PHP Redis种
PHP Redis类

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Redis cluster mode deploys Redis instances to multiple servers through sharding, improving scalability and availability. The construction steps are as follows: Create odd Redis instances with different ports; Create 3 sentinel instances, monitor Redis instances and failover; configure sentinel configuration files, add monitoring Redis instance information and failover settings; configure Redis instance configuration files, enable cluster mode and specify the cluster information file path; create nodes.conf file, containing information of each Redis instance; start the cluster, execute the create command to create a cluster and specify the number of replicas; log in to the cluster to execute the CLUSTER INFO command to verify the cluster status; make

Redis uses hash tables to store data and supports data structures such as strings, lists, hash tables, collections and ordered collections. Redis persists data through snapshots (RDB) and append write-only (AOF) mechanisms. Redis uses master-slave replication to improve data availability. Redis uses a single-threaded event loop to handle connections and commands to ensure data atomicity and consistency. Redis sets the expiration time for the key and uses the lazy delete mechanism to delete the expiration key.

Steps to solve the problem that redis-server cannot find: Check the installation to make sure Redis is installed correctly; set the environment variables REDIS_HOST and REDIS_PORT; start the Redis server redis-server; check whether the server is running redis-cli ping.

Redis cluster is a distributed deployment model that allows horizontal expansion of Redis instances, and is implemented through inter-node communication, hash slot division key space, node election, master-slave replication and command redirection: inter-node communication: virtual network communication is realized through cluster bus. Hash slot: divides the key space into hash slots to determine the node responsible for the key. Node election: At least three master nodes are required, and only one active master node is ensured through the election mechanism. Master-slave replication: The master node is responsible for writing requests, and the slave node is responsible for reading requests and data replication. Command redirection: The client connects to the node responsible for the key, and the node redirects incorrect requests. Troubleshooting: fault detection, marking off line and re-

To view the Redis version number, you can use the following three methods: (1) enter the INFO command, (2) start the server with the --version option, and (3) view the configuration file.

To view all keys in Redis, there are three ways: use the KEYS command to return all keys that match the specified pattern; use the SCAN command to iterate over the keys and return a set of keys; use the INFO command to get the total number of keys.

Redis Ordered Sets (ZSets) are used to store ordered elements and sort by associated scores. The steps to use ZSet include: 1. Create a ZSet; 2. Add a member; 3. Get a member score; 4. Get a ranking; 5. Get a member in the ranking range; 6. Delete a member; 7. Get the number of elements; 8. Get the number of members in the score range.

Redis uses five strategies to ensure the uniqueness of keys: 1. Namespace separation; 2. HASH data structure; 3. SET data structure; 4. Special characters of string keys; 5. Lua script verification. The choice of specific strategies depends on data organization, performance, and scalability requirements.
