Schema Integration Essay - 2227 Words

In literature there exist several definitions of Schema: â€Å"Schema integration is the process of merging autonomously developed DB schema into a unified, global schema to provide transparency through a unified view† [73]. â€Å"Schema integration is the process of identifying the components of a database which are related to one another, selecting the best representation for the global conceptual schema, and finally, integrating the components of each intermediate schema† [74]. 12.2. Why is Schema Integration Required? With respect to the web warehouse, schema integration is one of its important perspectives. There are heterogeneous sources of data in World Wide Web which vary in their schema configuration. Schemas from different†¦show more content†¦Pre-integration An analysis of local schemata is carried out. The analysis made governs the choice of schemas to be integrated and the order of integration. A number of schemas to be integrated at a time and the amount of designer interaction are also decided in this step [81]. 12.4.2. Schema Comparison/Matching This step involves identifying and analyzing inter-schema relationships by determining the correspondences between the schemas. Possible conflicts are also detected in this phase. 12.4.3. Schema Conforming In order to integrate schemas, the detected conflicts between them have to be resolved so that it was possible to merge them [81]. It implies modification of one or both schemas that will be integrated until each phenomenon in the Universe of the Discourse (UoD) reflects the same form in both schemas. 12.4.4. Schema Merging Schema merging results into a single global integrated schema by superimposing the local schemas. 12.5. Conflicts in Schema Integration Schema integration process may face certain conflicts. The system undergoing the integration process must be able to identify the arise conflicts. Some of the schema integrations conflicts are explained below: 12.5.1. Naming Conflict Different databases use different naming conventions. Naming conflicts occur due to the use of different names for the same attribute likeShow MoreRelatedDifference Between The Spatiality Of Position And Situation879 Words   |  4 Pagesway. We do not conceive of ourselves as a collection of closely spatially related organs but rather as a whole contributing to our body schema (PhP 100). Our body schema is a gradually developing psychological construct that helps us develop a summary of our experiences as a body including out movement as a whole and unifies us a being (PhP 100). The body schema that we develop plays into the spatiality of position and the spatiality of situation and how the body appears to us. 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