the speed in the timeline, i think it does the same thing as forcing interpret footage. the difference is by changing it in the bin before starting, you can change all clips at once. just make sure to set the sequence fps to the final output fps, not matching the changed fps of clips. you can also right click the footage on the timeline and choose frame blend, but i think it ends up doing the same thing as the export option you are using. the difference on the timeline is you can see the frame blend while editing. AE is extremely slow and might not look any better, so where u are on deadline, forget about it. so in premiere i think frame blend on vs off is your only real option to change the behavior of the slow-mo.
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BOM quantity changes tracking issue - please help

hi,
we use Engineering change management and change BOM with reference to a change number .
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hi,
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An excerpt from Oracle RMAN 11g Backup and Recovery by Robert G. Freeman & Matthew Hart
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<original post by Glenn Estrada>
Reposting an issue from Stack Overflow that a coworker and I are dealing with.
In trouble shooting an issue with synchronizing disconnected devices with a central database server using Sync Framework 1.0, we are experiencing a problem after upgrading to SQL Server 2012 on the server. It appears that the CHANGE_TRACKING_MIN_VALID_VERSION
is returning a value 1 higher than it should (or at least than it did prior to the upgrade.)
I have been working thru Arshad
Ali's great walk thru example of how to set up a simple example.
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<original post by Glenn Estrada>
Reposting an issue from Stack Overflow that a coworker and I are dealing with.
In trouble shooting an issue with synchronizing disconnected devices with a central database server using Sync Framework 1.0, we are experiencing a problem after upgrading to SQL Server 2012 on the server. It appears that the CHANGE_TRACKING_MIN_VALID_VERSION
is returning a value 1 higher than it should (or at least than it did prior to the upgrade.)
I have been working thru Arshad Ali's
great walk thru example of how to set up a simple example.
I have run the scripts from #1 thru #5 to insert, delete, and update a row in the Employee table in both a SQL Server 2008 and a 2012 environment.
In 2008, the following statement returns a 0:
SELECT CHANGE_TRACKING_MIN_VALID_VERSION(OBJECT_ID('Employee'))
In 2012, it returns a 1.
In working thru a few more scripts (6-8) in the tests, I set the retention period to 1 minute to hopefully force a cleanup action. I left for the day and apparently it ran overnight.
In the 2008 instance, the CHANGE_TRACKING_CURRENT_VERSION and the CHANGE_TRACKING_MIN_VALID_VERSION are equal (11). In the 2012 instance, the CHANGE_TRACKING_MIN_VALID_VERSION is one higher (12) than the CHANGE_TRACKING_CURRENT_VERSION (11). This could have
an impact to the synchronization process when a database is idle for extended periods of time. And we have found that process could get caught in a loop, especially when the following test is performed to determine if a re-initialization, as opposed to synchronization,
is required:
IF CHANGE_TRACKING_MIN_VALID_VERSION(object_id(N'dbo.Employee')) > @sync_last_received_anchor
RAISERROR (N'SQL Server Change Tracking has cleaned up tracking information for table ''%s''...
Has anyone else experienced this change in behavior? Does anyone have an explanation?
sql-server sql sql-server-2012

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Hi All,
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Hi Johns-305,
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I'm not totally agreed with you about the notification because it depends on the situation.
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I'm using sql server management studio express 2005 , wanted to turn function "change tracking" for Northwind database, but when I clicked properties for northwind, there wasn't any tab for change tracking. what's the deal?
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Chris

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Change tracking version

I would like to get change tracking version for specific database(not the one stored procedure is running), something like:
SELECT someDB.dbo.CHANGE_TRACKING_CURRENT_VERSION();
Is that possible?
br, Simon

Have you enabled CDC in your database and for your table?
http://www.databasejournal.com/features/mssql/getting-starting-with-change-data-capture-cdc-in-sql-server-part-2.html
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MS Sync Framework - SQL Change Tracking issue

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