A study of space reclamation on flash-based append-only storage management

  • Authors:
  • Yulei Fan;Wei Cao;Xiaofeng Meng

  • Affiliations:
  • School of Information, Renmin University of China, Beijing, China;School of Information, Renmin University of China, Beijing, China;School of Information, Renmin University of China, Beijing, China

  • Venue:
  • DASFAA'12 Proceedings of the 17th international conference on Database Systems for Advanced Applications
  • Year:
  • 2012

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Abstract

Flash disks exhibit many different IO characteristics from magnetic disks. Flash-based databases should consider such traits of flash disks as faster access performance but discrepant between reads and writes, and between sequential and random accesses etc. To overcome the poor performance of random writes on flash memory, log-based and append-only storage management had been proposed by replacing random write with sequential write; this paper studies append-only storage management(ASM) with effective space reclamation methods, which work for both traditional relational database systems and key-value database systems built on flash devices. In this paper, we detail two kinds of record layouts used for space reclamation and then propose three space reclamation algorithms based on them. Our experiments show that the append-only storage management with bitmap index-based space reclamation algorithm(BI-ASM) has a factor of 32 of spatial improvement and factors from 23 to 44 of temporal improvement.