Assume you have a table with an xml column and you create a primary XML index on the xml column. When you run a query that uses CROSS or OUTER APPLY against the table, an access violation may occur. Dropping the primary XML index willstop access violations from occurring, but may negatively affect performance.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
This issue is fixed in the following cumulative update for SQL Server:
About cumulative updates for SQL Server:
Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. Check out the latest cumulative updates for SQL Server: