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A database is a set of structured and related data used in computer systems to manage, store and retrieve data. Databases are stored as electronic files in computer systems and can be easily managed using different software.

Databases are widely used in different systems. For example, databases are used in financial management programs, banks, electronic payment systems, content management systems, etc. There are different types of databases that we will examine below.

The use of databases is very common in many fields and industries, and its importance in society is increasing daily. Depending on the type of data and the needs of each industry, the use of databases can be different, but some common uses of databases are:

1- Content management systems (CMS)

These systems manage and publish web content, including content and images on websites and applications. These systems use relational databases such as MySQL and PostgreSQL.

2- User interface management systems (CRM)

These systems are used for customer relationship management, such as customer information, purchase history, and customer activities. These systems usually use relational databases such as Oracle and Microsoft SQL Server.

3- Inventory management systems (IMS)

These systems manage the inventory of goods and materials used in various industries, such as production and distribution. These systems usually use relational databases such as MySQL and PostgreSQL and NoSQL databases such as MongoDB.

4- Medical information management systems (HIS)

These systems manage patients’ medical information, including medical records, diagnoses, and treatments. These systems use relational databases such as MySQL and PostgreSQL and NoSQL databases such as MongoDB.

5- Order management systems (OMS)

These systems manage customer orders, including order checkout, payment, delivery, and customer reviews. These systems usually use relational databases such as MySQL and PostgreSQL and NoSQL databases such as MongoDB.

Databases are generally used in many industries and application fields, such as e-commerce, banking, transportation, education, communication, human resource management, etc. In short, databases are very important and useful in any industry that requires data management and storage.

In the following (first part), we mention some types of databases and their features:

Relational Database

This type of database is based on a relational model where information is stored in tables and relationships. In a relational database, tables have different columns, each row corresponding to a specific record. The features of this type of database include ACID support (Atomicity, Consistency, Isolation, Durability), support for all types of primary keys, the ability to create relationships between tables, the ability to execute queries to retrieve information, the ability to create stable software, and the ability to upgrade.

It is one of the databases designed and implemented based on the relational model. In this type of database, information is stored in tables, and relationships between tables are established using primary keys and foreign keys.

Other relational database features include:

1- ACID support

In a relational database, transactions must support operations performed automatically and definitively. ACID includes Atomicity, Consistency, Isolation, and Durability, each used in a specific way for data management. For example, Atomicity means that transactions must be applied all or none at all, and Consistency means that data must be in a valid and consistent state at all times.

2- Support for primary keys

Each table must have a primary key to identify records in a relational database. This bider key defines the column or columns of the table and is used to search, reference, and create relationships with other tables.

3- Ability to create relationships between tables

Using foreign keys, relationships between tables are established. These relationships can be one-to-one, one-to-many or many-to-many, increasing useful information in the database.

4- The ability to execute queries to retrieve information

In a relational database, queries are executed to search, filter and combine information based on various conditions. These queries can include SELECT, INSERT, UPDATE, and DELETE.

5- Ability to create stable software

Relational database using ACID has features that make the database stable and reliable. These features can create stable and reliable software.

6- Upgradability

It is upgradeable and can be adapted according to new data needs. In general, this feature means that you can add new tables, make changes to the structure of existing tables, add new fields, and

Similarly, the database was easily upgraded and responded to new needs.

Finally, it is a powerful way to store and manage data in a system that provides high reliability, stability, and scalability by using tables, primary and foreign keys, queries, and ACID features.

Object-Oriented Database

In this type of database, information is stored object-oriented, where objects have properties and relationships with other objects. Other features of this database include support for all types of object-oriented relationships, the ability to structure data, the ability to use inheritance, the ability to use polymorphism and encapsulation, the ability to complicate data, the ability to be flexible, and the ability to upgrade.

Object-Oriented Database is a type of database that uses the object-oriented model to store and manage data. In this type of database, data is stored object-oriented and supports object-oriented capabilities such as inheritance, polymorphism, polymorphism, and abstraction.

Other features of an object-oriented database include:

1- Ability to support object orientation

In an object-oriented database, data is stored object-oriented, and object-oriented capabilities such as inheritance, polymorphism, polymorphism, and abstraction are supported. In other words, this database allows different objects with different characteristics and behaviors to be stored and used independently.

2- No need to convert data

In an object-oriented database, data is stored object-oriented, so it is unnecessary to convert them into another form. This feature makes it possible to perform operations such as search, filter, sort, etc. on the data directly without transforming the data.

3- The ability to perform complex processing

More complex processing can be done on the data using an object-oriented database. For example, queries can easily be made using different objects related to each other.

4- Extensibility

It is extensible, and it is easy to add new objects and features, such as relationships between objects, inheritance, polymorphism, and polymorphism. This feature enables the database to respond to new data needs and adapt to changes in the data structure.

5- Ability to support transactions

It can support transactions, which means ACID support. This feature makes the transactions to be definitively returned to the initial state in case of an error, and the data in the database has high durability.

6- Ability to support different paradigms

It can support different paradigms such as object-oriented, relational, sequential, etc. This feature allows the database to be compatible with different paradigms and respond to different data needs.

Finally, it is a powerful method to store and manage object-oriented data using object-oriented capabilities, no need to transform data, the ability to perform complex processing, extensibility, transaction support, support for various paradigms, and other features. Using this database, you can easily work with object-oriented data and perform more complex processing.

Network Database

In this type of database, information is stored in the form of a graph, and the relationship between the data is established using complex relationships. Other features include complex search capabilities, support for various types of relationships, the ability to execute queries to retrieve information, flexibility, and upgradeability.

A network database is a type of database in which data is stored in the form of a network graph. In this type of database, each record can be connected to several other records arbitrarily, and in this way, connections between data are formed in a network.

Other network database features include:

1- Ability to support complex communication

Each record can be connected to several other records in a network database as desired. This feature makes more complex connections between data in a network form, and these connections can be easily accessed.

2- No need to repeat data

In the network database, the data is stored graphically, and in this way, there is no need to repeat the data in different places. This feature reduces storage space consumption.

3- Fast search capability

In the network database, it is easy to access the connections between the data and use them to perform a quick and accurate search on the data.

4- The ability to perform complex processing

By using a network database, more complex processing can be done on the data. For example, queries can easily be performed using network connections between data.

5- Extensibility

The network database is expandable, and new records and connections can be easily added. This feature enables the database to respond to the needs of new data and adapt to changes in the data structure.

6- Ability to support transactions

It can support transactions, which means ACID support. This feature allows transactions to be definitively returned to the initial state in the event of an error.

Finally, a network database using a network graph, the ability to support complex communication, no need to duplicate data, fast search, perform complex processing, expandability, transaction support, and other features, is a powerful way to store and manage network data. Is. Using this database, you can easily work with network data and perform more complex processing.