A database that stores its data in main memory to enable quicker reaction times is referred to as an in-memory database (IMDB, sometimes known as a main memory database or MMDB). From the performance point of view, in memory databases eliminate disk access bottlenecks.
Main memory databases operate faster than disk-optimized databases because their internal optimization techniques are simpler and use less CPU instructions. Since there is no seek time when data is accessed from memory, performance is faster and more stable than when it is retrieved from disk. As a result, in memory databases eliminate the disk access bottleneck from the perspective of performance.
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