Database Corruption From Simple Query

Hi- I have questions about mobile database limits. The application is entirely C# / Compact Framework 2.0, using VS2005. Devices we support are all running WM5. We're trying to incorporate what seems to be a large database that the application needs to talk to offline from any network, so it needs to be stored & hosted within the database and hence we started working with the various generations of what is now SQL Server Compact Edition.

In order to profile the responsiveness I worked up a test database with the general collection of fields we are interested in. The main table has 80,000 rows with one primary key and one of the numeric fields indexed. There is a 'nickname' table which contains about 150,000 items with just a string for a nickname and the key that nickname goes with. With all the rows and an alpha index for the nickname field the database is about 42 mb. Which is pushing the amount of storage on the handheld, but of our two models one is fine and one still has about 30 mb free with the DB on the handheld.

My problem seems to be that one kind of device can work with this database and one cannot. The device I was using the prototype the application is a HP iPAC hx2490b. On that device more than once I have corrupted the database, but not yet as a reproducible process.

My other device is a Dell Axim X51. On that device I seem to corrupt the database with very simple actions. Just now I tried a query like (From the Query Analyzer 3.0)





Code Snippet

Select * from ReagentNicknamesTable where alt_names like 'alpha%'

Which should hit 2099 of the 150,000 records. I got about 400 back and then the table was corrupted. On this device I cannot recover the database as there isn't enough disk space for two copies of the DB. So corruption in the field would be a showstopper. But getting corruption from a simple query like this means I really can't use SSCE.

This problem with the dell showed up when I was using the original device sql that came with VS2005. (SQL Server Mobile?) The cabs & dll's were dated from 2005 and had a build number of 3.0.5206.0. I have since updated to the current version of SQL Server Compact Edition and the dlls have build number 3.0.5300.0. The IDE is set to Compact Framwork 2.0, sp1: cgacutil reports CF 2.0.6129.0.

So help! Have I hit some listed or unlisted limits to SSCE on the Compact Framework? thanks.