Gravitating to rigidity: Patterns of schema evolution - and its absence - in the lives of tables
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- 作者：Panos Vassiliadisa ; pvassil@cs.uoi.gr" class="auth_mail" title="E-mail the corresponding author ; Apostolos V. Zarrasa ; zarras@cs.uoi.gr" class="auth_mail" title="E-mail the corresponding author ; Ioannis Skoulisb ; 1 ; giskou@gmail.com" class="auth_mail" title="E-mail the corresponding author
- 关键词：Schema evolution ; Database evolution ; Analysis of evolution history ; Patterns in schema evolution ; Software rigidity ; Software repository mining ; Exploratory study ; Software maintenance
- 刊名：Information Systems
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：63
- 期：Complete
- 页码：24-46
- 全文大小：4983 K
文摘
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We highlight patterns of table evolution for databases within open source software.
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Γ pattern: tables with large schemata tend to have long durations and survive.
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Comet pattern: the tables with most updates often are of medium schema size.
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Inverse Γ pattern: most tables change disproportionately lower wrt their duration.
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Empty Triangle pattern: deleted tables are mostly early born, short lived & quiet.
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Gravitation to rigidity: databases are much more prone to rigidity than evolution.