Treffer: Linked data performance in different databases : Comparison between SQL and NoSQL databases ; Prestanda med länkad data i olika databaser : Jämförelse mellan SQL och NoSQL databaser

Meepo AB was investigating the possibility of developing a social rating and recommendation service. In a recommendation service, the user ratings are collected in a database, this data is then used in recommendation algorithms to create individual user recommendations. The purpose of this study was to find out which demands are put on a DBMS, database management system, powering a recommendation service, what impact the NoSQL databases have on the performance of recommendation services compared to traditional relational databases, and which DBMS is most suited for storing the data needed to host a recommendation service. Five distinct NoSQL and Relational DBMS were examined, from these three candidates were chosen for a closer comparison. Following a study of recommendation algorithms and services, a test suite was created to compare DBMS performance in different areas using a data set of 100 million ratings. The results show that MongoDB had the best performance in most use cases, while Neo4j and MySQL struggled with queries spanning the whole data set. This paper however never compared performance for real production code. To get a better comparison, more research is needed. We recommend new performance tests for MongoDB and Neo4j using implementations of recommendation algorithms, a larger data set, and more powerful hardware. ; Meepo AB undersökte möjligheten att utveckla en social betygs- och rekommendationstjänst. I en rekommendationstjänst samlas användarbetyg i en databas, för att sedan användas i en rekommendationsalgoritm för att skapa individuella rekommendationer till användarna. Syftet med studien var att ta reda på vilka krav som ställs på ett DBMS, databassystem, som driver en rekommendationstjänst, vilken inverkan NoSQL-databaser har på prestandan för rekommendationstjänster jämfört med traditionella relationsdatabaser och vilket DBMS som är mest lämpat för användning i en rekommendation tjänst. Fem olika NoSQL- och Relationsdatabaser undersöktes, från dessa valdes tre kandidater ut för en ...