Detection of unsupported features

While Synapse Analytics supports a broad range of system-level operations, including user management, diagnostics, and configuration through system procedures and catalog views, Microsoft Fabric Warehouse only supports a limited subset of these features. System objects such as sp_addrolemember, sys.dm_* views, and T-SQL commands like DBCC or ALTER DATABASE are not available in Fabric’s SQL environment.

SQL Tran intelligently detects unsupported features during translation. Instead of attempting to rewrite or remove these constructs, it flags them with diagnostic comments. Important statements are preserved in the translated code, marked clearly for manual review.

This approach ensures that critical administrative or diagnostic logic is not silently lost and highlights areas that require human attention, saving time and reducing the risk of overlooked incompatibilities.

(For more information, see the following emulation reference page: Unsupported system features)

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Code example

Synapse Analytics:

CREATE PROCEDURE [dbo].[GetPromotedPeople]
AS
BEGIN
    SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;

	SELECT BusinessEntityID, FirstName, LastName, EmailPromotion
	FROM Person.Person
	WHERE EmailPromotion > 0
	ORDER BY EmailPromotion DESC;
END;

Fabric Warehouse (generated by SQL Tran):

-- SQLTRAN FABRIC LIMITATION: -- SET TRANSACTION ISOLATION LEVEL
CREATE PROCEDURE [dbo].[GetPromotedPeople]
AS
BEGIN
    SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;

	SELECT BusinessEntityID, FirstName, LastName, EmailPromotion
	FROM Person.Person
	WHERE EmailPromotion > 0
	ORDER BY EmailPromotion DESC;
END;

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Training video example

In the example shown, a procedure contains a SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED statement — a feature that is not supported in Fabric.

SQL Tran detects this unsupported construct and preserves the statement in the target SQL while emitting a diagnostic comment to flag the limitation.

This ensures that intentional constructs are not discarded during translation and can be reviewed and adjusted manually where necessary.

Unsupported features detection in translated SQL