database design

Database Database design and modeling 1 The first task of a database designer is to produce a conceptual data model that reflects the structure of the information to be held in the database

Database Database design and modeling 1 This process is often called logical database design, and the output is a logical data model expressed in the form of a schema

Database Database design and modeling 1 The most popular database model for general-purpose databases is the relational model, or more precisely, the relational model as represented by the SQL language. The process of creating a logical database design using this model uses a methodical approach known as normalization. The goal of normalization is to ensure that each elementary "fact" is only recorded in one place, so that insertions, updates, and deletions automatically maintain consistency.

Database Database design and modeling 1 This is often called physical database design

Database Database design and modeling 1 Another aspect of physical database design is security. It involves both defining access control to database objects as well as defining security levels and methods for the data itself.

Database management system - Database design and modeling 1 This process is often called logical database design, and the output is a logical data model expressed in the form of a schema

Database design 1 'Database design' is the process of producing a detailed data model of a database. This logical data model contains all the needed logical and physical design choices and physical storage parameters needed to generate a design in a Data Definition Language, which can then be used to create a database. A fully attributed data model contains detailed attributes for each entity.

Database design 1 However, the term database design could also be used to apply to the overall process of designing, not just the base data structures, but also the forms and queries used as part of the overall database application within the database management system (DBMS).Gehani, N

Database design 1 The process of doing database design generally consists of a number of steps which will be carried out by the database designer. Usually, the designer must:

Database design 1 *Superimpose a logical structure upon the data on the basis of these relationships.Teorey, T.J., Lightstone, S.S., et al., (2009). Database Design: Know it all.1st ed. Burlington, MA.: Morgan Kaufmann Publishers

Database design - ER diagram (entity-relationship model) 1 Database designs also include ER (Entity- relationship model) diagrams. An ER diagram is a diagram that helps to design databases in an efficient way.

Database design - Determining data to be stored 1 In a majority of cases, a person who is doing the design of a database is a person with expertise in the area of database design, rather than expertise in the domain from which the data to be stored is drawn e.g. financial information, biological information etc. Therefore the data to be stored in the database must be determined in cooperation with a person who does have expertise in that domain, and who is aware of what data must be stored within the system.

Database design - Determining data to be stored 1 This process is one which is generally considered part of requirements analysis, and requires skill on the part of the database designer to elicit the needed information from those with the domain knowledge

Database design - Normalization 1 In the field of relational database design, 'normalization' is a systematic way of ensuring that a database structure is suitable for general-purpose querying and free of certain undesirable characteristics—insertion, update, and deletion anomalies—that could lead to a loss of data integrity.

Database design - Normalization 1 A standard piece of database design guidance is that the designer should create a fully normalized design; selective denormalization can subsequently be performed, but only for computer performance|performance reasons. However, some modeling disciplines, such as the dimensional modeling approach to data warehouse design, explicitly recommend non-normalized designs, i.e. designs that in large part do not adhere to 3NF.

Database design - Conceptual schema 1 Once a database designer is aware of the data which is to be stored within the database, they must then determine where dependency is within the data

IDEF1X - Logical Database Design Technique 1 LDDT combined elements of the relational data model, the E-R model, and data generalization in a way specifically intended to support data modeling and the transformation of the data models into database designs.

IDEF1X - Logical Database Design Technique 1 Later models were transformed into database designs for Cullinet's network database, IDMS, and many varieties of relational database

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