The backend version is not supported to design database diagrams or tables

sql

compatibility-level

database-design

sql-server

byAlex Kataev·Dec 29, 2024

Dealing with the "The backend version not supported" error is usually due to a discrepancy between your SQL Server Management Studio (SSMS) and the actual SQL Server version. The solution is two-fold:

Compatibility Assurance: It's crucial to ensure your SSMS and SQL versions align.
Updating SSMS: Consider downloading the most recent SSMS that supports your SQL Server version from the official Microsoft page.

To quickly determine your SQL Server version, use the following command:

SELECT @@VERSION;

Once you've identified your SQL Server version, align your SSMS accordingly, using the compatibility documentation for reference.

Overcoming compatibility issues

Addressing version conflicts can smooth out your database design tasks. Here are some quick steps to optimize your compatibility:

Compatibility Level Adjustment: Even when using the latest SSMS, the "backend not supported" error may persist due to differing compatibility levels between the database and SQL Server. You can adjust these using ALTER DATABASE commands after checking Microsoft's compatibility guidelines.

--Adjust compatibility using ALTER DATABASE
--But first, check if the current level can be altered. 
--Otherwise, it would be like changing the fuel type of your car while it's running :D
ALTER DATABASE database_name  
SET COMPATIBILITY_LEVEL = { 140 | 130 | 120 | 110 | 100 | 90 }

Previewing SSMS v19: Testing the preview version of SSMS (v19) can potentially resolve some version-related errors. It's like tasting uncooked pasta, might just be al-dente!
SQL Express vs. SQL Server: Confirm your edition. The lighter SQL Server Express may lack some features compared to the full-fledged SQL Server. So ensure your Express train is headed to the right station!

Safeguarding against common pitfalls

Programming is fraught with subtle traps. Here are some precautions to keep your workflow error-free:

Avoid Conflicting Versions: Remember, more isn’t always merrier. Having multiple versions of SSMS may stir up conflicts. Stick with one, which ideally should be the latest and compatible with your SQL Server backend.
Installation Sequence: If your arsenal includes SQL Server Express, first complete its installation before updating SSMS. Trust me, putting the correct pieces of the puzzle together in the right order always helps!
Access the Correct Version: If having multiple SSMS versions is absolutely necessary, then make use of separate desktop shortcuts to always launch the right version. This extra step could spare you a lot of trouble.

Planning for Version Compatibility

Future-proofing your setup isn't just smart; it can save you loads of time later. Here are a couple of handy tips:

Stay Updated: Keep an eye out for new releases or patches for both SQL Server and SSMS. They not only provide new features but also resolve hidden bugs that might be causing version issues.
Regular Version Check: Be proactive and periodically check for version misalignments between your SQL Server and SSMS. It's like an annual health check-up, but for your database!