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I had an ElastiCache redis running on Amazon and forgot to turn it off after testing for a month. And today, they charged me USD230.
Since this is my first time using Amazon and not even using a lot of memory, I'm just wondering if it's that expensive. If it is, imagine running full 16GB redis.
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As your data has grown, ElastiCache cost has skyrocketed a) Storing data in-memory is incredibly fast, but it's also really expensive.
The in-memory caching provided by Amazon ElastiCache can be used to significantly improve latency and throughput for many read-heavy application workloads (such as social networking, gaming, media sharing and Q&A portals) or compute-intensive workloads (such as a recommendation engine).
Amazon ElastiCache is a popular choice for real-time use cases like Caching, Session Stores, Gaming, Geospatial Services, Real-Time Analytics, and Queuing.
ElastiCache for Redis cluster provides the ability to add and remove shards from a running cluster. Supporting up to 250 nodes and shards, you can scale up to 155.17 TiB (170.6 TB) of in-memory data with 48.6 million reads and 9.7 million writes per second.
They certainly can be that expensive; for an ondemand instance pricing could be as low as around $12/month for a micro instance with ondemand pricing and as much as about $2750/month for a single r3.8xlarge.
Bummer that you wasted the money, but it could have been a lot worse if you had spun up their biggest instance to test on.
I often worry about making mistakes like that, so I review my costs almost daily, but at least every few days.
http://aws.amazon.com/elasticache/pricing/
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