Database Models in DBMS

Data Models

Database is made in 1960, is triggered when the need for a system management information flexible. The data model is a set of terms that are used for the database structure can be described. An image or a data model describes how data should be prepared to serve a particular purpose. The data model represents the data elements required, and the data should look like. However, it is misleading to discuss data models, as if the data type of the model, and equally wrong to speak of him, as if used for a purpose.

There are three different types of models and advanced data generated for the purpose of the database to the information system itself. The data must be identified first as a conceptual data model can be essentially a set of technical specifications and independent data are used to discuss the initial needs of the stakeholders of the company.

Data modeling techniques are used :-

• To control data as a resource ( migrate, merge, data quality).
• For designing computer databases.
• To better cope with modify, by allowing to make changes into the model, that will automatically make changes in the database and programs.

Data models can be broadly illustrious into 3 main categories:-

1) High-level or Conceptual Data Models : It provides idea that are close to the way many users recognize data.

2) Low Level or Physical Data Models:- It provides idea that explain the details of how data is stored in the computer.

3) Representational or Implementation Data Models: It provides idea that can be understand by end users. These hide some facts of data storage but can be implemented on a computer system directly.

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About Structured Query Language (SQL)

SQL

Structured Query Language (SQL) is a commonly used programming language for effective with relational databases. As its full name (Structured Query Language) shows, SQL is liable for querying and editing information stored in a convinced database management system. Though the SQL comes in lots of flavors, for example besides the standard SQL syntax, the Oracle databases also operate their proprietary PL/SQL, similarly Microsoft SQL Server operate their Transact-SQL. All of these variations, through proprietary, are stand upon the industry standard ANSI SQL.

Therefore, SQL is considered to be planned at a higher conceptual level of operation than procedural languages because the lower level logical and physical operations are not particular and are determined by the SQL engine or server process that complete it. The SQL UPDATE command is used to make modification to existing database tables and records. All the required Structured Query Language commands in a related RDBMS can typically be executed during an SQL command line interface (CLI).

Database Models :- 

A data model comprises

1. A data structure
2. A set of integrity constraints
3. Operations related with the data structure

Examples of data models include :-

1. hierarchic
2. network
3. relational

What Can SQL do?

1. SQL can retrieve data from a database
2. SQL can update records in a database
3. SQL can create new databases
4. SQL can create views in a database

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Relational Database Management System (RDBMS)

RDBMS

Combine separate files related (tables) of a series is maintained, but the elements of database queries and reports, data files, if necessary. concept Edgar Codd in 1970, was selected for a user to adapt to ad hoc data. The majority of companies in the management system database (DBMS), Oracle, DB2, SQL Server, MySQL, etc., related to a DBMS (RDBMS) is (see DBMS), including. Applications of modern databases and commercial open-source relational in nature. The main features of relational database tables to store data in a way that can be used, and maintain, however, some data Relationships.

Universal report: -

The report is, essentially, a universal condition, and he said It is possible, a large table, while the data store. In a sense, a universal relation, "before" fully normalized relational schema. It is also assumed that the semantic attributes of the various reports in the same way. As a result, many Columns can be NULL. But the thought experiment, which is perfectly fine.

Associations: -

Interviews in some local or remote communities are usually instances of SQL CONNECT, the display server. The current MIB does not reveal there are individual companies, the union and the board of Apple dbmsSvrInfoTable counters. There are also connections between servers and databases. obvious Possible relations and media.

. A database: 1 Server
. A database: the number of servers
. Many database: 1 Server
. Many database server

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XML (Extensible Markup Language)

• Definite by the WWW Consortium (W3C)
• Initially intended as a document markup language not a database language
• The ability to denote new tags and to produce nested tag structures made XML a immense way to switch data, not just documents
• XML has grown to be the basis for all innovative generation data interchange formats.
• A wide diversity of tools is existing for parsing, browsing and querying XML documents/data

Database Administrator

Synchronize all the actions of the database system; the database administrator has a superior considerate of the enterprise’s information resources and requirements.

Database administrator's responsibilities include:-

1. Schema definition
2. Storage structure and admittance method explanation
3. Schema and physical organization alteration
4. Yielding user authority to admittance the database
5. Denote integrity constraints
6. Acting as liaison with users
7. Watch out performance and responding to alter in requirements

Database Users

Users are distinguished by the way they expect to interrelate with the system.

• Application programmers – interrelate with system all the way through DML calls
• Sophisticated users – form requests in a database query language
• Specialized users – write dedicated database applications that do not fit into the traditional data processing framework
• Naive users – appeal to one of the permanent application programs that have been written formerly

Examples, people accessing database in excess of the web, bank tellers, clerical staff

Database Architecture

The architecture of database systems is greatly prejudiced by the underlying computer system on which the database is running:

• Centralized
• Client-Server
• Parallel (Multiprocessor)
• Distributed