Assume that you have a database that has Read Committed Snapshot Isolation (RCSI) enabled by setting option READ_COMMITTED_SNAPSHOT on in Microsoft SQL Server 2014. When you access both a memory-optimized table and a memory-optimized table variable in the same statement outside the context of a user transaction, the operation may fail. Additionally, you may receive the following error:
Msg 41359. A query that accesses memory optimized tables using the READ COMMITTED isolation level, cannot access disk based tables when the database option READ_COMMITTED_SNAPSHOT is set to ON. Provide a supported isolation level for the memory optimized table using a table hint, such as WITH (SNAPSHOT).
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To work around the issue, use the following workarounds:
Use the table hint WITH (SNAPSHOT) with the table variable.
Set the database option MEMORY_OPTIMIZED_ELEVATE_TO_SNAPSHOT to ON.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.