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The germplasm of the genus Nicotiana contains more than 5,000 accessions and plays an important role in modern biological research. Tobacco can be used as a model system to develop methodologies for plant transformation and for investigating gene function. In order to develop the study of Nicotiana, a large quantity of data on germplasm, sequences, molecular markers and genetically modified tobacco...
Concurrency control mechanism can largely use the system resources; it develop the advantage of the database resource sharing and is one of the important indicator to measure the performance of the database management system(DBMS). There are many existing types of concurrency control algorithms. This paper introduces the concurrency control of the Multi - version Timestamp protocol and optimizes its...
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