Synchronization performance issues of SQL Server Compact 3.5 merge replication

Microsoft Professional Advisory Services is a support option that provides short-term, proactive, consultative support beyond break-fix product maintenance needs. This includes working with the same technician for assistance with issues like product migration, code review, or new program development and is a remote, phone-based support option. This service is typically used for shorter engagements, and is designed for developers and IT professionals who do not require the traditional onsite consulting or sustained account management services that are available from other Microsoft support options.

For additional information on Microsoft Advisory Services, including on how to engage, refer to this Microsoft web page:

http://support.microsoft.com/gp/AdvisoryService (http://support.microsoft.com/gp/AdvisoryService)

When customers implement SQL Server Compact 3.5 merge replication, they may encounter synchronization performance issues. Typically, these issues occur when subscribers are on Windows Mobile devices. This Advisory Services scenario assists customers who are seeking consulting assistance on these issues.

Customers need assistance on synchronization performance issues. Questions may involve the following things:

• hardware resources on the device (memory, CPU, storage card)
• application performance
• network bandwidth (GPRS, wireless, LAN)
• resources on IIS and SQL Server
• schema enhancements for SQL Server Compact 3.5 replication
• upgrade performance comparing to earlier versions
• logging and tracing at client, network and server

 Recommendations on version compatibility and application tuning for performance.

Below is a list of self-help resources or this scenario. These resources may also be used by Microsoft Support Engineers during an Advisory Services engagement.

Performance: Tips for faster download of a large SQL Compact 3.5 database via Replication (http://blogs.msdn.com/b/sqlblog/archive/2009/06/24/performance-tips-for-faster-download-of-a-large-sql-compact-3-5-database-via-replication.aspx)

MEAP + Mobile Merge Replication Performance and Scalability Cheat Sheet (http://robtiffany.com/sql-server-compact/meap-mobile-merge-replication-performance-and-scalability-cheat-sheet)

PostSyncCleanup to turn off UpdateStatistics during initial download of SQL Compact Replication (http://blogs.msdn.com/b/sqlblog/archive/2009/04/15/sql-compact-performance-postsynccleanup-to-turn-off-updatestatistics-during-initial-download-of-sql-compact-replication.aspx)

FIX: An error message is logged, and the synchronization may take a long time to finish when you synchronize a merge replication that contains a SQL Server Compact 3.5 subscriber (http://support.microsoft.com/kb/963060)

ReplTalk Start Here (http://blogs.msdn.com/b/repltalk/archive/2010/02/07/repltalk-start-here.aspx)

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