Course Intermediate  3500

Course Introduction：This set of courses is based on the design concept and data structure of MySQL index, index usage scenarios, index classification, index usage scenarios, index performance analysis, query optimization, slow query of MySQL index, etc. It mainly describes the solution of MySQL index optimization. It is very suitable for students who have basic knowledge of MySQL or have certain work experience. The course explains how to solve the problem of slow large-volume queries, how to write an efficient SQL, how to optimize query statements, what is the implementation principle of indexes, how to optimize indexes... and many other difficulties and interview points in SQL index optimization.

Course Elementary  12802

Course Introduction："AJAX Cross-Domain Solution: JSONP Video Tutorial" The core of ajax is the JavaScript object XmlHttpRequest. This object was first introduced in Internet Explorer 5 and is a technology that supports asynchronous requests. This video introduces the ajax cross-domain solution.

Course Intermediate  8113

Course Introduction：Caching is a core component of current enterprise-level applications. Today's mainstream e-commerce, life services, live broadcast and other fields are inseparable from the use of cache. As the current mainstream caching technology, Redis has become the first choice for Internet companies. The cache structure design based on redis cluster currently accounts for half of the market in the same field.

Course Advanced  45465

Course Introduction：This set of courses is an advanced course, including: query optimization and performance analysis of MySQL single table with tens of millions of data, mySQL master-slave principle and its application in high-concurrency systems, integration and use of Elasticsearch and PHP (Laravel), high concurrency The difference between system code and ordinary system code architecture and analysis of concerns, etc.

Course Intermediate  11422

Course Introduction："Self-study IT Network Linux Load Balancing Video Tutorial" mainly implements Linux load balancing by performing script operations on web, lvs and Linux under nagin.

Course Introduction：Common file permission setting errors encountered in Linux systems and their solutions In the Linux operating system, setting file permissions is a very important task. Correctly setting file permissions can protect the security of the system and prevent confidential data from being illegally obtained or modified. However, due to various reasons, sometimes file permissions may be set incorrectly. This article will introduce some common file permission setting errors and provide solutions. Error: Set the owner of the file to the root user Solution: In Linux system

2023-06-30 comment 0  2328

Course Introduction：How to solve file permission issues in C++ development During the C++ development process, file permission issues are a common challenge. In many cases, we need to access and operate files with different permissions, such as reading, writing, executing and deleting files. This article will introduce some methods to solve file permission problems in C++ development. 1. Understand file permissions Before solving file permissions problems, we first need to understand the basic concepts of file permissions. File permissions refer to the file's owner, owning group, and other users' access rights to the file. In Li

2023-08-21 comment 0  1940

Course Introduction：How to solve: Java file operation error: Insufficient file permissions When using Java for file operations, you sometimes encounter an error of insufficient file permissions. This error usually occurs when trying to read, write, or delete a file, and the corresponding operation cannot be performed due to insufficient permissions of the current user. This article will introduce several common solutions to help readers solve this problem. Checking File Permissions First, you need to check the file permission settings. You can check the permissions of a file with the following code example: importjava.io.Fi

2023-08-27 comment 0  715

Course Introduction：How to solve Java file encryption permission exception (FileEncryptionPermissionException) Overview: Java file encryption is a common method to protect file security, but sometimes you may encounter permission exceptions when performing file encryption operations. This article will introduce methods to solve Java file encryption permission exceptions and provide relevant code examples. Check file access permissions: First, we need to make sure the user the program is running as has sufficient permissions to access the files we want to encrypt. For using J

2023-08-19 comment 0  763

Course Introduction：How to solve Java file permission exception (FilePermissionException) In Java programming, we often involve operations on files, such as reading, writing, deleting, etc. However, sometimes we may encounter file permission exceptions (FilePermissionException), which may prevent our program from running normally. This article describes some common workarounds and provides corresponding code examples. Checking File Permissions First, we need to make sure that the program

2023-08-19 comment 0  1130