1. IRIT Université Toulouse Capitole France @irit.fr 2. CEDRIC – CNAM Paris – France @cnam.fr 3. CBI Sté TRIMANE Saint Germain en Laye – France @gmail.com RESUME : La transformation digitale des entreprises et plus largement celle de la société, entraine une évolution des bases de données vers le Big Data. Nos travaux s’inscrivent dans cette mutation et conce...

Data warehouse (DW) is a large, oriented-subject, non-volatile, and historical database, and an important component of Business Intelligence. On DW are executed OLAP (Online Analytical Processing) queries that often culminate in a high response time. Fragmentation of data, materialized views and indices aim to improve performance in processing these queries. Additionally, NoSQL (Not only SQL) d...

Today with the rapidly accumulated data, datadriven applications are emerging in science and commercial areas. On both HPC systems and clouds the continuously widening performance gap between storage and computing resource prevents us from building scalable data-intensive systems. Distributed NoSQL storage systems are known for their ease of use and attractive performance and are increasingly u...

NOSql database systems are extremely optimized for performing retrieval and adjoining operations on large quantity of data as compared to relational models which relatively inefficient. They used majorly real-time applications statistically analyzing the growing amount data. NoSQL databases emerging in market claim outperform SQL databases. In Present time technology, every person wants save se...

In this paper, we evaluate three types of embedded data storage models on mobile devices. SQLite is a relational database, CouchLite is a key-value NoSQL database and DbO4 is an object-oriented databases. Mobile phones are becoming powerful enough to do a large amount of processing without leveraging cloud services. Most mobile applications are data driven and their performance depends on data ...

Özet. Bu çalışmada, takip ve izleme sistemlerinde kullanılmak üzere geliştirilen iki farklı mimari alternatif karşılaştırılmıştır. Alternatiflerden birincisi, sütun bazlı dağıtık bir NoSQL sistemine dayanmaktadır. İkinci mimari alternatif ise, dağıtık kuyruk ve önbellek sistemleri ile ilişkisel bir veritabanı çözümünün birlikte kullanılmasına dayanmaktadır. Alternatif mimariler, bulut ortamında...

NoSQL document stores are becoming increasingly popular as backends in web development. Not only do they scale out to large volumes of data, many systems are even custom-tailored for this domain: NoSQL document stores like Google Cloud Datastore have been designed to support massively parallel reads, and even guarantee strong consistency in updating single data objects. However, strongly consis...

NoSQL data stores are widely used to store and retrieve possibly large amounts of data, typically in a key-value format. There are many NoSQL types with different performances, and thus it is important to compare them in terms of performance and verify how the performance is related to the database type. In this paper, we evaluate five most popular NoSQL databases: Cassandra, HBase, MongoDB, Or...

The need to store and manipulate large volume of (unstructured) data has led to the development of several NoSQL databases for better scalability. Graph databases are a particular kind of NoSQL databases that have proven their efficiency to store and query highly interconnected data, and have become a promising solution for multiple applications. While the mapping of conceptual schemas to relat...

This paper presents a survey on security and privacy issues in big data and NoSQL. Due to the high volume, velocity and variety of big data, security and privacy issues are different in such streaming data infrastructures with diverse data format. Therefore, traditional security models have difficulties in dealing with such large scale data. In this paper we present some security issues in big ...