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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

How to solve the problem of using Pipelining to speed up queries in Redis

Request/ResponseprotocolsandRTTRedis is a client-server mode TCP service, also known as the implementation of the Request/Response protocol. This means that usually the completion of a request follows the following two steps: the Client sends an operation command to the Server, and reads the Server's response value from the TCP socket. Generally speaking, this is a blocking way for the Server to execute. Operate the command and then return the response value to the Client. For example, Client:INCRXServer:1Client:INCRXServer:2Clien

May 26, 2023 am 11:47 AM

redispipelining

Redis transaction instance analysis

The use of Redis in Redis implements transaction functions through multi, exec, discard, and watch. multi: start transaction exec: commit the transaction and execute discard: cancel the transaction watch: monitor any number of keys before the transaction starts>multiOK>setbookName"Redis"QUEUED>getbookNameQUEUED>saddtag"Redis""NewBook"QUEUED>smemberstagQUEUED>e

May 26, 2023 am 11:25 AM

redis

How to exclude the automatic configuration of redis in springboot

Springboot excludes the automatic configuration of redis because it needs to configure a redis link, so it excludes the configuration that comes with the system, namely RedisAutoConfiguration.class and RedisRepositoriesAutoConfiguration.class. It should be noted that RedisRepositoriesAutoConfiguration has a bean whose bean name is "redisTemplate". If there are dependencies, you need to exclude @SpringBootApplication(exclude={RedisAu

May 26, 2023 am 11:16 AM

redisSpringBoot

Example analysis of AOF persistence in Redis

1. Introduction to AOF One of the persistence methods of Redis, RDB, records the status of the database by saving key-value pairs in the database. Another persistence method, AOF, records the database status by saving the write commands executed by the Redis server. For example, for the following commands: The RDB persistence method is to save the three key-value pairs of str1, str2, and str3 into the RDB file, while the AOF persistence is to save the executed set, sadd, and lpush commands into the AOF file. . 2. AOF configuration Under APPENDONLYMODE in the redis.conf configuration file: ①. appendonly: The default value is n

May 26, 2023 am 11:08 AM

redisaof

How Redis uses different memory allocators to compare fragmentation rates

In the zmalloc.c source code of Redis, we can see the following code: /*Explicitlyoverridemalloc/freeetcwhenusingtcmalloc.*/ #ifdefined(USE_TCMALLOC) #definemalloc(size)tc_malloc(size) #definecalloc(count,size)tc_calloc(count,size )　#definerealloc(ptr,size)tc_realloc(ptr,size)　#de

May 26, 2023 am 10:58 AM

redis

How Nginx uses Lua+Redis to dynamically ban IPs

1. Background In our daily maintenance of the website, we often encounter such a requirement. In order to block certain crawlers or malicious users from making requests to the server, we need to establish a dynamic IP blacklist. For IPs in the blacklist, services will be denied. 2. There are many ways to implement the IP blacklist function in the architecture: 1. At the operating system level, configure iptables to reject network requests for specified IPs; 2. At the webserver level, configure the IP blacklist through the deny option of nginx itself or the Lua plug-in; 3. At the application level, check whether the client IP is in the blacklist before requesting the service. In order to facilitate management and sharing, we implement IP through the architecture of nginx+lua+redis

May 26, 2023 am 10:50 AM

redisnginxlua

How to use centralized cache Redis in Spring Boot

Try the definition of User entity @Entity@Data@NoArgsConstructorpublicclassUserimplementsSerializable{@Id@GeneratedValueprivateLongid;privateStringname;privateIntegerage;publicUser(Stringname,Integerage){this.name=name;this.age=age;}}Data access implementation of User entity (covers cache annotations) @CacheConfig(ca

May 26, 2023 am 10:49 AM

redisSpringBoot

How to add redis to php's Yii framework

1. Download the Rediscache plug-in and extract the plug-in to helloyii/app/protected/extensions: the location of the plug-in file after deployment should be: helloyii/app/protected/extensions/redis/CredisCache.php. Add it to yii's web.php configuration file yii-redis component 2. Install the redis extension of yii2 cd/www/html/basicphpcomposer.pharrequire--prefer-distyiisoft/yii2-redis3. In the w of yii

May 26, 2023 am 10:31 AM

PHPredisyii

Why is Redis so fast using single thread?

Why does Redis use single thread? Under normal circumstances, after using multi-threading, if there is no good system design, the overhead of multi-threading is actually as shown in the figure on the right (note the ordinate). When you first increase the number of threads, the system throughput rate will increase. When you further increase the number of threads, the system throughput rate will increase slowly or even decrease. The key bottleneck is that there are usually shared resources in the system that are accessed by multiple threads at the same time. In order to ensure the correctness of the shared resources, additional mechanisms are needed to ensure thread safety, such as locking, which will bring additional overhead. For example, take the most commonly used List type as an example. Assume that Redis adopts a multi-thread design and there are two threads A and B doing LPUSH and LPU on the List respectively.

May 26, 2023 am 09:56 AM

redis

How to build a redis three-master and three-slave cluster with docker

1. Prepare the redis image and container 1.1. Download redis6.0.8dockerpullredis:6.0.81.2 Prepare 6 server configuration files #redis configuration is placed at the end of the article mkdir-p/usr/local/repository/redis/redis-node-1#Configuration reference At the end of the article vim/usr/local/repository/redis/redis-node-1/redis.confcd/usr/local/repository/redis#Copy the other 5 copies in sequence cp-rredis-node-1/./redi

May 26, 2023 am 09:47 AM

Dockerredis

How SpringBoot implements redis cache menu list

Because the system's menu list is not easily changed, there is no need to query the database every time it is requested. Therefore, when the menu list is requested for the first time based on the user ID, the menu list data can be cached in redis Here, when requesting the menu list for the second time, you can directly obtain the data from the redis cache, thereby reducing operations on the database and improving performance! First, we need to download redis locally, then open the src directory of redis in the cmd terminal, and then run redis-server to start the redis local service (mac). After opening the redis service, we must configure the relevant redis in the project Code, first in pom.xml

May 26, 2023 am 09:43 AM

redisSpringBoot

What are redis serialization and various serialization situations?

Serialization basically uses jdk serialization by default, which will cause string escaping. In actual development, when we want to store objects in redis, we must serialize them. Of course, if we convert the object into a json string, what is stored is equivalent to a string. Not serializing does not affect normal operation. However, we usually have to serialize the objects we create. If we don't serialize, we may use json to convert the stored objects in actual development, and we don't want to use jdk serialization yet (the default is jdk serialization). At this point we need to use the configuration class. We create a redisTemplate object to overwrite the original redistemplate object in the bean container. Serialization

May 26, 2023 am 09:40 AM

redis

Application examples of Redis in recommendation systems

Application examples of Redis in recommendation systems With the development of the Internet and the explosive growth of information, information overload has become a major problem affecting people's access to information. Therefore, the recommendation system emerged as the times require. It can predict user behavior through algorithms and provide personalized recommendation services, which greatly improves user experience and product profits. The implementation of the recommendation system requires a large amount of data storage, processing and calculation, and Redis is an excellent solution. Redis is a high-performance NoSQL database,

May 12, 2023 am 11:21 AM

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