Questions tagged [mongodb]

All versions of MongoDB - a scalable, high-performance, open source, document-oriented database.

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Setting up Mongo with clustering

I'm going to start using Mongo as a database but I will not have it clustered at first. Can I use Mongo on a single machine, then later come back, cluster it and capitalize on the sharding? Or can I ...
7
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1answer
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Mongo Map-Reduce or Sharding?

So I asked this question: Setting up Mongo with clustering But I didn't know enough until I read the answers and did more research. Is it better to use Map-reduce or sharding for fast-paced ...
16
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1answer
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How do databases store index key values (on-disk) for variable length fields?

Context This question pertains to the low-level implementation details of indexes in both SQL and NoSQL database systems. Actual structure of the index (B+ tree, hash, SSTable, etc.) is irrelevant as ...
4
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1answer
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Would appreciate some suggestions on how I should model this data

I am setting up a website that will have users. Users can search for songs and (if signed in) save them to a playlist or their library of songs. I want it to be like iTunes in that all the songs on ...
6
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1answer
3k views

In MongoDB, is having lots of small collections better than having one huge collection?

Huge collections have huge indexes that may not fit into RAM. Is that problem entirely solved with sharding ? If I have lots of small collections with small indexes, what are the options for storing ...
3
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2answers
193 views

What are the best Database Analytics Companies for analyzing several 1000s or Mio. of products,sum them together and analyze them for statistics?

We will get several thousands products in our database. The problem is that one product can have several different names e.g. "iPad 16GByte UMTS schwarz" or "iPad 16GB 3G black" and so on. But they ...
12
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2answers
912 views

Is sharding effective for small collections?

It looks like database sharding is great if I have huge collections. What if I have lots of fairly sized collections ? Let's say that for 1 collection of 100 000 000 documents (not very big comments) ...
8
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2answers
1k views

Is there any way to efficiently perform the equivalent of DENSE_RANK in MongoDB?

SQL Server and Oracle both have DENSE_RANK functions. Is there a way to do something similar in MongoDB without having to resort to MapReduce? In other words, suppose you have a T-SQL select clause ...
18
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2answers
1k views

CouchDB vs MongoDB [closed]

Evaluating document-oriented storage, what are the pros and cons of CouchDB vs MongoDB?

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