FIX: Use of User-Defined Data Types from Two Different Databases in a Single Batch Causes Infinite Recompile (308756)

SYMPTOMS

SQL Server infinitely recompiles a batch when the batch uses different user-defined data types from two different databases.

The following example demonstrates the problem:

USE pubs
GO
EXEC sp_addtype 'type1', 'nvarchar(100)'
GO
USE northwind
GO
EXEC sp_addtype 'type2', 'nvarchar(100)'
GO

USE pubs
GO

USE pubs
DECLARE @p type1
USE northwind
DECLARE @p2 type2
GO
				

You will see the endless recompile for the last batch in the preceding sample.

WARNING: You may not want to test this script on a production server because the recompilation may introduce some overhead on the production system. You need to manually cancel the query or use the KILL command to terminate the system process ID (SPID) that is running the query to stop the recompilation.