Essay On Database System

According to Robert Primer, the term structured data is generally applied to database while the unstructured data is applied to everything else. Mostly, the unstructured data is related to information that is not to be in column-row database and not to be stored in database. This type of data often including the text and multimedia such as email, video, audio file and photo. Nowadays, there are lots of company that use the unstructured data as it helps the company to manage their storage space including software and hardware efficiently.

Technology Changes Role of Database Administrator The database administrator (DBA) is responsible for managing and coordinating all database activities. The DBA's job description includes database design, user coordination, backup, recovery, overall performance, and database security. The database administrator plays a crucial role in managing data for the employer. In the past the DBA job has required sharp technical skills along with management ability. (Shelly, Cashman, Waggoner 1992).

there are data dictionary management, data storage management, data transformation and presentation, security management, multiuser access control, backup and recovery management, data integrity management, database access languages and application programming interfaces, database communication interfaces, and transaction management. The first function of database management system is data dictionary. Database management system has been perform management functions to the elements in the database and how to connect the relationships with other data. When the system requires data in a database that will facilitate DBMS via SQL to access and search data. So that users can easily handle it.

QUESTION 1 Differentiate between database management system and information retrieval system by focusing on their functionalities. Database Management System known as DBMS is a computer program used to create, process, and administer the database. The DBMS receives requests encoded in Structural Query Language (SQL) and translates those requests into actions on the database. The DBMS is a large, complicated program that is licensed from a software vendor, companies almost never writes their own DBMS programs. Some DBMS examples include MySQL, PostgreSQL, Microsoft Access, SQL Server, FileMaker, Oracle, RDBMS,dBASE, Clipper and FoxPro.

It contains all the data definitions , report format and definitions of organizations which are related and system components. Database Management System- It is a commercial software system which is used to create , maintain and provide controlled access to the repository. Database - It is a collection of logically related data which is required to meet the needs of applications or users of organizations. SQL is a special purpose programming language designed for managing data held in relational database management systems(RDBMS). [1] 1.

Chapter I Define each of the following terms in your own word a) Database b) DBMS c) Metadata a) Database (Crucial Concept): A database is essentially a means of storage and retrieval of items of data. The data is usually either numerical or textual, although other data forms can be accommodated. A database is a collection of data held logically and with a purpose. Is designed and organized in such manner that it can be accessed later on for different purposes. For example we need to access our Database to update some information from it or just to extract it.

A procedure or function is a schema object that consists of a set of SQL statements and other PL/SQL constructs stored in the database and run as a unit to solve a specific problem. The principal benefit of server-side programming is that built-in functionality can be deployed anywhere. Oracle Database also stores program units written in Java. A Java stored procedure is a Java method published to SQL and stored in the database for general use. You can call existing PL/SQL programs from Java and Java programs from PL/SQL.

Some F & A data is provided to corporate via data files; some data is provided via hardcopy reports and must be re-entered; some data is provided via data files but must be converted (redirected) to the proper account codes. In sales department, each member of the sales force maintains their own set of customer records using a variety of tools. Some sales team members use paper and pencil, others sales management software such as Act, and others a hybrid. Marketing, Sales, and F& A departments have their own databases and the data can not be transfer from one database to another. Current data management system can be improved by using client/server.

Data is often stored in separate systems, sometimes making it difficult to obtain certain pieces of information. In order to retrieve data from a database, one has to use a database management system (DBMS). The database management systems are designed applications that interact with the user, other applications, and the database itself to capture and analyze data. The DBMS is designed to allow the definition, creation, querying, update, and administration of databases (DifferenceBetween.info, 2014). The DBMS relieves the programmer or end user from the task of under- standing where and how the data are actually stored by separating the logical a... ... middle of paper ... ...smissions.

For most software testing positions you need to have database knowledge to perform some database checks. Almost all applications require some kind of interaction with database. Let's consider the database interview questions for entry level software testing positions. For entry level testing positions generally following questions can be asked in interviews: 1) Basic and to some extent nested SQL queries to fetch data from database tables. 2) Examples of database statements for: Create Database, Create table and Drop Table.