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The importance of databases

Databases

With the great and tremendous development in the technologies used, and with the increased independence and reliance on the Internet, developers needed to develop a data portfolio in such a way that the information can be used in the best and easiest way; Data is very necessary, especially in our day. As a processing, it leads to giving results and maximum speed to business owners, where through this processed data they can make appropriate decisions for them in their various businesses and jobs.

The concept of a database is no different from the concept of recording employee data in the HR department, as they are logical tables linked together by logical relationships written in a specific programming language and each table is made up of a set of logically linked fields to facilitate the recovery process. Information and database request via software commands.

Importance of databases

Databases are of great importance in various companies and their importance is shown in many places, including:

  • Databases help greatly in speeding up the process of accessing the data they contain, so instead of searching here and there, the necessary data is collected to facilitate the process of accessing, processing, or using in various jobs in the future.
  • Databases facilitate the process of modifying this data in the future and facilitate the necessary update process, as well as facilitate the operations of deletion or addition.
  • It helps coordinate and hierarchically collect big data to facilitate its management and retrieval.
  • It helps coordinate and hierarchically collect big data to facilitate its management and retrieval.
  • Databases help answer any questions or requests directly related to the data that has been recorded and stored in these rules, at any time.

Database or file system?

Databases are characterized by easy storage and speed and reduce unnecessary information. As for the file system, we store difficult and requires very large storage space and difficulty in finding the required files quickly and accurately and many more countless others.

Databases languages

Databases are written in different languages ​​and programs, such as MySQL, Microsoft Access, PHP, and Python. Several formats for database projects, the most important of which are Oracle, Firebird, PostgreSQL, Cyberspace, Microsoft SQL, Informix, and many other environments.

Database help

SQL (Structured Query Language) is one of the most used languages ​​in database creation. SQL has a series of statements or commands that can be divided into three groups according to their nature:

  • DML: a language for data processing and has the following instructions:
Select to retrieve some records from one or more tables.
INSERT to create the records.
DELETE to delete the records.
UPDATE for modifying records.
  • DDL: Data Definition Language, and it has the following instructions:
CREATE To create a table, (views), (index) or any other purpose.
DROP to delete a table or any other purpose.
ALTER for modifying a schedule or any other purpose.
  • DCL: Data control language, and it has the following instructions:
GRANT gives privileges to the user.
REVOKE takes privileges from the user.

Database components

Databases consist of four basic components:

  • Data.
  • Hardware.
  • Programs.
  • Users.

Database installation

Databases have special combinations, including Relational combinations, which depend on specific and specific elements of different data elements, for example, if the value of one of the elements depends on calculations performed on other elements. As for the second structure, it is the structural structure, and this structure depends on the organizational relationship that connects the data elements. As for the third structure, it is the structure that is known as the hierarchical structure, and this structure is the one that depends on the existence of hierarchical relationships between the different elements. For example, multiple different data items can belong to one of them.

Duties and functions of the database administrator

The Database Manager (DBA) is the foremost database administrator who works in the database department in any work environment, such as companies or banks, as he is responsible for distributing all activities and adding to the rest of the ground rules for them, and is primarily responsible for database performance and availability and data integrity. Accessible by programmers or users, he must be familiar with the operation of data and have the experience that qualifies him for this sensitive position, in addition to his work of protecting data and related information, which may be exposed to it, and must have good communication skills with others to ensure great results in an on-page atmosphere.

The work of the database manager is usually done in the location of the database itself, so it does not need to work elsewhere and is responsible for giving programmers and users the access authority, to modify and monitor the database. There are many certificates that allow holders to fill the DBA position such as MySql, Oracle for DBAs, and Microsoft Certified Database Managers (MCDBA).

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