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What to do if redis crashes

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

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

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

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

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

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

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

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
How to use redis annotations

How to use redis annotations

Use the Redis annotation mechanism to simplify Redis interaction in Java code, providing the following annotation type: @Cacheable: Cache method returns a value @CachePut: Put the value into the cache after the method is executed @CacheableEvict: Clear the cache entry before and after the method is executed @EnableCaching: Enable cache support @RedisHash: Define Redis hash @RedisValue: Declare Redis value

Apr 10, 2025 pm 07:45 PM
redis
How to use redis session

How to use redis session

In web development, the steps to using Redis Session include: Installing the Redis service and language library. Configure the Redis server and set connection parameters. Create a Session handler class. Initialize the Session and set the Cookie. Read and write Session data through the Session handler. Destroy the session to clear the data. The advantages of Redis Session include: high performance, scalability, security, and availability.

Apr 10, 2025 pm 07:42 PM
redis 数据丢失 并发请求
What to do if the redis set operation fails

What to do if the redis set operation fails

How to resolve Redis SET operation failures: Upgrade memory or optimize the phasing strategy to resolve insufficient key space. Reset the key's survival time or use the SETEX command to create a key with survival time to resolve the issue where the key exists and the EXAT command is set. Split large values ​​or use data structures such as list/hash to solve the problem of value size exceeding the limit. Use transaction or SETNX commands to avoid setting conflicts. Check logs, restart the server, or optimize the configuration to resolve input/output errors.

Apr 10, 2025 pm 07:39 PM
redis 网络问题 键值对
How to set the redis queue

How to set the redis queue

The steps to set up a queue in Redis include: 1. Create a list; 2. Push items into the queue; 3. Eject items from the queue; 4. Get the queue length; 5. Block pop-up; 6. Block enqueue; 7. Delete the queue.

Apr 10, 2025 pm 07:36 PM
redis
How to turn off redis sentinel mode

How to turn off redis sentinel mode

To turn off Redis Sentinel mode, perform the following steps: Set down-after-milliseconds to 0 in the Sentinel configuration file. Delete the Sentinel configuration file. Delete the Sentinel data directory. Restart Redis service.

Apr 10, 2025 pm 07:33 PM
redis
How to read data from redis

How to read data from redis

To read data from Redis, you can follow these steps: 1. Connect to the Redis server; 2. Use get(key) to get the value of the key; 3. If you need string values, decode the binary value; 4. Use exists(key) to check whether the key exists; 5. Use mget(keys) to get multiple values; 6. Use type(key) to get the data type; 7. Redis has other read commands, such as: getting all keys in a matching pattern, using cursors to iterate the keys, and sorting the key values.

Apr 10, 2025 pm 07:30 PM
python redis 键值对

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