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Snapshot Differential Algorithm Based on a MD5 Variant

Author: TangXiangYang
Tutor: PanJiuHui
School: Jinan University
Course: Computer System Architecture
Keywords: Snapshot differential Incremental detection MD5 Sort Merge Summary
CLC: TP311.13
Type: Master's thesis
Year: 2011
Downloads: 24
Quote: 0
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Abstract


With the rapid development of computer technology , human society, the level of information technology is constantly advancing , the digitization of the amount of information showing the geometric growth trend . Integration and effective use of this information , will greatly improve production efficiency and thus bring great benefits to society . Data integration the most basic and the first stage is incremental detection to get incremental data , the criteria is to see the cost and efficiency of the detection . Should demand a lot of incremental detection methods , such as triggers , log analysis . Versatility and simplicity to occupy a place snapshot differential algorithm is a simple comparison of the data source time snapshot to achieve detection incremental data . Snapshot differential algorithm , occupies an irreplaceable position in the various incremental detection method snapshot differential algorithm because of its versatility and portability . First to introduce the traditional the Sort Merge snapshot differential algorithm based on , at the expense of multiple disk IO problems in comparison to the large amount of data snapshot files . Order to reduce disk IO , presented a summary of the tuple ways to reduce backup snapshot file size . Proven effective summary SortMerge algorithm reduces the computing process involved the amount of disk IO , so that the efficiency of the algorithm has been greatly improved. The digest algorithm selection are critically important for the implementation of the entire algorithm performance , this paper re- digest algorithm selection and improved some research . Finally, select MD5 digest algorithm is widely used , simplified and streamlined algorithm was validated by them to reduce the number of cyclic heavy . Finally, use the MD5 algorithm simplified form based to simplify of MD5 SortMerge algorithm , compared the original snapshot differential algorithm based on the original MD5 SortMerge efficiency greatly improved .

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer software > Program design,software engineering > Programming > Database theory and systems
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