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A Flash Memory B+-Tree for Efficient Range Searches

효율적 범위 검색을 위한 플래시 메모리 기반 B+-트리

  • 임성채 (동덕여자대학교 컴퓨터학과) ;
  • 박창섭 (동덕여자대학교 컴퓨터학과)
  • Received : 2013.07.08
  • Accepted : 2013.07.25
  • Published : 2013.09.28

Abstract

During the past decades, the B+-tree has been most widely used as an index file structure for disk-resident databases. For the disk based B+-tree, a node update can be cheaply performed just by modifying its associated disk page in place. However, in case that the B+-tree is stored on flash memory, the traditional algorithms of the B+-tree come to be useless due to the prohibitive cost of in-place updates on flash memory. For this reason, the earlier schemes for flash memory B+-trees usually take an approach that saves B+-tree changes from real-time updates into extra temporary storage. Although that approach can easily prevent frequent in-place updates in the B+-tree, it can suffer from a waste of storage space and prolonged search times. Particularly, it is not allowable to process range searches on the leaf node level. To resolve such problems, we devise a new scheme in which the leaf nodes and their parent node are stored together in a single flash block, called the p-node block.

Keywords

B+-tree;Flash Memory;Range Searches;Garbage Collection

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