| 摘要 |
Purpose: The purpose is to enable the non-disruptive insertion of columns, and like operations, into databases that remain in operation, guarantee that programs using old database definition sets are able to run, and automate the creation and modification of database definition sets. Constitution: A database system comprising a logical structure conversion component that, in a database system that stores and retrieves data, converts records defined by some given version of a database definition set to records defined by a different version of the database definition set and a data storage component that stores multiple versions of the database definition paired to the records of one given table and multiple versions of the records defined by those database definition sets.
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