Schema versioning for multitemporal relational databases
Information Systems
The TSQL2 Temporal Query Language
The TSQL2 Temporal Query Language
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The VLDB Journal — The International Journal on Very Large Data Bases
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The VLDB Journal — The International Journal on Very Large Data Bases
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Proceedings of the VLDB Endowment
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Graceful database schema evolution: the PRISM workbench
Proceedings of the VLDB Endowment
Managing and querying transaction-time databases under schema evolution
Proceedings of the VLDB Endowment
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Automating the database schema evolution process
The VLDB Journal — The International Journal on Very Large Data Bases
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Modern information systems, and web information systems in particular, are faced with frequent database schema changes, which generate the necessity to manage them and preserve the schema evolution history. In this paper, we describe the Panta Rhei Frameworkdesigned to provide powerful tools that: (i) facilitate schema evolution and guide the Database Administrator in planning and evaluating changes, (ii) support automatic rewriting of legacy queries against the current schema version, (iii) enable efficient archiving of the histories of data and metadata, and (iv) support complex temporal queries over such histories. We then introduce the Historical Metadata Manager (HMM), a tool designed to facilitate the process of documenting and querying the schema evolution itself. We use the schema history of the Wikipedia database as a telling example of the many uses and benefits of HMM.