I have to store more than 100 millions of key-values in my HashMultiMap (key can have multiple values). Can anybody help me which one is faster for both storing and searching:
1) Berkeley DB
3) H2
4) EhCache
5) Or anyothers
Another point, is performance of those approximately identical to in-memory hash map ? A little bit guidance will be more helpful. Thanks.
NB: information about any one of these is also helpful.
I'd recommend Redis. It's more of a data structure store than the others (e.g. it supports maps and sets) and requires very little effort to get started with. It's incredibly simple to use and has a great Java API.
I'd start by looking at the functions here that allow you to associate a key with a group of values.