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Chapter and Conference Paper
Towards Testing ACID Compliance in the LDBC Social Network Benchmark
Verifying ACID compliance is an essential part of database benchmarking, because the integrity of performance results can be undermined as the performance benefits of operating with weaker safety guarantees (a...
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Article
Open AccessMake the most out of your SIMD investments: counter control flow divergence in compiled query pipelines
Increasing single instruction multiple data (SIMD) capabilities in modern hardware allows for the compilation of data-parallel query pipelines. This means GPU-alike challenges arise: control flow divergence cause...
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Article
Special issue on best papers of VLDB 2017
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Chapter and Conference Paper
Role of the TPC in the Cloud Age
In recent year the TPC Technology Conference on Performance Evaluation and Benchmarking (TPCTC) series have had significant influence in defining industry standards. The 11th TPC Technology Conference on Perfo...
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Chapter and Conference Paper
Extracting Novel Facts from Tables for Knowledge Graph Completion
We propose a new end-to-end method for extending a Knowledge Graph (KG) from tables. Existing techniques tend to interpret tables by focusing on information that is already in the KG, and therefore tend to ext...
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Article
Query optimization through the looking glass, and what we found running the Join Order Benchmark
Finding a good join order is crucial for query performance. In this paper, we introduce the Join Order Benchmark that works on real-life data riddled with correlations and introduces 113 complex join queries. ...
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Reference Work Entry In depth
Main Memory DBMS
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Reference Work Entry In depth
Disk
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Reference Work Entry In depth
Processor Cache
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Reference Work Entry In depth
Main Memory
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Chapter and Conference Paper
JCC-H: Adding Join Crossing Correlations with Skew to TPC-H
We introduce JCC-H, a drop-in replacement for the data and query generator of TPC-H, that introduces Join-Crossing-Correlations (JCC) and skew into its dataset and query workload. These correlations are carefu...
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Article
Special Issue: Modern Hardware
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Article
Bitwise dimensional co-clustering for analytical workloads
Analytical workloads in data warehouses often include heavy joins where queries involve multiple fact tables in addition to the typical star-patterns, dimensional grou** and selections. In this paper we prop...
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Living Reference Work Entry In depth
Disk
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Living Reference Work Entry In depth
Processor Cache
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Living Reference Work Entry In depth
Main Memory
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Living Reference Work Entry In depth
Main Memory DBMS
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Chapter and Conference Paper
Exploiting Emergent Schemas to Make RDF Systems More Efficient
We build on our earlier finding that more than 95 % of the triples in actual RDF triple graphs have a remarkably tabular structure, whose schema does not necessarily follow from explicit metadata such as ontol...
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Chapter and Conference Paper
Parameter Curation for Benchmark Queries
In this paper we consider the problem of generating parameters for benchmark queries so these have stable behavior despite being executed on datasets (real-world or synthetic) with skewed data distributions an...
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Chapter
Advances in Large-Scale RDF Data Management
One of the prime goals of the LOD2 project is improving the performance and scalability of RDF storage solutions so that the increasing amount of Linked Open Data (LOD) can be efficiently managed. Virtuoso has...
