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- How to implement redis lock
- Redis lock uses the Redis database to implement a mutex lock: the key is set atomically through the SETNX command, and no operation is performed if the key exists. Use the EXPIRE command to set the key expiration time. Delete the key after acquiring the lock to release the lock.
- Redis 565 2024-04-20 00:27:43
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- How to solve redis cache penetration
- Cache penetration refers to malicious users constantly querying data that does not exist in the database, resulting in performance degradation. Solutions include: setting default values, using bloom filters, using verification code mechanisms to limit traffic, slow query log analysis, and strengthening data verification.
- Redis 934 2024-04-20 00:26:18
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- What is redis cache penetration
- Cache penetration means that data not stored in the cache directly accesses the database, which can be solved through bloom filters, null value caching, and circuit breaker mechanisms.
- Redis 557 2024-04-20 00:18:31
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- The operation of redis is multi-threaded
- The multi-threading of Redis enables the Redis server to handle requests from multiple threads at the same time, improving concurrent processing capabilities and reducing latency. Redis achieves multi-threading by using I/O multiplexing technology, allowing a single thread to monitor multiple socket file descriptors and handle requests from multiple sockets at the same time.
- Redis 865 2024-04-20 00:12:23
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- Are redis operations atomic?
- Atomic operations: INCR, DECR, INCRBY, DECRBY, GETSET, SETNX. They are uninterruptible and either execute completely or not at all. Non-atomic operations: SET, SETEX, DEL. They may be interrupted, causing data inconsistency. Atomicity is crucial to guarantee data consistency, especially when multiple clients access the same data at the same time.
- Redis 1035 2024-04-20 00:09:15
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- The relationship between redis and database
- Redis and database are different data storage systems. Redis is an in-memory database that emphasizes high-performance reading and writing and flexible data structures, while the database is a persistent database that emphasizes data persistence and structured queries. Therefore, they can be used complementary, with Redis serving as a cache or temporary storage to accelerate database read and write operations and reduce database pressure.
- Redis 1121 2024-04-20 00:08:50
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- redis delete cached code
- Redis provides the following methods to delete the cache: DEL command: delete the cache value corresponding to the specified key UNLINK command: mark the key as deleted and delete it on the next restart FLUSHALL command: delete the cache value corresponding to all keys in the database FLUSHDB command: delete the cache value in the current database Cache values corresponding to all keys
- Redis 335 2024-04-20 00:00:31
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- How to solve the problem of redis deletion cache failure
- For the problem of Redis cache deletion failure, the reasons and solutions are as follows: The key does not exist: Use the EXISTS command to check whether the key exists. Wrong key type: Make sure the key is a string key. This can be checked using the TYPE command. Internal server error: Check the Redis log for troubleshooting. Connection error: Check if the Redis server is running and accessible. Timeout exception: Increase the timeout period of the DEL command. Client errors: Check client code and network. Access control: Make sure the client has delete permission. Cluster partitioning: ensures that all nodes are in sync with data. Other suggestions: Use transactions for efficiency, regularly clean up expired keys, monitor the Redis server, and enable logging for troubleshooting
- Redis 393 2024-04-19 23:54:27
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- What to do if redis fails to delete cache
- Reasons for Redis cache deletion failure include: key does not exist, key is locked, server is busy, network problems, configuration errors, data corruption, insufficient permissions. The countermeasures are: confirm the existence of the key, wait for the lock to be released, try again later or relieve the load, check the network connection, check the configuration, repair the data or restore the backup, and grant deletion permission. If the above measures don't work, you can check the Redis logs or contact the Redis support team.
- Redis 541 2024-04-19 23:53:03
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- redis clear all cache commands
- Redis clear all cache command: The FLUSHALL command will clear all key-value pairs in all databases in Redis. This command blocks the Redis server until the cleanup operation is completed. It is recommended to back up your data before using this command as it is a dangerous operation.
- Redis 1222 2024-04-19 23:50:11
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- What is redis? Briefly describe its advantages and disadvantages?
- Redis (Remote Dictionary Server) is an open source, in-memory data structure storage system that stores data based on key-value pairs. It has the advantages of high performance, low latency, high availability, rich data structure, and scalability. However, its disadvantages include data volatility, large memory footprint, concurrency limitations, lack of transaction support, and higher cost.
- Redis 729 2024-04-19 23:45:32
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- How to delete cache in redis
- There are four methods of deleting caches in Redis: direct deletion (DEL command), batch deletion (KEYS + UNLINK command), fuzzy deletion (SCAN + UNLINK command), and time-based expiration (TTL).
- Redis 945 2024-04-19 23:42:19
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- What is the principle of redis
- Redis is an in-memory database that uses a single-threaded architecture and complex data structures to achieve high performance and scalability. It supports data persistence and replication to ensure data security and availability.
- Redis 639 2024-04-19 23:39:25
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- redis clear cache command
- Use the FLUSHALL command to clear all cached data in Redis, delete all key-value pairs, and restore the database to its initial state. Other methods of clearing the cache include: deleting a single key-value pair (DEL), deleting a key-value pair without releasing memory (UNLINK), and setting a key-value pair expiration time (EXPIRE). The method chosen depends on the use case and the level of data loss allowed.
- Redis 555 2024-04-19 23:36:59
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- redis cache clearing instructions
- To clear all data in the Redis cache, you can use the command FLUSHALL, which will delete all key-value pairs stored in the cache, including: 1. Key-value pair data; 2. Expired key-value pair data.
- Redis 524 2024-04-19 23:34:37
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