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In-memory Data Store Meaning

A type of database that relies primarily on a computer's main memory (RAM) for data storage, rather than on spinning disks or SSDs. This allows for extremely high-speed data access and processing, with latency measured in microseconds.

It is the engine behind real-time analytics and high-frequency trading matching engines. Because RAM is "volatile"-meaning data is lost if the power is cut-in-memory stores often use "snapshots" or logging to save data to a disk periodically for persistence.

However, the primary "live" work happens in the RAM to ensure that the user experience is as close to instantaneous as possible. In the fintech world, these stores are used to manage "Order Books" where thousands of trades are matched every second.

By avoiding the bottleneck of physical disk I/O, the system can handle massive spikes in volume during periods of high market volatility without slowing down or crashing.

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