The performance of parallel query processing in a cluster of index servers is crucial for
modern web search systems. In such a scenario, the response time basically depends on …

Vertical search engines focus on specific slices of content, such as the Web of a single
country or the document collection of a large corporation. Despite this, like general open …

Previous work on workload characterization for Web search systems mainly focuses on the
characterization of user search behavior [4, 7]. In this paper, however, we model workloads …

Term-partitioning is an efficient way to distribute a large inverted index. Two fundamentally
different query processing approaches are pipelined and non-pipelined. While the pipelined …

This paper presents an evaluation of three partitioning methods for distributed inverted
indexes: local, global and hybrid indexing, combined with two generalized query models …

Commercial web search engines adopt parallel and replicated architecture in order to
support high query throughput. In this paper, we investigate the effect of caching on the …

Web search engines have to deal with a rapidly increasing amount of information, high
query loads and tight performance constraints. The success of a search engine depends on …

Los motores de búsqueda procesan enormes cantidades de datos (páginas web)
paraconstruir estructuras sofisticadas que soportan la búsqueda. La cantidad cada vez …

The importance and size of Web search engines is increasing daily. Information retrieval
systems based on a single centralized index present several problems, which lead to the …

This article presents a summary of the main activities of the Database & Information Systems
Research Group at Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio) and the …