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(1) Introduction to HyperLogLog HyperLogLog was added at Redis version 2.8.9. The HyperLogLog algorithm is an algorithm for cardinality statistics. It only takes 12 KB of memory per HyperLogLog key to calculate the cardinality of nearly 2^64 different elements.HyperLogLog is suitable for large data volumes because it is relatively ...

Introduction to 21.22 redis cluster Multiple redis nodes network interconnected, data sharing All nodes are master-slave (which can be multiple slaves), where services are never provided and only served as standby Processing multiple keys at once (such as mset/mget) is not supported because redis need to distribute keys evenly across nodes ...

String type is the simplest type, a key corresponds to a value, and Stirng type is binary safe. Redis String can contain any data, such as jpg images or serialized objects. Operation: 1,set Set the value corresponding to key to the value of String type. Example: Set a key-value pair of name=zhaojw, then get out the value of name, set name= ...

Link List of Redis underlying data structure I. Realization of Link List in Redis We all know how to insert and delete lists. If an element is inserted in the middle of an array, the memory address of all elements after that element moves backwards. Deleting is the same as inserting and deleting the last element of the data. Link list does n ...

Environment: Cent OS 7.0 (Virtual Machine Environment), Nginx 1.9.8, Redis 3.2.1 1. Background When using Nginx+Tomcat for load balancing, because Nginx distributes different requests to a Tomcat, Tomcat runs in different containers, because session s are out of sync or lost. 2. Installation and Configuration of Nginx 1. Nginx I ...

When we build distributed systems, we often need to control mutually exclusive access to shared resources. At this time, we are involved in the implementation of distributed locks (also known as global locks). Based on the current tools, we have a large number of ways of implementation, such as: Redis-based implementation, Zookeeper-based imple ...

MULTI, EXEC, DISCARD and WATCH are the basis of Redis transactions1. The MULTI command is used to open a transaction and always returns OK.After MULTI is executed, the client can continue to send any number of commands to the server, which will not be executed immediately, but will be placed in a queue. 2. When the EXEC command is invoked, all ...

The last article introduced the most basic method of C# manipulation of Redis, because I am learning, but also looking for information to learn, and then I write, understand, and have been supplementing, today to see a more advanced point of usage, for beginners Ha. Here I'm still using winform, or framwork 3.5. As you know from the previous b ...

Environmental preparation centos6.7 redis3.2.8 Installation steps Step 1: Download the redis 3.2.8 installation package https://redis.io/download Step 2: Decompress the compressed package to the middle/inner_dev_env/redis-3.2.8 [root@allere /inner_dev_env/redis-3.2.8]# pwd /inner_dev_env/redis-3.2.8 Step 3: Create a new directory: redi ...

Author: Li Hongxun, Front End Engineer, GE Digital Group scene Because of security considerations, data services do not have external IPS and ports on Predix, so we can only access app s deployed on Predix, which can cause some development inconvenience.For example, we may need to import local data into postgres, or we may want to look at ...