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Just looking for what people see as the main differences when choosing between the two.
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Redis is faster than MongoDB because it's an in-memory database. This makes it a great choice for building complicated data structures quickly. MongoDB, however, suits most medium-sized businesses that need a reliable database. It's relatively simple and easy to use and, as we mentioned earlier, very scalable.
The general answer is that Redis 10 - 30% faster when the data set fits within working memory of a single machine.
When storing data, Redis stores data as specific data types, whereas Memcached only stores data as strings. Because of this, Redis can change data in place without having to re-upload the entire data value. This reduces network overhead.
Document oriented, JSON-like. Each document has unique key within a collection. Documents are heterogenous.
Key-value, values are:
After Wikipedia.
Disk, memory-mapped files, index should fit in RAM.
Typically in-memory.
By key, by any value in document (indexing possible), Map/Reduce.
By key.
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