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Technical Articles

Database

Redis

How to deploy redis cluster

1. Redis master-slave architecture 1.1. Master-slave replication principle The slave server connects to the master server and sends the PSYNC command; after the master server receives the PSYNC naming, it starts executing the BGSAVE command to generate the RDB file and uses the buffer to record all write commands executed thereafter; the master server After the server BGSAVE is executed, it sends snapshot files to all slave servers and continues to record the executed write commands during the sending process; after receiving the snapshot file, the slave server discards all old data and loads the received snapshot; the master server snapshot is sent. Then start sending write commands in the buffer to the slave server; the slave server completes loading the snapshot, starts receiving command requests, and executes write commands from the master server buffer; (slave server initialization is completed) the master

May 27, 2023 pm 06:05 PM

redis

How does php enable the Swoole/Pool process pool to implement Redis persistent connections?

PHP allows the Swoole|Pool process pool to implement the Redis persistent connection process pool, which is implemented based on the Manager management process module of Swoole\Server. It can manage multiple work processes. Compared with Process to implement multiple processes, Process\Pool is simpler and has a higher encapsulation level. Developers can implement process management functions without writing too much code. With Co\Server, pure coroutine style can be created. , a server-side program that can utilize multi-core CPUs. Swoole process pool implements redis data reading in the following case. Start the Redis process pool through WorkerStart and read the Redis list data persistently; when WorkerStop is disconnected

May 27, 2023 pm 05:55 PM

PHP redis swoole

How to install redis-dump tool

The redis-dump tool is used to build the environment for data migration in the cluster: 192.168.19.201redis-cluster637970017002rvmredis-dump192.168.19.202redis-cluster637970017002192.168.19.203redis-cluster637970017002 due to the installation of the redis-dump tool You need to use rvm and gem tools, so they must be installed in advance. 1. Install the dependency packages required to install rvm and other tools in advance #yum-yinstallzlibzlib-develpcrepcre

May 27, 2023 pm 05:52 PM

redis dump

How to use Java to operate Redis database

Redis is a memory-based database that interacts with Redis to greatly improve the speed of operation. First, let us create an ordinary Maven project, add the corresponding dependency redis.clientsjedis3.3.0com.alibabafastjson1.2.72 and then we can use the test connection (here I use the local reids service) // define the host number, Port number HostAndPorthostAndPort=newHostAndPort("127.0.0.1",6379);//Connect the redis service Jedisjedis=ne

May 27, 2023 pm 05:52 PM

数据库 Java redis

Example analysis of Redis's zmalloc function

Let's look directly at the custom zmalloc function in the Redis source code (not the latest version). This function is used in exactly the same way as regular functions such as malloc. The difference lies in its internal implementation details. void*zmalloc(size_tsize){//Allocate memory; void*ptr=malloc(size+PREFIX_SIZE);//Allocation failure throws an exception; if(!ptr)zmalloc_oom_handler(size);//Can the system use "malloc_size" function? #ifdefHAVE_MALLOC_SIZEupdate_zmalloc

May 27, 2023 pm 05:50 PM

redis

How to implement responsive Redis interaction in Spring

This article will simulate a user service and use Redis as the data storage server. Involving two javabeans, users and rights publicclassUser{privatelongid;privateStringname;//label privateStringlabel;//receiver address longitude privateDoubledeliveryAddressLon;//receipt address dimension privateDoubledeliveryAddressLat;//latest sign-in day privateStringlastSigninDay;//points privateIntege

May 27, 2023 pm 05:49 PM

Spring redis

What are the knowledge points of Redis ordered set zset?

The redis ordered collection zset is very similar to the ordinary collection set. It is a string collection without repeated elements. The difference is that each member of an ordered set is associated with a score, and this score is used to sort the members of the set from the lowest score to the highest score. The members of the set are unique, but the ratings are repeatable. Because the elements are ordered, you can quickly get a range of elements based on score or position. Accessing intermediate elements in a sorted set is also very fast, since you can use the sorted set as a smart list without duplicate members. zadd: add element zrange:score

May 27, 2023 pm 05:23 PM

redis zset

How to solve the problem of redis expiration time

1. How to modify a redis' String expiration key multiple times to ensure that it can still retain the deletion time when it was first set. For modifying String, redis has: set, setex, append, incr, decr, etc. Among them, use set and setex To modify the original existing String, the originally set expiration time will be reset. Strictly speaking, set and setex are not "modifications", but overwriting, so the originally set key-value will be overwritten by set/setex again. Drop the original one. The test results using tryredis are as follows: If you use append, incr, decr and other commands to modify, it will not be repeated.

May 27, 2023 pm 04:49 PM

redis

What is the concept of Redis cache penetration and cache avalanche

1. Cache penetration 1. Concept The concept of cache penetration is very simple. The user wants to query a data and finds that the redis memory database does not have it, that is, the cache does not hit, so it queries the persistence layer database. It was found that there was none, so this query failed. When there are many users, the cache does not hit, so they all request the persistence layer database. This will put a lot of pressure on the persistence layer database, which is equivalent to cache penetration. Here you need to pay attention to the difference from cache breakdown. Cache breakdown means that a key is very hot and is constantly carrying large concurrency. Large concurrency focuses on accessing this point. When the key fails at the moment, it continues to Large concurrency breaks through the cache and directly requests the database, which is like cutting a hole in a barrier.

May 27, 2023 pm 04:35 PM

redis

How to install redis server in debian

To install Redis on Ubuntu system, use the source to install Redis. Use the following command: apt-getupdateapt-getinstallredis-server to start Redis. Redis-server checks whether redis starts redis-cli. The above command will open the following terminal: redis127.0.0.1:6379>127.0.0.1 is the current terminal. Machine IP, 6379 is the redis service port. Now we enter the PING command. redis127.0.0.1:6379>pingPONG The above shows that we have successfully installed redis. Install from source on Ubuntu system

May 27, 2023 pm 04:31 PM

redis debian

Analysis of enterprise examples of SMS login using Redis

1. Import the dark horse review project. The dark horse review project mainly includes the following functions: 1. Import SQL private messages that require project information. The tables are: tb_user: user table tb_user_info: user details table tb_shop: merchant information table tb_shop_type: merchant type table tb_blog: User diary table (expert store visit diary) tb_follow: User follow table tb_voucher: Coupon table tb_voucher_order: Coupon order table Note: The version of Mysql adopts version 5.7 and above 2. Separate the front and back ends 3. Import the back end project 3.1 Import the back-end project into Idea 3.2 Note: Modify the applica

May 27, 2023 pm 04:19 PM

redis

What is the principle of Redis distributed lock and how to implement it

1 One person, one order concurrency security issue The pessimistic lock used in the previous one person, one order business cannot take effect in a distributed system. The ideal situation is this: one thread successfully acquires the mutex lock and queries the order and creates the order, and other threads cannot intervene. The principle is that there will be a lock monitor to monitor who has obtained the lock. But the problem arises: in a distributed system, there are multiple different JVMs. In different JVM environments, there are multiple lock listeners, and some threads may have obtained locks before other threads. , the lock can still be acquired. At this time, the locks in ordinary JVM no longer work, so we need to use distributed locks. 2 Principle and implementation of distributed lock 2.1 What is distributed lock? It can satisfy

May 27, 2023 pm 04:16 PM

redis

How to install and configure redis in CentOS

1. Download and refer to the operation guide provided by the redis official website. The official website address is https://redis.io/download. There are download and installation methods at the bottom. Create a directory and download the compressed package wgethttps://download.redis.io/releases/redis-6.2.4.tar.gz. Decompress tarxzfredis-6.2.4.tar.gz. 2. Install and enter the folder directory to compile (note: this There is a redis description file "README.md" in the directory. Please take a look at it when you have time) cdredis-6.2.41. Compile make. If the compilation is successful, start the service directly for verification. Note: this if

May 27, 2023 pm 04:13 PM

redis CentOS

What is the basic data structure of Redis?

Integer set When a set only contains integers and there are not many elements in the set, Redis will use the integer set intset. First look at the data structure of intset: typedefstructintset{//Encoding method uint32_tencoding;//Number of elements contained in the set uint32_tlength;//Array to save elements int8_tcontents[];}intset; In fact, the data structure of intset is relatively easy to understand. A data stores elements, length stores the number of elements, which is the size of contents, and encoding is used to store the encoding method of data. Through code we

May 27, 2023 pm 04:02 PM

redis