NDLI: On-line reorganization of sparsely-populated B+-trees

Content Provider	ACM Digital Library
Author	Salzberg, Betty Zou, Chendong
Abstract	In this paper, we present an efficient method to do online reorganization of sparsely-populated $B^{+}-trees.$ It reorganizes the leaves first, compacting in short operations groups of leaves with the same parent. After compacting, optionally, the new leaves may swap locations or be moved into empty pages so that they are in key order on the disk. After the leaves are reorganized, the method shrinks the tree by making a copy of the upper part of the tree while leaving the leaves in place. A new concurrency method is introduced so that only a minimum number of pages are locked during reorganization. During leaf reorganization, Forward Recovery is used to save all work already done while maintaining consistency after system crashes. A heuristic algorithm is developed to reduce the number of swaps needed during leaf reorganization, so that better concurrency and easier recovery can be achieved. A detailed description of switching from the old $B^{+}-tree$ to the new $B^{+}-tree$ is described for the first time.
Starting Page	115
Ending Page	124
Page Count	10
File Format	PDF
ISBN	0897917944
DOI	10.1145/233269.233325
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	1996-06-01
Publisher Place	New York
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article

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On-line reorganization of sparsely-populated B+-trees