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A collection program is a term that is typically used to encapsulate the constructs of an information style, collection Management program (DBMS) and collection.
A collection is an ordered pool of logically-related information. Details are saved within the information components of the collection. A DBMS is a selection of programs providing the screen between people and a collection or directories. A DBMS is a shell which encompasses a collection or series of directories and through which all communications take place with the collection. The communications specific for by most established DBMS fall into four main groups:
Data Definition. Identifying new information components for a collection, getting rid of information components from the collection, altering the structure of established information.
Data Maintenance. Getting new information into established information components, modernizing information in established information components, getting rid of information from established information components.
Data Collection. Querying established information by end-users and getting information for use by application programs.
Data Control. Creating and tracking people of the collection, reducing access to information in the collection and tracking the performance of directories.
Both a collection and its DBMS comply with the concepts of a particular information style. Details models include the ordered information style, the network information style, the relational information style and the object-oriented information style.
Concepts and architecture
Information models
The objective of a style is to offer a degree of abstraction (i.e. conceal details). The style is a set of principles that can be used to summarize the construction of a collection. The construction includes:
Information kinds and length
Relationships
Constraints
An information style often includes:
A set of businesses for retrievals & updates
A set of appropriate user-defined businesses that are allowed
Different designs have different targets.
The DBMS architecture
The construction will help obtain the essential features of a DBMS
Three of these essential features are:
Information independence
Many customer views
A directory to retail shop the meta-data that is available to both the customer and the DBMS
The objective of the construction used is to individual the customer programs and the actual database
Three-schema Architecture
Reminder: A schema is a information of the construction of the database
Inner degree has an interior schema Conceptual degree has a conceptual schema
Exterior degree usually has several external schemas
Be aware that each of these schemas are only points of data; the details really only prevails at the actual level.
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