Database Cracking: Fancy Scan, not Poor Man’s Sort!
Presented at the SIGMOD/DaMoN, Snowbird, Utah, USA
Database Cracking is an appealing approach to adaptive indexing: on every range-selection query, the data is partitioned using the supplied predicates as pivots. The core of database cracking is, thus, pivoted partitioning. While pivoted partitioning, like scanning, requires a single pass through the data it tends to have much higher costs due to lower CPU efficiency. In this paper, we conduct an in-depth study of the reasons for the low CPU efficiency of pivoted partitioning. Based on the findings, we develop an optimized version with significantly higher (single-threaded) CPU efficiency. We also develop a number of multi-threaded implementations that are effectively bound by memory bandwidth. Combining all of these optimizations we achieve an implementation that has costs close to or better than an ordinary scan on a variety of systems ranging from low-end (cheaper than $300) desktop machines to high-end (above $60,000) servers.
|Proceedings of the Tenth International Workshop on Data Management on New Hardware|
Pirk, H, Petraki, E, Idreos, S, Manegold, S, & Kersten, M.L. (2014). Database Cracking: Fancy Scan, not Poor Man’s Sort!. In Proceedings of the Tenth International Workshop on Data Management on New Hardware. ACM. doi:10.1145/2619228.2619232