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How to implement redis lock

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.

Apr 20, 2024 am 12:27 AM
redis
How to solve redis cache penetration

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.

Apr 20, 2024 am 12:26 AM
redis
What is redis cache penetration

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.

Apr 20, 2024 am 12:18 AM
redis
The operation of redis is multi-threaded

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.

Apr 20, 2024 am 12:12 AM
redis
Are redis operations atomic?

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.

Apr 20, 2024 am 12:09 AM
redis
The relationship between redis and database

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.

Apr 20, 2024 am 12:08 AM
redis 并发请求
redis delete cached code

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

Apr 20, 2024 am 12:00 AM
redis
How to solve the problem of redis deletion cache failure

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

Apr 19, 2024 pm 11:54 PM
redis 超时异常 网络问题
What to do if redis fails to delete cache

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.

Apr 19, 2024 pm 11:53 PM
redis 网络问题
redis clear all cache commands

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.

Apr 19, 2024 pm 11:50 PM
python redis 键值对
What is redis? Briefly describe its advantages and disadvantages?

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.

Apr 19, 2024 pm 11:45 PM
redis 内存占用 键值对
How to delete cache in redis

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).

Apr 19, 2024 pm 11:42 PM
python redis 数据丢失
What is the principle of redis

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.

Apr 19, 2024 pm 11:39 PM
redis 数据丢失 键值对
redis clear cache command

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.

Apr 19, 2024 pm 11:36 PM
redis 数据丢失 键值对

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