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An Efficient Flash Memory B-Tree Supporting Very Cheap Node Updates

플래시 메모리 B-트리를 위한 저비용 노드 갱신 기법

  • 임성채 (동덕여자대학교 컴퓨터학과)
  • Received : 2016.06.23
  • Accepted : 2016.07.13
  • Published : 2016.08.28

Abstract

Because of efficient space utilization and fast key search times, B-trees have been widely accepted for the use of indexes in HDD-based DBMSs. However, when the B-ree is stored in flash memory, its costly operations of node updates may impair the performance of a DBMS. This is because the random updates in B-tree's leaf nodes could tremendously enlarge I/O costs for the garbage collecting actions of flash storage. To solve the problem, we make all the parents of leaf nodes the virtual nodes, which are not stored physically. Rather than, those nodes are dynamically generated and buffered by referring to their child nodes, at their access times during key searching. By performing node updates and tree reconstruction within a single flash block, our proposed B-tree can reduce the I/O costs for garbage collection and update operations in flash. Moreover, our scheme provides the better performance of key searches, compared with earlier flash-based B-trees. Through a mathematical performance model, we verify the performance advantages of the proposed flash B-tree.

Keywords

B+-trees;Flash Memory;Indexing Schemes;Databases;Storage

Acknowledgement

Supported by : 동덕여자대학교

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