ArtsAutosBooksBusinessEducationEntertainmentFamilyFashionFoodGamesGenderHealthHolidaysHomeHubPagesPersonal FinancePetsPoliticsReligionSportsTechnologyTravel

What Are Databases? An Overview

Updated on January 9, 2018
tamarawilhite profile image

Tamara Wilhite is a technical writer, industrial engineer, mother of 2, and a published sci-fi and horror author.

What Is A Database?

Databases store information called data in tables. The columns of the tables hold rows of data. Columns may be called "name", "account number" or "dollar amount". Rows contain information such as the name, account number and total amount spent by a customer on a single transaction.

Programs or stored procedures access the information, manipulate it or use it to perform calculations. Indexes help increase the speed of data retrieval. A database view is a designed presentation of the data in the database. Functions are tasks that can be performed on one or many database rows. Database queries are searches of the information within the database.

Equations like this are used by analytical databases to transform data points into related values such as estimating position in time between data collection intervals.
Equations like this are used by analytical databases to transform data points into related values such as estimating position in time between data collection intervals. | Source

Types of Databases

Databases are either transactional or analytical. Transactional databases are used to record transactions such as financial transactions during the buying and selling of items. Analytical databases hold volumes of data and perform complex data analysis, such as analyzing many pieces of weather data to create a weather map or reviewing elevation data to create a geographic information system map showing the locations of all pipes and their depths within a given area.


Database designs are object oriented, relational or a hybrid of the two. Relational databases are based on relations between other rows and columns in the database. An item database listing the items available in an online video game containing a list of their attributes along with instructions on how to get them is a common type of relational database.


The combinations of information such as someone's name, address and account number create a tuple or collection of attributes across the database that represent a single entity or person. The relationship between database tables and database objects are called the schema.


Object oriented databases use objects for data presentation and data management. Object oriented databases are intended to create a data representation such as a single individual, holding more information than can be held within a tuple.


Objects in an object oriented database can hold attribute information such as a person's pictures or preferences, more than simply a height, weight and other numeric information. A hybrid between these two models is called an object-relational database management system.

Database Schemas

Database schemas determine how the data is structured or organized.

In relational databases, data is organized into tables. XML organizes data into a hierarchy. Object oriented databases store the data in a series of objects. The graph schema allows the data to be linked to other data items in a structure similar to a spider web. Graph schemas are used with object oriented databases.

Database Languages

SQL, the abbreviation for Structured Query Language, is a relational database language developed by IBM and can be found on MySQL database servers. Object oriented databases are generally written in object oriented programming languages. These include but are not to Java and C++.

Query Management Facility or QMF is used for data mining on mainframes and report generation. OPAL is an object oriented programming language.

Database Applications

Oracle is one of the most commonly used database software applications. Another one is Microsoft Access. IBM's Informix Dynamic Server is long standing database application. PowerPlay is a data management software using OLAP for data analysis. QueryEdge is a business intelligence / query tool.

Open DataBase Connectivity or ODBC is an application programming interface that links software applications to an SQL database. Java DB is an open-source relational database offered by Apache. Other database applications exist, as well as middleware software applications to link databases to other software tools, perform data analysis, generate reports to link databases to web pages.

The Job of Database Administrators

Database administrators or DBAs have the authority to create new databases, copy databases or modify the structure of existing databases. Database administrators apply security controls on a database, such as limiting the ability to edit data or copy the entire database. The DBA may have the job of auditing user access logs for potential security violations.

Database managers generally do not enter data into the database; this is done by users. Data managers may have the responsibility of ensuring data quality, training new database users and submitting requests for new database user set ups to the database administrator.

Database Terminology

A DBMS is a database management system. An ODBMS is an object oriented database management system. Database Manipulation Language or DML is used in SQL to modify data within a database. Unique identifiers are a unique identification number or code assigned to each database record.

Metadata refers to the information that describes a database record. In a drawing database, the metadata includes the drawing number, drawing revision letter, the drafter and owning project. The metadata record is linked to the database record but is separate from the drawing file itself.

CRM databases or customer relationship management databases store information on potential customers and current customers. CRM databases can also hold attempts by sales people to contact clients, sales figures for different personnel and customer surveys. OLAP stands for OnLine Analytical Processing.

Comments

Submit a Comment

No comments yet.

working

This website uses cookies

As a user in the EEA, your approval is needed on a few things. To provide a better website experience, hubpages.com uses cookies (and other similar technologies) and may collect, process, and share personal data. Please choose which areas of our service you consent to our doing so.

For more information on managing or withdrawing consents and how we handle data, visit our Privacy Policy at: https://hubpages.com/privacy-policy#gdpr

Show Details
Necessary
HubPages Device IDThis is used to identify particular browsers or devices when the access the service, and is used for security reasons.
LoginThis is necessary to sign in to the HubPages Service.
Google RecaptchaThis is used to prevent bots and spam. (Privacy Policy)
AkismetThis is used to detect comment spam. (Privacy Policy)
HubPages Google AnalyticsThis is used to provide data on traffic to our website, all personally identifyable data is anonymized. (Privacy Policy)
HubPages Traffic PixelThis is used to collect data on traffic to articles and other pages on our site. Unless you are signed in to a HubPages account, all personally identifiable information is anonymized.
Amazon Web ServicesThis is a cloud services platform that we used to host our service. (Privacy Policy)
CloudflareThis is a cloud CDN service that we use to efficiently deliver files required for our service to operate such as javascript, cascading style sheets, images, and videos. (Privacy Policy)
Google Hosted LibrariesJavascript software libraries such as jQuery are loaded at endpoints on the googleapis.com or gstatic.com domains, for performance and efficiency reasons. (Privacy Policy)
Features
Google Custom SearchThis is feature allows you to search the site. (Privacy Policy)
Google MapsSome articles have Google Maps embedded in them. (Privacy Policy)
Google ChartsThis is used to display charts and graphs on articles and the author center. (Privacy Policy)
Google AdSense Host APIThis service allows you to sign up for or associate a Google AdSense account with HubPages, so that you can earn money from ads on your articles. No data is shared unless you engage with this feature. (Privacy Policy)
Google YouTubeSome articles have YouTube videos embedded in them. (Privacy Policy)
VimeoSome articles have Vimeo videos embedded in them. (Privacy Policy)
PaypalThis is used for a registered author who enrolls in the HubPages Earnings program and requests to be paid via PayPal. No data is shared with Paypal unless you engage with this feature. (Privacy Policy)
Facebook LoginYou can use this to streamline signing up for, or signing in to your Hubpages account. No data is shared with Facebook unless you engage with this feature. (Privacy Policy)
MavenThis supports the Maven widget and search functionality. (Privacy Policy)
Marketing
Google AdSenseThis is an ad network. (Privacy Policy)
Google DoubleClickGoogle provides ad serving technology and runs an ad network. (Privacy Policy)
Index ExchangeThis is an ad network. (Privacy Policy)
SovrnThis is an ad network. (Privacy Policy)
Facebook AdsThis is an ad network. (Privacy Policy)
Amazon Unified Ad MarketplaceThis is an ad network. (Privacy Policy)
AppNexusThis is an ad network. (Privacy Policy)
OpenxThis is an ad network. (Privacy Policy)
Rubicon ProjectThis is an ad network. (Privacy Policy)
TripleLiftThis is an ad network. (Privacy Policy)
Say MediaWe partner with Say Media to deliver ad campaigns on our sites. (Privacy Policy)
Remarketing PixelsWe may use remarketing pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to advertise the HubPages Service to people that have visited our sites.
Conversion Tracking PixelsWe may use conversion tracking pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to identify when an advertisement has successfully resulted in the desired action, such as signing up for the HubPages Service or publishing an article on the HubPages Service.
Statistics
Author Google AnalyticsThis is used to provide traffic data and reports to the authors of articles on the HubPages Service. (Privacy Policy)
ComscoreComScore is a media measurement and analytics company providing marketing data and analytics to enterprises, media and advertising agencies, and publishers. Non-consent will result in ComScore only processing obfuscated personal data. (Privacy Policy)
Amazon Tracking PixelSome articles display amazon products as part of the Amazon Affiliate program, this pixel provides traffic statistics for those products (Privacy Policy)