Database In-Memory features a highly optimized In-Memory Column Store (IM column store) maintained alongside the existing buffer cache. The primary purpose of the IM column store is to accelerate columnoriented data accesses made by analytic operations. It is similar in spirit to having a conventional index (for analytics) on every column in a table. However, it is much more lightweight than a conventional index, requiring no logging, or any writes to the database. Just as the performance benefit to an application from conventional indexes depends on the amount of time the application spends accessing data in the tables that are indexed, the benefit from the IM column store also depends on the amount of time the application spends on data access for analytic operations. It is therefore important to understand the basic characteristics of your application to determine the potential benefits from Database In-Memory.
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