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Redis command processing example source code analysis

This article is based on the community version of Redis 4.0.81. Command parsing The command request received by the Redis server is first stored in the querybuf input buffer of the client object, and then the parameters of the command request are parsed and stored in the argv and argc fields of the client object. The entry function for the client to parse the command request is readQueryFromClient, which reads the socket data and stores it in the input buffer of the client object, and calls the function processInputBuffer to parse the command request. Note: Inline commands: Use the telnet session to enter commands voidprocessInputBuffer(client*c){..

May 26, 2023 pm 01:10 PM

redis

How does RedisDesktopManager connect to redis remotely?

1. Download RedisDesktopManager and search it directly on the official website or csdn. 2. Install RedisDesktopManager for fool installation. Just click next. After the installation is completed, this is what it looks like. 3. Establish a remote connection. Before starting the connection, you need the following preparations. Modify the redis.conf file and command vimredis.conf. If your redis.conf is in other files, you need to add the file path. For example, mine is in the etc directory. Just add /etcvim/etc/redis.conf1 in front of redis. Set the host ip/ of the virtual machine or set it to 0.0 .0.0 is open to all. I just commented it out here.

May 26, 2023 pm 01:07 PM

redisRedisDesktopManager

What are the usage scenarios of Redis?

Summary of commonly used Redis commands: including time complexity summary and data structures used internally by specific data types; Redis’ advanced functions: including persistence, replication, sentinels, and cluster introduction; Understanding Redis: understanding memory and blocking; this part is very important Importantly, everything introduced before can be used as techniques, and this should be part of the Tao; Development skills: mainly a summary of some actual development practices, including cache design and common pitfalls. Let’s start the first part and take another look at Redis. The content of this series is based on: redis-3.2.12Redis is not a panacea. During interviews, I am often asked to compare the advantages and disadvantages of Redis and Memcache. I personally feel that the two are not suitable.

May 26, 2023 pm 12:52 PM

redis

How SpringBoot integrates Redis to use RedisRepositories

SpringBoot integrates Redis1. Add redis dependency org.springframework.bootspring-boot-starter-data-redisorg.apache.commonscommons-pool22. Add redis configuration information in application.properties spring.redis.host=127.0.0.1#Redis server connection port spring.redis.port=6379#Redis server connection password (default is empty) spring.redis.passwo

May 26, 2023 pm 12:50 PM

redisSpringBoot

How to solve the simple dynamic string problem of SDS in Redis

1. The structure of SDS. The C language does not have a string type, and is essentially a char[] array; and the size of the C language array must be initialized when it is created. It cannot be changed after the type is specified, and the last element of the character array is always the empty character '\0' . The following shows a C string with the value "Redis": Redis does not directly use the C language string method, but builds a simple dynamic string (Simple dynamic string, SDS) type. The underlying strings in Redis are The SDS structure is used for storage. For example, the bottom layer of key-value pairs containing strings is implemented using the SDS structure.

May 26, 2023 pm 12:50 PM

redissds

How nginx+redis realizes session sharing

1. The first step is to install redis. My server is Windows. I downloaded the installation-free version. Just decompress it. The directory is as follows. At the beginning, redis does not require a password by default. If you want to set a password, you can go to the redis.windows.conf file and find requirepass, delete the # sign in front, and set the password after it. 2. Enter the root directory of redis from cmd and type the following command: redis-server.exeredis.windows.conf. In this way, redis can be started. If the startup is successful, the following screen will appear. Of course, you can also modify the conf file and add a password. re

May 26, 2023 pm 12:49 PM

redissessionnginx

What are the application scenarios of Redis Cluster Edition and Redis Standard Edition?

Redis Cluster Edition - Dual-Copy Cloud Database Redis Dual-Copy Cluster Edition instance consists of three components: Proxy server (service proxy), shard server and configuration server. Proxy server: single-node configuration. There will be multiple Proxies in the cluster version structure, and the system will automatically implement load balancing and failover. Sharded server: Each sharded server has a dual-copy high-availability architecture. After the master node fails, the system will automatically switch between master and backup to ensure high availability of the service. Configuration server: used to store cluster configuration information and partitioning strategies. It currently uses a dual-copy high-availability architecture to ensure high availability. The Redis cluster version can effectively expand the data size in scenarios where the data volume is large, and supports larger storage capacity than the standard version.

May 26, 2023 pm 12:41 PM

redis

How to implement Redis transactions

The ACID attribute indicates that all operations in an atomic transaction are indivisible in the database, and either all operations are completed or none are executed. The execution of a consistency transaction converts data from one state to another. The integrity constraints of the database are not violated before the transaction starts and after the transaction ends. Isolation The isolation of a transaction requires that the objects of each read-write transaction are separated from the operation objects of other transactions, that is, the transaction is not visible to other transactions before it is committed. After the durability (Durability) database executes a transaction, the data modifications must be persisted and saved. When the database is restarted, the value of the data needs to be the modified value. R

May 26, 2023 pm 12:31 PM

redis

How to operate Redis in SpringBoot

Option 1: Create a project with SpringDataRedis Create a project and introduce Redis dependencies: After the creation is successful, you need to manually introduce the dependencies of commos-pool2, so the final complete pom.xml dependencies are as follows: org.springframework.bootspring-boot-starter-data-redisorg .springframework.bootspring-boot-starter-weborg.apache.commonscommons-pool2 mainly introduces SpringDataRedis+ connection pool. Configure R

May 26, 2023 pm 12:25 PM

redisSpringBoot

What is the Redis cache update strategy?

1. Benefits and costs of caching 1.1 Benefits Accelerate reading and writing: Because caches are usually all-memory (such as Redis, Memcache), and the storage layer usually has insufficient read and write performance (such as MySQL), the speed of memory reading and writing is much higher for disk I/O. The use of cache can effectively accelerate reading and writing and optimize user experience. Reduce back-end load: Help the back-end reduce access (Mysql is set with a maximum number of connections. If a large number of accesses reach the database at the same time, and the disk I/O speed is very slow, it is easy to cause the maximum number of connections to be used up, but Redis theoretical maximum) and complex calculations (such as very complex SQL statements), which greatly reduces the load on the backend. 1.2 Cost data inconsistency: caching layer and

May 26, 2023 pm 12:11 PM

redis

What is the method to compile and install redis from ubuntu source code?

1. Download the relevant dependency packages. If the server does not allow networking, you can prepare the relevant dependency packages in advance. apt-yinstalllrzszgccmakewget 2. Download the redis source package and unzip it 1http://download.redis.io/releasescd/datawgethttp://download.redis.io/releases/redis-5.0.3.tar.gztar-zxvfredis-5.0.3 .tar.gz 3. Enter the decompressed redis directory and compile 1cdredis-5.0.3/2make 4. Specify the installation

May 26, 2023 pm 12:10 PM

Ubunturedis

How to view the redis installation directory in Linux system

1. Check the installation directory under redis. If the which and whereis commands cannot find the installation directory, you can use the following method: ps-ef|grepredis to get the process number xxxx, and then ls-l/proc/xxxx/cwd. 2. To view the directories of redis-cli and redis-server, use whereisredis-cli. 3. Close redis1) First enter redis./redis-cli and enter the password auth ‘password’. 2) shutdown. If you use ./redis-clishutdown directly in the directory, it is off

May 26, 2023 am 11:55 AM

Linuxredis

How to implement Redis List operation in php

List operation //Insert a value from the head of the list. $ret=$redis->lPush('city','guangzhou');//Insert a value from the end of the list. $ret=$redis->rPush('city','guangzhou');//Get the elements in the specified range of the list. 0 represents the first element of the list, -1 represents the last element, and -2 represents the penultimate element. $ret=$redis->l

May 26, 2023 am 11:51 AM

PHPredislist

How to use RPM package to install redis in CentOS

Redis is a high-performance key-value database. The emergence of redis has largely compensated for the shortcomings of keyvalue storage such as memcached, and can play a very good supplementary role to relational databases in some situations. Early preparation platform: centos6.5x86_64 Installation: redis-3.0.7-4.el6.art.x86_64.rpm Download the rpm package and open the address http://pkgs.org/download/redis to enter according to your own Linux platform and what you need to install Go to the redis version and download the corresponding rpm package. Here we take redis3.0.7 as an example to install: [roo

May 26, 2023 am 11:47 AM

redisCentOSrpm