What is a Database?
Database is any collection of data, or information, that is specially organized for rapid search and retrieval by a computer. Databases are structured to facilitate the storage, retrieval, modification, and deletion of data in conjunction with various data-processing operations.
What is DBMS?
A database management system (DBMS) extracts information from the database in response to queries.
A database is stored as a file or a set of files on magnetic disk or tape, optical disk, or some other secondary storage device. The information in these files may be broken down into records, each of which consists of one or more fields. Fields are the basic units of data storage, and each field typically contains information pertaining to one aspect or attribute of the entity described by the database. Records are also organized into tables that include information about relationships between its various fields.
Queries are the main way users retrieve database information. The power of a DBMS comes from its ability to define new relationships from the basic ones given by the tables and to use them to get responses to queries.
Types of DBMS?
Four Types of DBMS systems are:
Hierarchical, Network, Relational (RDBMS) & Object-Oriented DBMS
What is Hierarchical Database?
In a Hierarchical database, model data is organized in a tree-like structure. Data is Stored Hierarchically (top down or bottom up) format. Data is represented using a parent-child relationship. In Hierarchical DBMS parent may have many children, but children have only one parent.
What is Network DBMS?
The network database model allows each child to have multiple parents. It helps you to address the need to model more complex relationships like as the orders/parts many-to-many relationship. In this model, entities are organized in a graph which can be accessed through several paths.
What is Object-Oriented DBMS?
In Object-oriented Model data stored in the form of objects. The structure which is called classes which display data within it. It defines a database as a collection of objects which stores both data members values and operations.
What is RDBMS?
RDBMS stands for Relational Database Management System. Relational DBMS is the most widely used DBMS model because it is one of the easiest.
RDBMS is the basis for SQL, and for all modern database systems such as MS SQL Server, IBM DB2, Oracle, MySQL, and Microsoft Access.
The data in RDBMS is stored in database objects called tables. A table is a collection of related data entries and it consists of columns and rows. This model is based on normalizing data in the rows and columns of the tables.
What are the advantages of DBMS?
The advantages of DBMS are as follows:
- Data Independence: Allows to change the structure of the data without affecting the structure of any of the running application programs.
- Sharing of Data: Multiple users can use data from the same database simultaneously.
- Integrity constraints: These constraints allow the data to be stored in a database in a refined manner.
- Redundancy control: Supports a mechanism to control the redundancy of data by integrating all the data into a single database.
- Provide backup and recovery facility: Provides a feature of ‘backup and recovery’ to automatically create the data backup and restore the data as and when required.
What is SQL?
SQL stands for Structured Query Language. SQL is a standard language for accessing and manipulating databases.
Popular DBMS Software:
Here, is the list of some popular DBMS system:
- Microsoft Access
- IBM DB2
- LibreOffice Base
- Microsoft SQL Server etc.