073eee46_n_Memory_Columnar_Store__IMCS___Recommendations
[Parameter name] imcs.serializable [Description] Hold lock till the end of transaction [Default value] true [Recommendations] 
Such locking policy provides serializable isolation level for columnar store. If this parameter is set to false, then lock is released at the end of query execution. It corresponds to "read committed" isolation level.
In-Memory Columnar Store (IMCS)
Recommendations