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Data & Analytics · Intermediate

In-Memory Database

A database that keeps its primary data in RAM for microsecond to millisecond access, often with optional persistence.

Definition

In-memory stores such as Redis, Memcached, SAP HANA and SQL Server In-Memory OLTP trade cost per GB for speed. They serve caches, leaderboards, session stores and real-time analytics. Persistence options include snapshots and append-only files.

Exam tip

Sub-millisecond reads for sessions or leaderboards point to Redis or another in-memory store.

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