How many records can Redis handle?
Also to know is, how much RAM do I need for Redis?
Similarly, does Redis keep all data in memory? Redis is an in-memory database because it keeps the whole data set in memory, and answers all queries from memory. Because RAM is faster than disks, this means Redis always has very fast reads. They always keep the whole data set including indices on disk in a format that allows random access.
Also to know is, how many requests per second can Redis handle?
As previously measured, a benchmark setting 100 Bytes values for each key in Redis, would be hard limited by the network at around 32 million queries per second per VM. Even for 1000 Bytes values, Redis would only be hard limited by the network at around 3 million queries per second per VM.
When should you not use Redis?
We will not want to use Redis for use cases like these:
- Storing large amounts of data in a single string value (e.g. the most recent feed contents for each user).
- Storing data across two or more dimensions (e.g. a score for each (user, topic) pair).
- Storing data that requires queries with high time complexity.