Does Redis store data in memory?

Question

All Redis data resides in memory, which enables low latency and high throughput data access. Unlike traditional databases, In-memory data stores don't require a trip to disk, reducing engine latency to microseconds.

Is Redis persistent or in-memory?

Data size is predictable and limited: Redis data is always kept in memory, even when backup to disk, and RAM is much more expensive than Hard drive (the cost of a 500GB RAM cluster in any Cloud provide environment will convince you of that).

Can Redis store data forever?

Redis has various options to save the data to permanent storage. This permanent representation can then be used to rebuild the in-memory state of a Redis instance. However, this representation is not indexed and cannot be used to answer queries directly from disk. This is in stark contrast to databases like Postgres.

Is Redis distributed or in-memory?

Redis is an in-memory data store that is most often used as a distributed cache. It offers a variety of efficient data structures designed to allow brutally fast access to your data.

How is Redis data stored?

Since Redis is an in-memory database, data is stored in memory (or RAM). If a server crashes, all the data stored is lost. Redis has back-up mechanisms in place for the data on the disk. This way, the data is loaded from the disk to the memory when the server reboots.

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