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Physical Data Model Options.[1]
A physical data model (or database design) is a representation of a data design as implemented, or intended to be implemented, in a database management system. In the lifecycle of a project it typically derives from a logical data model, though it may be reverse-engineered from a given database implementation. A complete physical data model will include all the database artifacts required to create relationships between tables or to achieve performance goals, such as indexes, constraint definitions, linking tables, partitioned tables or clusters. Analysts can usually use a physical data model to calculate storage estimates; it may include specific storage allocation details for a given database system.
As of 2012[update] seven main databases dominate the commercial marketplace: Informix, Oracle, Postgres, SQL Server, Sybase, IBM Db2 and MySQL. Other RDBMS systems tend either to be legacy databases or used within academia such as universities or further education colleges. Physical data models for each implementation would differ significantly, not least due to underlying operating-system requirements that may sit underneath them. For example: SQL Server runs only on Microsoft Windows operating-systems (Starting with SQL Server 2017, SQL Server runs on Linux. It's the same SQL Server database engine, with many similar features and services regardless of your operating system[2]), while Oracle and MySQL can run on Solaris, Linux and other UNIX-based operating-systems as well as on Windows. This means that the disk requirements, security requirements and many other aspects of a physical data model will be influenced by the RDBMS that a database administrator (or an organization) chooses to use.
^"FEA Consolidated Reference Model Document" (PDF). Office of Management and Budget. May 2005. p. 91. Archived from the original (PDF) on July 5, 2010 – via National Archives.
^rothja. "Overview of SQL Server on Linux - SQL Server". docs.microsoft.com. Retrieved 2019-04-28.
logical schema, however, still did not describe how physically data would be stored on disk drives. That is the domain of the physicalschema. Now logical...
tags. The logical schema and conceptual schema are sometimes implemented as one and the same. Physicalschema: describes the physical means used to store...
the conceptual schema can be changed without affecting the existing schemas. The physical structure of the data is referred to as "physical data description"...
case of the snowflake schema, and is more effective for handling simpler queries. The star schema gets its name from the physical model's resemblance to...
Schema therapy was developed by Jeffrey E. Young for use in treatment of personality disorders and chronic DSM Axis I disorders, such as when patients...
The database schema is the structure of a database described in a formal language supported typically by a relational database management system (RDBMS)...
A logical data model or logical schema is a data model of a specific problem domain expressed independently of a particular database management product...
describe the conceptual schema when a database system is implemented.[citation needed] It hides the internal details of physical storage and targets the...
retrieving it from the Orders table. The logical schema and its mapping with the physicalschema is represented as an Entity Data Model (EDM), specified...
maladaptive schemas, often called early maladaptive schemas, in schema therapy, a theory and method of psychotherapy. An early maladaptive schema is a pervasive...
The W3C's XML Schema Recommendation defines a formal mechanism for describing XML documents. The standard has become popular and is used by the majority...
Austrian ethologist Konrad Lorenz. Lorenz proposed the concept of baby schema (Kindchenschema), a set of facial and body features that make a creature...
introduced XML schemas into GML's structure to help connect the various existing geographic databases, whose relational structure XML schemas more easily...
partitioned into separate physicalschemas on either the same database server or different database servers. Snowflake schema "The Data Warehouse LifecycleToolkit"...
The 'Schema' partition defines object classes and attributes within the forest. The 'Configuration' partition contains information on the physical structure...
arbitrary data structures, such as those used in web services. Several schema systems exist to aid in the definition of XML-based languages, while programmers...
The attention schema theory (AST) of consciousness (or subjective awareness) is a neuroscientific and evolutionary theory of consciousness which was developed...
talk about them. The physicalschema describes the internal formats of the data stored in the database, and the external schema defines the view of the...
database with a schema flexible enough to allow customer extension of the built-in data types in ACcent without changes to the physicalschema. CaseWare Amplify...
available specification, ISO/PAS 17506. COLLADA defines an open standard XML schema for exchanging digital assets among various graphics software applications...
DIV-3 Physical Data Model The physical implementation format of the Logical Data Model entities, e.g., message formats, file structures, physicalschema. In...
Body schema is an organism's internal model of its own body, including the position of its limbs. The neurologist Sir Henry Head originally defined it...
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