I have to store more than 100 millions of key-values in my HashMultiMap (key can have multiple values). Can anybody help me, is this possible to implement using Java-MongoDB ? Is the performance of MongoDB approximately identical to in-memory hash map ? Pointer to some nice tutorial about how to create and maintain HashMap in MongoDB is also helpful to me.
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Title of your question is not at all helping. Try to make it as clear as possible. – Sergio Tulentsev Mar 31 '12 at 04:20
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Ok, I improved it a little bit more. `mongodb` is in the tags, and nobody cares that you are beginner. if you want to stress it, put into question text, not question title. – Sergio Tulentsev Mar 31 '12 at 04:25
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Again, I don't know how is your HashMultiMap is going to work, but in MongoDB you basically store objects in JSON (enhanced binary JSON, technically speaking).
So your document could look like this:
{
key1: [value1, value2, value3, ...],
key2: [value1, value2, value3, ...],
...
}
If that's gonna work for you - great.
Sergio Tulentsev
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Yah, I exactly want that structure with high performance in insertion and search for key. Is MongoDB a nice one than others ? – Arpssss Mar 31 '12 at 04:25
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Can you kindly inform from where I should start ? Actually, I want HashTabale/BTree for that and using Java. – Arpssss Mar 31 '12 at 04:27
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If you store one key per document than searching will be great. Insert performance [might be not as great](http://www.mongodb.org/display/DOCS/Padding+Factor), but should be good. – Sergio Tulentsev Mar 31 '12 at 04:27
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You start by downloading MongoDb and beginning to code :) Oh, and reading docs is also important. – Sergio Tulentsev Mar 31 '12 at 04:28
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Sorry, is it nice for solving this (http://stackoverflow.com/questions/9930347/multimap-space-issue-guava).. From your experience :) – Arpssss Mar 31 '12 at 04:36