PosDB: An Architecture Overview


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Abstract

PosDB is an engine of a disk-based column-store DBMS designed for processing OLAP queries in a shared nothing environment. It is written completely from scratch and aims to become a platform for studying the distributed query processing in column-stores. This paper presents the first comprehensive description of the system. The presentation begins with the history of column-stores in order to clarify the reasons of their success. Next, the creation of a new system is justified, and an overview of its architecture is given. Finally, all its components are described in detail. Currently, query execution in PosDB is based on the Volcano model with block-oriented processing and late materialization. Various physical operators have been developed for relational operations such as join, aggregation, and selection. Some auxiliary operators were developed to support intraquery parallelism and network communication. Data distribution is achieved using horizontal range partitioning and data replication. The current version of PosDB can execute all queries from the Star Schema Benchmark in both centralized and distributed environments.

About the authors

G. A. Chernishev

St. Petersburg State University; JetBrains Research

Author for correspondence.
Email: chernishev@gmail.com
Russian Federation, St. Petersburg; St. Petersburg

V. A. Galaktionov

St. Petersburg State University

Email: chernishev@gmail.com
Russian Federation, St. Petersburg

V. D. Grigorev

St. Petersburg State University

Email: chernishev@gmail.com
Russian Federation, St. Petersburg

E. S. Klyuchikov

St. Petersburg State University

Email: chernishev@gmail.com
Russian Federation, St. Petersburg

K. K. Smirnov

St. Petersburg State University

Email: chernishev@gmail.com
Russian Federation, St. Petersburg

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