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[DOC File]Ch1.oct96 - UH
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• Database contains a complex array of pointers that thread through a set of records. • Little scope for automated "query optimization" 7. Schemas versus Instances. Database Schema: The description of a database. Includes descriptions of the database structure and the constraints that should hold on the database.
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[DOC File]Chapter 1&2
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Schema Diagram: A diagrammatic display of (some aspects of) a database schema. Database Instance: The actual data stored in a database at a particular moment in time . Also called database state (or occurrence). The database schema changes very infrequently . The database state changes every time the database is updated . Schema is also called ...
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[DOCX File]Database Management Systems
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_____ The hierarchical model represents the database schema as a tree. _____ A relational model database is most closely related to mathematical set theory. _____ An object oriented database model has similarities to a network database model.
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[DOC File]Chapter 1
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( A database schema is a . precise description of the structure of information in a . database system. (eg) Figure 2.1 (p34) Schema diagram for a database ( It is specified during database design and it is not expected to change frequently. 2.2 Three-Schema Architecture and Data Independence - The three-schema architecture (: level of abstraction)
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[DOC File]Comparison of Traditional File-Based Approach and Database ...
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1. External view: This is a highest level of abstraction as seen by user. This level of abstraction describes only the part of entire database. It is based on the conceptual model, is the end user view of data environment. Each external view described by means of a schema called an external schema or …
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[DOCX File]Database Management Systems
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__T__ The hierarchical model represents the database schema as a tree. __ T __ A relational model database is most closely related to mathematical set theory. __ T __ An object oriented database model has similarities to a network database model.
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[DOC File]Introduction to Database Systems – Chapter 1
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A database “schema” in the ER Model can be represented pictorially using an ER diagrams. Entity: An entity is described (in DB) using a set of attributes. Entity Set: All entities in an entity set have the same set of attributes (unless ISA hierarchy applies) Each entity set has a key.
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[DOC File]CS 4/53005 Database System Design
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Database, Database Management System (DBMS) Schema, Instance. Levels of Abstraction – User, Logical, Physical. Two roles of DB language – Data Definition vs Data Manipulation. What are some of the problems that DBs are intended to solve? Data redundancy. Data inconsistency. Non …
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Database schema vs model