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Technical Articles

Database

Redis

How to read the source code of redis

The best way to understand Redis source code is to go step by step: get familiar with the basics of Redis. Select a specific module or function as the starting point. Start with the entry point of the module or function and view the code line by line. View the code through the function call chain. Be familiar with the underlying data structures used by Redis. Identify the algorithm used by Redis.

Apr 10, 2025 pm 08:27 PM

redis

How to solve data loss with redis

Redis data loss causes include memory failures, power outages, human errors, and hardware failures. The solutions are: 1. Store data to disk with RDB or AOF persistence; 2. Copy to multiple servers for high availability; 3. HA with Redis Sentinel or Redis Cluster; 4. Create snapshots to back up data; 5. Implement best practices such as persistence, replication, snapshots, monitoring, and security measures.

Apr 10, 2025 pm 08:24 PM

redis 数据丢失

How to log in remotely with redis

There are two ways to log in to Redis remotely: forwarding through SSH port: After creating an SSH channel locally, connect to the local port to log in. Use Redis Sentinel: Install Redis Sentinel, configure configuration files, start Sentinel, and connect to the Redis master node after accessing the management interface.

Apr 10, 2025 pm 08:21 PM

redis

How to solve high concurrency with redis

Redis provides a variety of high concurrency solutions: 1. Cluster sharding data to improve throughput and fault tolerance; 2. Replication ensures data availability and improves read performance; 3. Pipeline reduces network overhead and improves throughput; 4. Transactions ensure atomicity to prevent data inconsistencies; 5. Lua scripts reduce communication and improves performance; 6. Publish/subscribe to achieve efficient real-time data transmission; 7. Current limit protects the server from overload. When choosing a plan, the applicability of clustering, replication, pipelines, transactions, Lua scripts, publish/subscribe, and current limit should be considered based on needs.

Apr 10, 2025 pm 08:18 PM

redis 并发请求

How to implement multi-threading redis

Redis 4.0 introduces a multi-threading mechanism to improve concurrent processing capabilities and reduce latency. This architecture contains IO threads and worker threads that get requests from the queue and execute Redis commands. The advantages of multithreading include improving concurrent processing capabilities, reducing latency and improving resource utilization. But it should be noted that it may bring about data consistency problems, increased resource consumption and thread safety problems.

Apr 10, 2025 pm 08:15 PM

redis

How to start the server with redis

The steps to start a Redis server include: Install Redis according to the operating system. Start the Redis service via redis-server (Linux/macOS) or redis-server.exe (Windows). Use the redis-cli ping (Linux/macOS) or redis-cli.exe ping (Windows) command to check the service status. Use a Redis client, such as redis-cli, Python, or Node.js, to access the server.

Apr 10, 2025 pm 08:12 PM

linux python redis macos 系统安装

What to do if redis crashes

Redis downtime handling guide: Diagnostic problems: Check the process running status and log errors, and check the status through commands. Recover data: Recover from backup, AOF, or RDB files. Prevent data loss: Enable persistence, use replication, and configure automatic failover. Optimize performance: Adjust configuration, use modules, and monitor indicators. Avoid downtime: Update Redis, maintain hardware/OS, use load balancers, test regularly.

Apr 10, 2025 pm 08:09 PM

redis 数据丢失

How to use redis

Using the Redis Java library requires: 1. Add dependencies (Jedis 3.6.3); 2. Connect to the Redis server (specify host and port); 3. Perform basic operations (set/get values, check whether keys exist, delete keys); 4. Perform complex operations (hash tables, lists, collections, ordered collections); 5. Publish/subscribe to messages (using JedisPubSub); 6. Close the connection (Jedis.close()).

Apr 10, 2025 pm 08:06 PM

redis

How to clear data with redis

The following two methods can be used to clear data in Redis: FLUSHALL command: Delete all keys and values in the database. CONFIG RESETSTAT command: Reset all states of the database (including keys, values, and other statistics).

Apr 10, 2025 pm 08:03 PM

redis

How to start linux with redis

To start Redis on a Linux system: Install the Redis package. Enable and start the Redis service. Verify that Redis is running. Connect to the Redis server. Advanced options: Configure the Redis server. Set password. Use the systemd unit file.

Apr 10, 2025 pm 08:00 PM

linux redis centos

How to deal with full memory of redis

When Redis memory reaches its upper limit, it takes the following steps: Evict key-value pairs using an eviction strategy such as LRU, TTL, or Random Selection. Select the key-value pair to be evicted based on the key size, expiration time, and access frequency. Recycle memory space occupied by the evicted key-value pair. If the eviction still fails to free up sufficient memory, stop the client connection or reject new writes. Monitor memory usage and adjust eviction policy and memory size settings as needed.

Apr 10, 2025 pm 07:57 PM

redis 键值对

How to verify redis without authorization

Redis Unauthorized Verification refers to accessing the Redis server without a password. The verification steps include: obtaining the Redis server address and port; connecting with Telnet or Netcat; checking whether a Redis prompt is displayed; execute the info command to obtain server information; checking whether there is a response. A response means that the server is not authorized to access.

Apr 10, 2025 pm 07:54 PM

redis

How to make message middleware for redis

Redis, as a message middleware, supports production-consumption models, can persist messages and ensure reliable delivery. Using Redis as the message middleware enables low latency, reliable and scalable messaging.

Apr 10, 2025 pm 07:51 PM

redis

How to understand redis single thread

Redis adopts a single thread architecture. The advantages of single thread design are low latency, simplicity and easy management, and predictable behavior. In order to solve the performance limitations of single thread, Redis adopts optimization technologies such as non-blocking IO, multiplexing, event loops and asynchronous operations.

Apr 10, 2025 pm 07:48 PM

redis