What are the two aspects of database security?
Database security includes two aspects: system operation security and system information security. Protection technologies for database security include: database encryption (core data storage encryption), database firewall (anti-vulnerability, anti-attack), data desensitization (anonymization of sensitive data), etc.
Database security includes two levels of meaning:
The first level refers to system operation Security, system operation security is usually threatened as follows. Some network criminals invade the computer through the network, LAN, etc., causing the system to fail to start normally, or overloading the machine to run a large number of algorithms, and turning off the CPU fan, causing the CPU to overheat. Burning and other destructive activities;
The second layer refers to system information security. The threats to system security are usually as follows: hackers invade the database and steal the desired information. The security features of database systems are mainly for data, including data independence, data security, data integrity, concurrency control, fault recovery and other aspects.
Database security protection technologies include: database encryption (core data storage encryption), database firewall (anti-vulnerability, anti-attack), data desensitization (anonymization of sensitive data), etc.
Security issues:
Information leakage shows two trends:
(1) Hackers use B/S applications, Use the Web server as a springboard to steal data from the database; traditional solutions do not have any control over application access and database access protocols. For example, SQL injection is a typical database hacker attack method.
(2) Data leakage often occurs internally, and a large number of operation and maintenance personnel are directly exposed to sensitive data. Traditional network security solutions that focus on external prevention have lost their use.
The database has become the protagonist in these leaks. This is related to the fact that we have ignored database security issues in traditional security construction. In the traditional information security protection system, the database is at the core of protection and is not easily exposed to external threats. Hacker attacks, and the database itself already has powerful security measures, which seems safe enough on the surface, but this traditional security defense idea has fatal flaws.
Features
The security features of the database system are mainly for data, including data independence, data security, and data integrity. , concurrency control, fault recovery and other aspects. The following introduces them respectively
Data independence
Data independence includes two aspects: physical independence and logical independence. Physical independence means that the user's application program and the data in the database stored on the disk are independent of each other; logical independence means that the user's application program and the logical structure of the database are independent of each other.
Data Security
Objects in the operating system are generally files, and the application requirements supported by the database are more sophisticated. Usually a relatively complete database takes the following measures for data security:
(1) Separate the parts of the database that need to be protected from other parts.
(2) Adopt authorization rules, such as account, password and permission control and other access control methods.
(3) Encrypt the data and store it in the database.
Data integrity
Data integrity includes the correctness, validity and consistency of data. Correctness means that the input value of the data is of the same type as the corresponding field of the data table; validity means that the theoretical value in the database meets the constraints of the value segment in real applications; consistency means that the same data used by different users should be the same of. To ensure data integrity, it is necessary to prevent legitimate users from adding unsemantic data to the database when using the database.
Concurrency control
If a database application wants to realize multi-user sharing of data, multiple users may want to access data at the same time. This kind of event is called a concurrent event. When a user retrieves data for modification, if another user retrieves the data before the modification is stored in the database, the read data will be incorrect. At this time, it is necessary to control this concurrent operation, eliminate and avoid such errors, and ensure the correctness of the data.
Fault recovery
The database management system provides a set of methods to detect and repair faults in a timely manner, thereby preventing data from being damaged. The database system can recover as quickly as possible from failures that occur when the database system is running, which may be physical or logical errors. For example, data errors caused by misoperation of the system, etc.
Recommended learning: "Database Video Tutorial"
The above is the detailed content of What are the two aspects of database security?. For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics



Go language is an efficient, concise and easy-to-learn programming language. It is favored by developers because of its advantages in concurrent programming and network programming. In actual development, database operations are an indispensable part. This article will introduce how to use Go language to implement database addition, deletion, modification and query operations. In Go language, we usually use third-party libraries to operate databases, such as commonly used sql packages, gorm, etc. Here we take the sql package as an example to introduce how to implement the addition, deletion, modification and query operations of the database. Assume we are using a MySQL database.

Apple's latest releases of iOS18, iPadOS18 and macOS Sequoia systems have added an important feature to the Photos application, designed to help users easily recover photos and videos lost or damaged due to various reasons. The new feature introduces an album called "Recovered" in the Tools section of the Photos app that will automatically appear when a user has pictures or videos on their device that are not part of their photo library. The emergence of the "Recovered" album provides a solution for photos and videos lost due to database corruption, the camera application not saving to the photo library correctly, or a third-party application managing the photo library. Users only need a few simple steps

Hibernate polymorphic mapping can map inherited classes to the database and provides the following mapping types: joined-subclass: Create a separate table for the subclass, including all columns of the parent class. table-per-class: Create a separate table for subclasses, containing only subclass-specific columns. union-subclass: similar to joined-subclass, but the parent class table unions all subclass columns.

HTML cannot read the database directly, but it can be achieved through JavaScript and AJAX. The steps include establishing a database connection, sending a query, processing the response, and updating the page. This article provides a practical example of using JavaScript, AJAX and PHP to read data from a MySQL database, showing how to dynamically display query results in an HTML page. This example uses XMLHttpRequest to establish a database connection, send a query and process the response, thereby filling data into page elements and realizing the function of HTML reading the database.

How to use MySQLi to establish a database connection in PHP: Include MySQLi extension (require_once) Create connection function (functionconnect_to_db) Call connection function ($conn=connect_to_db()) Execute query ($result=$conn->query()) Close connection ( $conn->close())

To handle database connection errors in PHP, you can use the following steps: Use mysqli_connect_errno() to obtain the error code. Use mysqli_connect_error() to get the error message. By capturing and logging these error messages, database connection issues can be easily identified and resolved, ensuring the smooth running of your application.

PHP is a back-end programming language widely used in website development. It has powerful database operation functions and is often used to interact with databases such as MySQL. However, due to the complexity of Chinese character encoding, problems often arise when dealing with Chinese garbled characters in the database. This article will introduce the skills and practices of PHP in handling Chinese garbled characters in databases, including common causes of garbled characters, solutions and specific code examples. Common reasons for garbled characters are incorrect database character set settings: the correct character set needs to be selected when creating the database, such as utf8 or u

Through the Go standard library database/sql package, you can connect to remote databases such as MySQL, PostgreSQL or SQLite: create a connection string containing database connection information. Use the sql.Open() function to open a database connection. Perform database operations such as SQL queries and insert operations. Use defer to close the database connection to release resources.
