WattDB – An Energy-proportional DBMS

Volker Höfner, Daniel Schall

Databases and Information Systems GroupUniversity of Kaiserslautern, Germany

Motivation

• Energy proportionality is the key to energy-efficient systems

• Energy efficiency as a first class citizen in DBMS

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WattDBStandard server

System load [Percent]

Power [Watt]

Vision

• DBMS balances power consumption proportionally to system load

Load

Time

Overview

• Distributed database system• Light-weighted nodes, low-power hardware– Intel Atom, mobile hard drives, 1Gbit-Ethernet

• Physical Shared-Disk, logical Shared-Nothing• Two types of nodes– without external storage– with hard disks attached

Quests

• Policies for powering up / down nodes• Load distribution and balancing among nodes• Which use cases fit for the proposed

architecture, which don‘t?• Alternative hardware configurations– Heterogeneous HW environment– SSDs, other CPUs, GPUs(?)

• Energy-efficient self-tuning