Programmer Group

Guidance:This article mainly introduces the installation steps of MySQL 5.7.23 binary installation of CentOS system, and the installation process of other versions is similar. 1. Preparation Uninstall old MySQL View the rpm package rpm -qa|grep mysql if available Find mysql residue package, delete if any, and ignore if no find / -name ...

udp protocol and process I. udp protocol QQ chat room #- sever import socket #Socket.sock? Dgram - > UPD protocol sever = socket.socket(type=socket.SOCK_DGRAM) #The server needs to bind an address to let others know where you are sever.bind( ('127.0.0.1', 9002) ) while True: #Send data to the server's user address data, ad ...

Create database mysqladmin -h '192.168.2.233' -u root -p create namc; View newly created database encoding mysql> SHOW VARIABLES LIKE 'character%' -> ; +--------------------------+----------------------------+ | Variable_name | Value | +--------------------------+----------------------------+ | character_s ...

tcp socket communication optimization and troubleshooting under Linux @Date 2018.12.09 I. optimization 1. TPC receiving window Problem: when the receiving window queue of TCP is blocked - > the sender continues to send - > the receiver loses - > the sender retransmits - > the network becomes bad Solution: the receiver tells the sen ...

TCP is a streaming protocol, UDP is a packet protocol. TCP and UDP are transport layer protocols in OSI model. TCP provides reliable communication transmission, while UDP is often used to let the broadcast and details control the application's communication transmission. Summary of differences between TCP and UDP: TCP UDP Is it connected? ...

Background: Today, I found a problem when simulating socket request //Test code public static void http(String path) throws Exception { URL url = new URL(path); final String host = url.getHost(); //If the port is specified, get the port, otherwise - 1 int port = url.getPort(); int defaultPort = url.getDefaultPo ...

Netty -- source code implementation of master-slave Reactor multithreading mode Overview What is EventLoopGroup? EventLoopGroup is a container for storing EventLoop, and it should have the function of thread pool. graph BT; EventLoopGroup --> EventExecutorGroup; EventExecutorGroup --> ScheduledExecutorService; Because EventLoopGr ...

Request step (client) Create socket connection through host and port Get the output stream in socket and write the request data to the output stream Get the input stream in the socket and read the response data in the input stream Response steps (server) Establish listening port and wait for TCP connection request Get the ...

TCP protocol TCP is a transmission control protocol, which establishes a two-way channel. Three handshakes to establish a connection The client sends a connection request to the server The server receives the request and returns the confirmation information to the client, and sends the connection request to the client The client receives the r ...

As you should all know, Android's messaging mechanism is based on Handler.Remember that I read several blogs a year ago and thought I knew Handler, Looper and MessageQueue.However, in fact, slowly during the process of looking at the source code, you will find that the contents of Handler are more than this, such as synchronization barrier, b ...