Databases Questions and Answers - DoAnswers.com

A database is a collection of information that is organized so that it can easily be accessed, managed, and updated. In one view, databases can be classified according to types of content: bibliographic, full-text, numeric, and images. In computing, databases are sometimes classified according to their organizational approach. The most prevalent approach is the relational database, a tabular database in which data is defined so that it can be reorganized and accessed in a number of different ways. A distributed database is one that can be dispersed or replicated among different points in a network. An object-oriented programming database is one that is congruent with the data defined in object classes and subclasses. A database is a collection of information that is organized so that it can easily be accessed, managed, and updated. In one view, databases can be classified according to types of content: bibliographic, full-text, numeric, and images. The term database originated within the computer industry, though its meaning has been broadened by popular use, such that the European Database Directive (which creates intellectual property rights for databases) includes non-electronic databases within its definition. This article is confined to a more technical use of the term; though even amongst computing professionals, some attach a much wider meaning to the word than others. A possible definition is that a database is a collection of records stored in a computer in a systematic way, so that a computer program can consult it to answer questions. For better retrieval and sorting, each record is usually organized as a set of data elements (facts). The items retrieved in answer to queries become information that can be used to make decisions. The computer program used to manage and query a database is known as a database management system (DBMS). The properties and design of database systems are included in the study of information science.

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DB2 Interview Questions and Answers

DB2 is the database management system that delivers a flexible and cost-effective database platform to build robust on demand business applications. DB2 further leverages your resources with broad support for open standards and popular development platforms like J2EE and Microsoft .NET. The DB2 family also includes solutions tailored for specific needs like business intelligence and advanced tooling. Whether your business is large or small, DB2 has a solution built and priced to meet your unique needs.

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IMS Interview Questions and Answers

Information Management System. Composed of two systems: a Database Manager (IMS DB) and a Transaction Manager (IMS TM). IMS DB: Information Management System Database Manager. IBM�s venerable (introduced in 1968) large system hierarchical DBMS. In casual conversation, either IMS1 DB or IMS TM may be referred to simply as IMS without anyone complaining. Following the introduction of DB2, it was assumed, both inside and outside IBM, that IMS DB would die a slow death as DB2�s performance improved to approach that of IMS DB. But, it never happened, mainly because of the number of major IMS-based applications at large organizations worldwide. Once IBM realized this, a major effort was made to keep both IMS DB and IMS TM up to date with the latest trends, such as Web enablement, though nobody proposed making it into a relational DBMS

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MYSQL Interview Questions and Answers

MySQL (pronounced "my ess cue el") is an open source relational database management system (RDBMS) that uses Structured Query Language (SQL), the most popular language for adding, accessing, and processing data in a database. Because it is open source, anyone can download MySQL and tailor it to their needs in accordance with the general public license. MySQL is noted mainly for its speed, reliability, and flexibility

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Oracle Interview Questions and Answers

The First Database Designed for Grid Computing Oracle Database 10g delivers record-breaking performance and scalability on Windows, Linux, and UNIX servers and provides fast ROI by moving from a single server to Grid Computing without changing a single line of code. Oracle Database 10g delivers better results by automating administrative tasks, providing industry-leading security and regulatory compliance features, and enabling the highest availability with Real Application Clusters. With a range of editions and lower operating cost versus IBM DB2 and Microsoft SQL Server, it's the ideal choice for large enterprises and small and medium businesses alike. Compare editions to find the one that's right for you.

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PL/SQL Interview Questions And Answers

PL/SQL (Procedural Language/Structured Query Language) is Oracle Corporation's proprietary procedural extension to the SQL database language, used in the Oracle database. Some other SQL database management systems offer similar extensions to the SQL language. PL/SQL's syntax strongly resembles that of Ada, and just like Ada compilers of the 1980s the PL/SQL runtime system uses Diana as intermediate representation.

The key strength of PL/SQL is its tight integration with the Oracle database.

PL/SQL is one of three languages embedded in the Oracle Database, the other two being SQL and Java.

Quel Interview Questions and Answers

QUEL is a relational database access language, similar in most ways to SQL, but somewhat better arranged and easier to use. It was created as a part of the groundbreaking Ingres effort at University of California, Berkeley, based on Codd's earlier suggested but not implemented Data Sub-Language ALPHA. QUEL was used for a short time in most products based on the freely-available Ingres source code, most notably Informix. As Oracle and DB2 started taking over the market in the early 1980s, most companies then supporting QUEL moved to SQL instead. In many ways QUEL is similar to SQL. One difference is that QUEL statements are always defined by tuple variables, which can be used to limit queries or return result sets.

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SQL Interview Questions and Answers

Structured Query Language (SQL), pronounced "sequel", is a language that provides an interface to relational database systems. It was developed by IBM in the 1970s for use in System R. SQL is a de facto standard, as well as an ISO and ANSI standard

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