large-xml-schema-collections-and-out-of-memory-conditions.md

title	description	author	ms.author	ms.reviewer	ms.date	ms.service	ms.subservice	ms.topic	helpviewer_keywords
Out-of-memory with large XML schema collections	Learn about solutions for handling out-of-memory conditions when loading or dropping a large XML schema collection.	MikeRayMSFT	mikeray	randolphwest	05/05/2022	sql	xml	conceptual	out-of-memory conditions XML schema collections [SQL Server], large

Large XML schema collections and out-of-memory conditions

[!INCLUDE SQL Server Azure SQL Database]

During a call to the built-in XML_SCHEMA_NAMESPACE() function on a large XML schema collection, or when you try to drop large XML schema collections, an out-of-memory condition may occur. The following are solutions you can use to handle this:

• When the system load is light, use the DROP_XML_SCHEMA_COLLECTION command. If this fails, put the database in single-user mode by using the ALTER DATABASE statement and trying DROP XML SCHEMA COLLECTION again. If the XML schema collection exists in master, model, or tempdb, a server restart is required for single-user mode.

• When you call the XML_SCHEMA_NAMESPACE, you can try to retrieve a single XML schema namespace, you can try the call when the system load is lighter, or you can try the call in single-user mode.

See also

• Requirements and Limitations for XML Schema Collections on the Server