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How to view the redis master-slave switch

How to view the redis master-slave switch

To view the Redis master-slave switching status, you can use the following methods: use the "INFO replication" command to view the master-slave replication status information, including node roles, master node addresses, and ports; use the Redis monitoring tool to view the cluster status, obtain user-friendly interfaces and detailed metrics; view log files, obtain detailed information about master-slave switching events.

Apr 10, 2025 pm 06:06 PM
redis
How to set the redis expiration policy

How to set the redis expiration policy

There are two types of Redis expiration strategies: periodic deletion and lazy deletion. Regularly delete actively scan the database in the background, immediately delete expired key-value pairs, saving memory space, but may affect performance. Lazy deletion is only deleted when the client accesses expired key-value pairs, which are low in performance overhead, but expired key-value pairs may continue to take up memory space. Applications should choose policies based on requirements, if required to delete immediately or performance is preferred. Optimization measures include the use of short TTL values, the distribution of data by Redis Cluster, and monitoring memory usage.

Apr 10, 2025 pm 06:03 PM
redis 键值对
How to resolve key conflicts with redis

How to resolve key conflicts with redis

Redis resolves key conflicts through the following mechanisms: 1. Atomicity: Ensure that write operations to a single key are either fully executed or not at all. 2. Queue: Put operations that write to the same key at the same time into the queue and execute in first-come, first-out order. 3. Exit policy: Delete the oldest or least important keys to make room for new keys. 4. Optimistic lock: The client performs a write after reading the key value. If the key value has changed, the write fails and retry.

Apr 10, 2025 pm 06:00 PM
redis
How to view the version number of redis

How to view the version number of redis

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.

Apr 10, 2025 pm 05:57 PM
redis
How to set the value of redis incr

How to set the value of redis incr

To set the value of the INCR command in Redis, just provide a key to increment, the syntax is: INCR key. For example, INCR counter increases the counter value from 0 to 1. In addition, you can also use the INCRBY command to increase any number, with the syntax: INCRBY key increment, where increment is the value to be added.

Apr 10, 2025 pm 05:54 PM
redis
How to synchronize database with redis

How to synchronize database with redis

Synchronizing Redis with a database includes the following steps: 1. Select the synchronization mechanism (Redis Sentinel, Redis Cluster, or external script); 2. Set up Redis (enable RDB persistence, configure slave libraries); 3. Set up the database (create tables, define triggers); 4. Configure the synchronization mechanism; 5. Initialize synchronization; 6. Continuous synchronization (monitorize changes and apply them to Redis).

Apr 10, 2025 pm 05:51 PM
redis 同步机制
How to implement serialization of redis

How to implement serialization of redis

Redis uses RDB and AOF to store data. RDB snapshots are generated quickly and take up little space, but they do not support incremental updates. AOF logs each command, supports incremental updates, but is slow and takes up a lot of space. It is generally recommended to use RDB and AOF to take into account both speed and data integrity.

Apr 10, 2025 pm 05:48 PM
redis 键值对
How to find keys with redis

How to find keys with redis

There are several ways to find keys in Redis: Use the SCAN command to iterate over all keys by pattern or condition. Use GUI tools such as Redis Explorer to visualize the database and filter keys by name or schema. Write external scripts to query keys using the Redis client library. Subscribe to keyspace notifications to receive alerts when key changes.

Apr 10, 2025 pm 05:45 PM
python redis 可视化数据
How to access redis remotely

How to access redis remotely

There are two ways to access Redis remotely: connect directly over the network and use the Redis client tool to connect to the Redis server. Through an SSH tunnel, create an SSH tunnel on the local machine, mapping the ports of the remote Redis server to the local port.

Apr 10, 2025 pm 05:42 PM
redis
How to use Redis and MySQL in combination

How to use Redis and MySQL in combination

Advantages of using Redis and MySQL in combination: Caching: Improves application performance and reduces queries to MySQL databases. Session Management: Reduces the burden on MySQL databases and improves scalability. Ranking and Queue: Store and quickly access data for better performance. Distributed lock: implements lightweight and efficient distributed locks.

Apr 10, 2025 pm 05:39 PM
mysql redis
How to solve concurrency with redis lock

How to solve concurrency with redis lock

Redis lock is a distributed lock mechanism that solves race conditions when concurrent access to shared resources. It is implemented by using the SETNX command, setting a key when the key does not exist to acquire the lock. Use the EXPIRE command to set an expiration time for the lock to prevent deadlocks. Use the DEL command to release the lock when the client completes access to the protected resource. Redis locks are lightweight, scalable, high-performance and easy to implement, providing an effective concurrency solution.

Apr 10, 2025 pm 05:36 PM
redis 并发访问
How to use redis queue

How to use redis queue

Redis Queue is an advanced queue system based on Redis data structures that provides an efficient messaging mechanism. Users can use Redis queues through the following steps: 1. Create a queue using the RPUSH command. 2. Enqueue message using the RPUSH command. 3. Use the LPOP command to dequeue messages. 4. Use the LLEN command to get the queue length. Other commands include LREM, LTRIM, BLPOP, and BRPOP. The advantages of Redis queues include high performance, reliability, blocking queues, easy-to-operate and easy-to-use APIs.

Apr 10, 2025 pm 05:33 PM
python redis
How redis supports distributed

How redis supports distributed

Redis implements distributed through the following methods: sharding: scattering data to multiple Redis instances; master-slave replication: copying the data of the master instance to multiple slave instances; cluster: multiple Redis instances form a cluster to store and maintain data set consistency; Sentinel: automatically performs failover to improve high availability and reliability; Redis proxy: acts as an intermediate layer between the client and Redis instance, simplifying interaction.

Apr 10, 2025 pm 05:30 PM
redis 分布式部署
How is the redis cluster implemented

How is the redis cluster implemented

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-

Apr 10, 2025 pm 05:27 PM
redis 分布式部署

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