Redis vs. Mongo DB – The battle of the NoSQL databases continues | Hacker News Reader

Redis vs. Mongo DB – The battle of the NoSQL databases continues

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25 pointsyanivleven18 comments

At my last company, we used redis both for celery as a queue, and a cache for values we needed to call often and retrieve quickly. We ALSO used Mongo, but moreso as a store for larger documents that were called less frequently. I think it's not fair to compare them directly together, they are each useful in their own specific cases.

Mongo has a document size limit of 16MB, so 'larger documents' need to be qualified :).

The way I look at Redis is a service that helps to off-load main db. Obvious example is how people use it as a cache. But it has other use, such as:

- Leaderboard: Redis shines when we need to store ranking data. - Geo Query: Instead of query geo spatial index directly from MongoDB. I use Redis and feed the id back into MongoDB - Track Occurence Of Event: Let's say we need to keep track state of an user - Set of data

In other words, I treat Redis as a network/distributed data structure, which I can implement in the main db, but will require heavy read/write.

Apples and tangerines.

Love the speed and of Redis and the flexibility of Mongo.

I thought Redis was a cache, not a database.

What is a cache vs a database? You can use mysql as a cache. Most people would call it a database.

Really this article is dumb. I think almost never would you need to choose redis vs mongo.

Redis is a weird and hard to describe product. For example you can use it as a queue over rabbitmq with celery. Or a cache with all kinds of things. But it does more. And an empty instance runs in like 3mb of ram and handles thousands of connections.

A database is ACID, and here is a good analysis: https://dzone.com/articles/how-acid-mongodb

I strongly disagree, NoSQL databases are almost never ACID but they are almost always a database in how the term is used.

You can store data in it sure.

You can store data in text files too.

I thought Mongo was a cache, not a database.

Cassandra takes'em both

Is Redis web-scale?

Redis vs. MongoDB, seriously? Up next: choosing to die via hornets or scorpions.

Why do you hate redis?

Redis is great when used as a persistent cache for short-lived + no value data, or data that can be reproduced from another source. If your data, or queued items, have value then find a better tool.

But if you're foolish enough to use it as a database... lol.

Love the sport of Redis combined with the flexibility of Mongo.

Sport?

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