Functions of DBMS
DBMS provides several functionalities, which are discussed below:
1. Data Storage Management
Creating and managing a database for complicated data is one of the most crucial responsibilities of DBMS. By giving complex data sets a framework that makes them easy to access and manipulate, it provides the user with relaxation. In addition to storing data, current database systems also store and handle metadata, or data of data, such as validation standards and data procedural rules. Additionally, DBMSs offer performance adjusting, which facilitates quicker and simpler data access.
2. Security Management
Another area that the database management systems tackle is security. High levels of security are provided by database systems, which use a variety of security methods to protect and preserve data privacy. Certain security guidelines determine which users and what data can be retrieved from the database. Additionally, it confirms which operations (read, write, and delete) are possible for the particular data. For businesses that need databases with multiple users, it is crucial.
3. Back up and Recovery Management
The database system offers backup and recovery management options to protect the data and maintain its integrity. In the event that the system fails for any reason, the data is recovered and protected.
4. Data Dictionary Management
Another helpful feature offered by the Database Management System is data dictionary management. The data and the information relevant to its relationship are stored in the data dictionary. To avoid the need for sophisticated coding to store the relationship in the database, a data dictionary maintains the data structures and their relationships with other data. Data abstraction and data dependency removal from the system are provided by DBMS.
5. Multiuser Access Control
Another feature offered by modern database systems is multi-user access control. As a result, there are no issues when multiple users access the database simultaneously. This functionality ensures that the data in the database is accurate. Additionally, it maintains the ACID property, which guarantees that the database will remain consistent even when several users are using it at once. For databases belonging to companies where several database engineers are working at once, it is quite helpful.
6. Data Integrity Management
By reducing data redundancy and increasing data consistency, database systems manage data integrity. To maintain the integrity of the data, the feature database system called the data dictionary is utilized to hold the relationships between the data. When there is a transaction-based database system in place, data integrity is required.
Components of DBMS
An advanced piece of system software called a database management system (DBMS) is made up of several interconnected parts that work together to provide a standardized, controlled environment for adding, retrieving, and editing data in databases.
These elements consist of the following:
1. Storage Engine
Data is stored in this fundamental component of a DBMS. To store data, the DBMS needs to communicate with an operating system-level file system. It can communicate with the actual data at the file system or store data using extra components.
2. Database Access Language
In order to access the data, the DBMS must also offer an API. This API is usually in the form of a database access language, which may be used to create database objects, secure and allow access to the data, and alter data. An example of a database access language is SQL, which includes a number of command sets, such as data definition language for establishing database structures, data control language for approving data access, and data manipulation language for reading and changing data.
3. Optimization Engine
Additionally, a DBMS can offer an optimization engine that interprets database access language requests and converts them into useful instructions for data access and modification.
4. Lock Manager
Concurrent access to the same data is managed by this essential DBMS component. Locks are necessary to prevent several users from trying to edit the same data at the same time.
5. Log Manager
All modifications made to the data that the DBMS manages are documented by the DBMS. The log manager component of the DBMS is used to make sure that log records are created accurately and efficiently. The log is the record of changes. The DBMS connects with database utilities to perform recoveries and build backups, and it uses the log manager to assure data integrity during shutdown and startup.
6. Reporting and Monitoring Tools
To provide more capabilities for data management and analysis, the majority of DBMSs are coupled with reporting and monitoring tools. While monitoring tools keep tabs on different database indicators, like resource usage and user activity, reporting tools create reports.
