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NoSQL Data Models

NoSQL Data Models

By : Olivier Pivert
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NoSQL Data Models

NoSQL Data Models

By: Olivier Pivert

Overview of this book

Big Data environments are now to be handled in most current applications, this book addresses the latest issues and hurdles that are encountered in such environments. The book begins by presenting an overview of NoSQL languages and systems. Then, you’ll evaluate SPARQL queries over large RDF datasets and devise a solution that will use the MapReduce framework to process SPARQL graph patterns. Next, you’ll handle the production of web data, generate a set of links between two different datasets and overcome different heterogeneity problems. Moving ahead, you’ll take the multi-graph based approach to overcome challenges faced by the RDF data management community. Finally, you’ll deal with the flexible querying of graph databases and textual data management. By the end of this book, you’ll have gathered essential information on big data challenges faced by NoSQL databases.
Table of Contents (11 chapters)
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Preface
8
List of Authors
9
Index
10
End User License Agreement

7.5. Real-time integration of novelty and diversity

We must recall that, in the Pub/Sub context, queries (subscriptions) are stored to be evaluated on-the-fly. Therefore, all the optimization is done in such a way as to process millions of queries on incoming items. One of the main techniques is to factorize treatments since there is a high probability that queries share the same operations.

7.5.1. Centralized implementation

In this section, we present our solution to quickly filter out items based on novelty and diversity criteria. It also allows us to efficiently store and manage items’ histories for all subscriptions.

7.5.1.1. Shared history

Since an item can belong to several histories, we need to avoid keeping all items. A simple solution consists in storing the last N notified items [ZHA 02] for each subscription and in factorizing histories by storing each item only once. However, the publication rate strongly differs from one source to another and this approach will impact...

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NoSQL Data Models
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