Incremental reorganization of relational databases

<span title="">1988</span> <i title="Elsevier BV"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/md2ierut4nak5ociupgnvel2oa" style="color: black;">Decision Support Systems</a> </i> &nbsp;
The evolution of an information system is reflected in Abstract data modeling by database reorganization. Entity-Relationship consistency expresses the capability of relational databases to model information oriented systems. A relational schema consisting of &ation schemes. together with key and inclusion dependencies, is said to be ER-consistent if it complies with an entity-relationship structure, meaning that it is representable by an ER-Diagram. For ERconsistent schemas the basic
more &raquo; ... ing manipulations are the addition and removal of relation schemes, coupled with the modification of the key and inclusion dependencies. Recently we have defined a set of incremental and reversible schema restructuring manipulations as the translatea of a set of vertex-oriented ER-Diagram transformations. For non-empty database states the schema restructuring manipulations must be associated with state mappings, and this leads us to the definition of database reorganization operations; database reorganization operations consist of compatible pairs of incremental restructuring manipulations and entitj4ounded state mappings. For the specification of ER-consistent database state mappings, we propose an Entity-Relationship Calculus.
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