2. What is a DBMS? Briefly describe the components of a DBMS.
Database Management System(DBMS) is a collection of interrelated data (database) and set of programs to access and modify those data.
DBMS has several components. Each component has some specific task to perform. The Major components DBMS are as follows,
Hardware
Without hardware it is not possible to implement DBMS. The main hardware is the computer used for storing and accessing the data in database. Other hardware components used in DBMS are Storage devices, I/O devices, and electromechanical devices which makes interface between user and the database.
Software
This is main component of the DBMS. Software is the set of programs to access and control the data in the
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Granting of authorization for data access iv. Routine maintenance
End Users
The real users who the application programs to interact with the database to perform different operations stored in the database. Some of the operations are insertion, deletion, updating data in the database, etc.
Query processor
It converts the user queries into series of low level instructions. The query processor has the following components,
i. DDL interpreter:
It interprets DDL statements and records definitions in the data dictionary. ii. DML compiler:
It translates DML statements in the query language into an evaluation plan consisting of low level instructions. iii. Query evaluation engine:
It executes low level instructions (query evaluation plan).
Data
Data is the most important component of the DBMS. The main purpose of DBMS is to process the data in efficient and convenient way for the users. In DBMS, databases are defined, constructed, modified , inserted and accessed from the database. There are two types of data in the DBMS. They are
i. Meta data:
It is the data about data or description about data stored in the database. Data definition language(DDL) is used to manipulate this type of data. ii. Actual data:
This is data actually stored in the database by the users. Data manipulation language(DML) is used to manipulate this type of data.
3. Describe a primary key, candidate key, secondary key, foreign key, and a combination
A database administration framework (DBMS) is a PC programming application that connects with the client, different applications, and the database itself to catch and dissect information. A universally useful DBMS is intended to permit the definition, creation, questioning, upgrade, and organization of databases.
A Database Management System or (DBMS) is an essential tool for any organization or company in today’s modern world. A DBMS is “a group of programs that manipulate the database and provide an interface between the database and its users and other application programs” (Stair & Reynolds, 2011, p. 189). So in choosing the right DBMS there are many factoring issues with choosing the right one for the company or organization. When choosing a DBMS one has to think about how the system will ultimately help the company or organization with day to day processes and the goals of the company or organization.
Database, it is a place use to store lots of data. It can be seen as a filing cabinet. And database management system (DBMS) is software that specificity designs for managing the data in database such as create, update or delete them. General is including security, retrieval and backup features. User also allows using the data to create a report or share data with multi-user.
The data that is being stored in a database is known as Meta data. Meta data is also recognized as schema for the real world data. It expresses that what sort of data will be stored in the database, what will be size of a assured attribute of the real world data, how many and what qualities will be used to collect the data about the entity in the database.
Figure 11 shows the relationship of a database using DBMS, connecting the user with the information from the database. A database consists of many data from customers to orders, services, employees, and so on. The user can be a customer or employee. Employees use DBMS to find customer’s information, service types, and service provider information. Later in the process, the DBMS will then extract data from the database to answer the users’ questions.
Database Processing: is the system of collecting, storing, and processing data for the purpose of gathering information, managing information, and creating new knowledge from the stored data. Database Management Systems: Data processing in business is most often done using Database Management Systems (DBMS). A DBMS is used to create, process, and maintain a database. Some common inputs and outputs of a DBMS include; tables and forms to input data, queries to retrieve data, and reports to output and present data. Enterprise Database Managements Systems: this is a database system that supports a multi-user environment. These are most often used in large businesses that require employees to input and process data using a variety of different applications. Common enterprise technologies
Data objects can model relational data or advanced data types such as graphics, movies, and audio. Smalltalk, C++, Java, and others are objects used in object-oriented data. The object-relational is a combination of relational and object-oriented databases. Traditional and advanced data types can be used to construct database management systems. These systems can connect to a company’s website and update records as needed. Database Approach The main purpose of a database is data storage that can be stored and retrieved when needed. A popular common language called structured query language (SQL) is used to store and retrieve data in relational database. This language enables the systems to run a report or modify data or remove the data from the database. A database management system (DBMS) controls all aspects of a database, this is not limited to the creation, maintenance, and use of database. The DBMS ensures proper applications are able to access the database. An important purpose of a DBMS is to maintain the data definitions (data dictionary) for all the data elements in the database. It also enforces data integrity and security measures. Data Models Data models provide a contextual framework and graphical representation that aid in the definition of data elements. In a relational database, the data model lays the foundation for the database and identifies important entities,
A relational database Management system (RDBMS) is the physical and logical implementation of a relational
What is database management system? Database Management System is a database program. The DBMS manage incoming data, organize it, and provided ways for the data to be modified or extract by users or other programs. This cause, most database software comes with an Open Database Connectivity (ODBC) driver that allows the database to integrate with other databases. For example, common SQL statements such as SELECT and INSERT are translated from a program's proprietary syntax into a syntax other databases can understand. Some DBMS examples include PostgreSQL, MySQL, SQL Server, Microsoft Access, Oracle, FileMaker, RDBMS, dBASE, Clipper, and FoxPro. It is a software system that uses a standard method of retrieving, and running queries on data.
The RDBMS is so widely used because of its simplicity to understand relationships between data. The data can also be analyzed in many ways using queries, reports, etc. A database management system covers all functions of the business and is essential for businesses to be run efficiently. Since the introduction of this time of database management system in 1970 it has triumphed many former types of widely used databases and fended off new types of databases to remain the most common type.
What is DBMS? -Data base management Systems-This is a collection of computer processes which can be software, or firmware. A generalize or specialized computer is used to run this system. The DBMS uses a language or device to: Define the logical database of a specific database directly or through IRDS. (information resource dictionary system). Define the physical component, specify interrogations, and specify system control. (Gorman, 2015)
•Prepare database design documents using the data definition, data manipulation, and data control language components of the SQL language.
Database is a set of data. It has a regular structure and that is organized in such a way that a computer can easily find the desired information.
Database is simply a collection of data. A database helps and provides managers and decision making people with timely and relevant information that leads the company to organizational success. A database management system is totally different than regular database. A (DBMS) is a group of programs that manipulates the database.
There are several functions that DBMS performed to make sure the integrity of the data and data consistency in the database such as data storage, retrieval and update, A user-Accessible catalogue, transactional support, concurrency control services, recovery services, Authorization services, support for data communication, integrity services, services to promote data independence and utility services.