What do you do when you get more data that fits in disk?
You do the same with memory, either you buy more RAM, or you distribute the data across multiple hosts (that is what we are trying to do with Redis Cluster).
The whole point is, what order of magnitude is my data? Is memory a big enough storage for my needs?
For instance for Lamer News you can store many millions of news and comments in 1 GB. So it makes perfectly sense for this application. For other applications you want a mixed solution where fast meta-data is stored on Redis and larger documents on disk in some other database. For other apps you need Cassandra and nothing else, and for other apps a good SQL database. It depends, as usually :)
You do the same with memory, either you buy more RAM, or you distribute the data across multiple hosts (that is what we are trying to do with Redis Cluster).
The whole point is, what order of magnitude is my data? Is memory a big enough storage for my needs?
For instance for Lamer News you can store many millions of news and comments in 1 GB. So it makes perfectly sense for this application. For other applications you want a mixed solution where fast meta-data is stored on Redis and larger documents on disk in some other database. For other apps you need Cassandra and nothing else, and for other apps a good SQL database. It depends, as usually :)