sp_xml_removedocument (Transact-SQL)
Applies to: 
SQL Server
Azure SQL Database
Azure SQL Managed Instance
Removes the internal representation of the XML document specified by the document handle and invalidates the document handle.
A parsed document is stored in the internal cache of SQL Server. The MSXML parser (msxmlsql.dll) uses one-eighth the total memory available for SQL Server. To avoid running out of memory, run sp_xml_removedocument to free up the memory.
Transact-SQL syntax conventions
Syntax
sp_xml_removedocument hdoc
[ ; ]
Arguments
hdoc
The handle to the newly created document. A handle that isn't valid returns an error. hdoc is an integer.
Return code values
0 (success) or > 0 (failure).
Permissions
Requires membership in the public role.
Examples
The following example removes the internal representation of an XML document. The handle to the document is provided as input.
EXEC sp_xml_removedocument @hdoc;