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- Analysis of String data type examples in Redis
- Overview: The string type is the most basic data storage type in Redis. It is binary safe in Redis, which means that this type can accept data in any format, such as JPEG image data or Json object description information. In Redis, the maximum data length that the string type Value can hold is 512M. Related command list: Command prototype time complexity command description return value APPENDO (1) If the Key already exists, the APPEND command appends the data of the parameter Value to the end of the existing Value. If the Key does not exist, the APPEND command will create a new Key/Value. The length of Value after appending. DECR
- Redis 1019 2023-06-03 10:47:49
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- How to implement redis double linked list in python
- Features of redis double linked list: len: O(1), get the length of the linked list head: O(1), the first node in the head tail: O(1) the first node in the tail acyclic: acyclic linked list void*: store any type data. (Dynamic language comes naturally) 2. Doubly linked list API interface creation/destruction/initialization: listCreatelistEmptylistRelease to add nodes/delete nodes: listAddNodeHeadlistAddNodeTaillistInsertNodelistDelNode implements iterator/forward/reverse traversal: listGetIteratorlistReleaseIte
- Redis 1387 2023-06-03 10:26:04
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- What are the solutions for redis distributed ID?
- Commonly used distributed ID solutions In distributed systems, it is very important to generate globally unique IDs, because in distributed systems, multiple nodes generating IDs at the same time may cause ID conflicts. The following introduces several commonly used distributed ID solutions. UUIDUUID (Universally Unique Identifier) is an identifier composed of 128 digits, which can guarantee global uniqueness because its generation algorithm is based on factors such as timestamp, node ID and so on. UUID can be generated using Java's own UUID class, as shown below: javaCopycodeimportjava.util.UUID;publicclassUuidGenerator{publicstat
- Redis 1864 2023-06-03 10:14:27
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- How to use php+redis to implement optimistic locking
- header("content-type:text/html;charset=utf-8");$redis=newredis();$result=$redis->connect('127.0.0.1',6379);$mywatchkey=$redis- >get("");$rob_total=10;//Snap-up quantity if($mywatchkeywatch("mywatchkey");$redis->multi();//Set the delay to facilitate testing the effect. sleep(5);// Insert rush purchase data $redi
- Redis 1561 2023-06-03 10:09:45
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- How to install Redis on Linux system
- Introduction to redis: redis is an open source Key-Value database written in C language, supports network interaction, and can be memory-based or persistent. The official website address of redis is very easy to remember, it is redis.io. (I checked specifically and found that the domain name suffix io belongs to the national domain name and is britishIndianOceanterritory, which is the British Indian Ocean Territory) Currently, Vmware is funding the development and maintenance of the redis project. Features of redis: The reading speed of Redis is 110,000 times/s, and the writing speed is 81,000 times/s atom. All operations of Redis are atomic, and Redis also supports several operations
- Redis 2877 2023-06-03 10:05:20
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- How to monitor redis memory in zabbix
- 1. Download the import template directly and import the template through the following steps: Click configuration->templates>import->Import the downloaded xml file. 2. Configure the client key on the monitored host, open the /etc/zabbix/zabbix_agentd.conf configuration file, and add in the last line: UserParameter=redis_stats[*],redis-cli-h127.0.0.1-p$1info |grep$2|cut-d:-f2 After the configuration is completed, pass /etc/init.d/zabbix_agentdre
- Redis 1769 2023-06-03 10:00:04
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- How to use laravel redis cache
- Step 1: Install Redis First, you need to install Redis on the server. On Ubuntu, you can install it through the following command: sudoapt-getupdatesudoapt-getinstallredis-server. If you are using other operating systems, you can download relevant documents from the Redis official website. to install. Step 2: Configure Laravel to use Redis cache in the application. You need to make relevant configurations in Laravel's configuration file first. Open the config/cache.php file and find 'default'=>env(&#
- Redis 1135 2023-06-03 09:52:39
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- Docker+Redis+SpringBoot connection method
- After the Docker installation is successful, open dockerengine and add the domestic mirror "registry-mirrors": ["http://hub-mirror.c.163.com"]. To install the Redis mirror, enter https://hub.docker.com/. Search for redis and find the first official image. You can check how to start redis in the docker container. The related commands are as follows: dockerpullredis# pull the remote redis image dockerrun–namesome-redis-p6379:6379-d
- Redis 1461 2023-06-03 09:46:07
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- How to solve the Redis cache avalanche problem
- The cache layer carries a large number of requests and effectively protects the storage layer. However, if a large number of requests arrive at the storage layer due to a large number of cache failures or the entire cache cannot provide services, the load on the storage layer will increase (a large number of requests query the database). This is the scenario of cache avalanche; to solve the cache avalanche, you can start from the following points: 1. Keep the cache layer highly available using Redis sentry mode or Redis cluster deployment method. Even if individual Redis nodes go offline, the entire cache layer can still be used. . In addition, Redis can be deployed in multiple computer rooms, so that even if the computer room crashes, the cache layer can still be highly available. 2. Both the cache layer and the storage layer of the current limiting and downgraded components will have the probability of errors. They can be regarded as
- Redis 2213 2023-06-03 09:46:02
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- What is the specific method for remote connection to redis on Linux?
- Redis, the remote dictionary service, is an open source log-type Key-Value database written in ANSIC language, supports the network, and can be memory-based or persistent. Specific methods for Linux remote connection to redis Connect to remote redis-cli-h47.101.63.222-p56379 Connect to local redis-cli Set password configsetrequirepasspass_123456 Get password configgetrequirepass Login authpass_123456
- Redis 1827 2023-06-03 09:40:08
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- How to install a six-node cluster in Redis
- Introduction: rediscluster is a native cluster solution. Currently, it has made great progress in terms of high availability and stability. According to statistics and observations, more and more companies and communities are adopting the rediscluster architecture, which has become a de facto standard. Its main feature is decentralization and no need for proxy. One of the main design goals is to achieve linear scalability. The rediscluster server alone cannot complete the officially promised functions. In a broad sense, rediscluster should include both redis servers and client implementations such as jedis. They are a whole. Distributed storage is nothing more than
- Redis 1395 2023-06-03 09:19:28
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- What are the differences between redis and Memcached?
- Redis is a database, but unlike traditional databases, redis data is stored in memory, so the read and write speed is very fast, so redis is widely used in caching. memcached is a high-performance distributed memory cache server. The general purpose of use is to increase the speed and scalability of dynamic web applications by caching database query results and reducing the number of database accesses. Salvatore Sanfilippo, author of the authoritative comparison of Redis, once compared these two memory-based data storage systems: Redis supports server-side data operations: Compared with Memcached, Redis has more data structures and supports richer
- Redis 1507 2023-06-03 09:14:04
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- How to implement Redis data sharding
- Introduction to Twemproxy Twitter's Twemproxy is currently the most widely used on the market and is used to provide redis cluster services. Since redis is single-threaded, and the official cluster is not very stable and widely used. Twemproxy is a proxy sharding mechanism. As a proxy, Twemproxy can accept access from multiple programs, forward it to each Redis server in the background according to routing rules, and then return to the original route. This solution well solves the problem of the carrying capacity of a single Redis instance. Of course, Twemproxy itself is also a single point and needs to use Keepalived as a high-availability solution (or LVS). by Twempr
- Redis 1834 2023-06-03 09:05:25
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- What are the methods used by Go Redis client?
- Introduction: The bottom layer of go-redis and redigo is implemented by calling the universal Do method, but redigo: since the input is a universal type, you must remember the parameters and return values of each command, which is very unfriendly to use. The parameter type is a universal type. As a result, the parameter type cannot be checked during the compilation phase. Each command requires time to record the usage method, number of parameters, etc., which is costly to use; go-redis: refines the functions of each redis command, we only need to remember Command, for specific usage, you can directly check the application of the interface, and the cost of use is low; secondly, it unifies the data type according to the underlying type of redis, which can help check the parameter type during compilation and its response is uniformly Res.
- Redis 1201 2023-06-03 09:01:38
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- How to use opsForValue of RedisTemplate
- Use of the opsForValue() method in Redis 1. set(Kkey, Vvalue) adds a string type value, key is the key, and value is the value. redisTemplate.opsForValue().set("stringValue","bbb"); 2. get(Objectkey) gets the value corresponding to the key key. StringstringValue=redisTemplate.opsForValue().get("key")3. append(Kkey,St
- Redis 2397 2023-06-03 08:55:09
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