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- How to deal with redis breakdown
- How to deal with Redis breakdown: Use distributed locks to lock to ensure that only one request is created; enable cache penetration policy to return default values or error messages; create keys asynchronously to avoid affecting main thread performance; preload hotspot keys; optimize Redis configuration to enhance stability; use Redis clusters to reduce the probability of breakdown.
- Redis 930 2025-04-10 21:54:01
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- How to implement redis ordered collection
- Redis Ordered Sets (ZSet) are implemented through hash tables and jump tables. The hash table stores elements and score mappings. The jump table sorts elements by score and maintains quick navigation pointers. It supports a variety of operations, including adding, deleting, updating scores, finding elements and getting rankings. The advantages include quick sorting and search operations, supporting multi-score sorting and efficient memory management.
- Redis 285 2025-04-10 21:51:01
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- How to use Redis Sentry Mode
- Redis Sentinel Mode is a high availability solution that enables failure detection and automatic failover by deploying Sentinel Servers. The steps to use include: deploying the Sentinel server, configuring the Redis instance, and starting the Sentinel server. Sentinel mode working principle: After detecting the failure of the master node, elect a new master node, configure a new master node, and complete failover. More than half of the factors are considered for sentry support, slave node availability, and data consistency. Advantages of Sentinel mode include automatic failure detection and high availability, while disadvantages include complex deployment and the need for additional resources.
- Redis 257 2025-04-10 21:48:01
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- How to check whether redis is started
- The easiest way to check whether Redis is started is to use the redis-cli command line tool, with the command: redis-cli -h <hostname> -p <portnumber>. In addition to redis-cli, you can also check whether Redis is started by checking the port, viewing the process, or using the Redis management tool.
- Redis 160 2025-04-10 21:45:02
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- What to do if the redis memory is full
- When Redis memory is full: Clean up unwanted data to increase memory size of Redis instances using persistence optimization data structures to reduce client connection monitoring and adjustment
- Redis 329 2025-04-10 21:42:02
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- How to use Redis multi-threading
- Redis supports multi-threaded operations to improve concurrency and throughput. Using the pubsub mechanism, messages can be sent and received between threads; through thread pools, pre-created threads can be efficiently allocated and managed. Notes include thread safety, using the same Redis instance, and avoiding excessive use of threads.
- Redis 379 2025-04-10 21:39:01
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- How to switch the master and slave mode of redis
- There are two methods for switching Redis master-slave mode: direct switching and Redis-Sentinel auxiliary switching. Direct switching requires manual operations, including deactivating the master server, syncing data, disassociating and connecting to new master nodes. Redis-Sentinel provides automatic switching, requiring additional configuration of Sentinel and failover elections. Both methods may cause short-term data unavailability during the switching period and should be backed up before the operation.
- Redis 773 2025-04-10 21:36:02
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- How to migrate data with redis
- Redis provides multiple data migration methods: Redis Replication: Enable replication function to synchronize data to the target server. Redis RDB Export and Import: Create an RDB file, copy it from the source server to the destination server, and then load it. Redis AOF Export and Import: Create an AOF file, copy it to the target server, enable AOF, and then rewrite the AOF file. Redis Sentinel: Monitors the source server and automatically fails over to the secondary server in the event of a failure. Other tools: Dump/Restore is used to create/load data snapshots, and Redis Migrate is used to migrate between different Redis versions
- Redis 843 2025-04-10 21:33:01
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- How to use Redis sentinel
- Redis Sentinel is a high availability solution for Redis services that ensures service availability by monitoring Redis instances and failover. It requires the Redis Sentinel and the sentinel.conf file is configured. Sentinel will continuously monitor the Redis instance and perform master-slave failover based on the voting results to ensure the continuous availability of the service.
- Redis 822 2025-04-10 21:30:02
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- How to implement distributed locking in redis
- Redis implements a distributed lock by setting a key value in the absence of the SETNX command: the SETNX command tries to acquire the lock, and if it is successful, the client will obtain the lock; set an expiration time for the lock to prevent deadlock; periodically renew the expiration time of the lock to ensure that the client holds the lock; when releasing the lock, delete the lock's key.
- Redis 261 2025-04-10 21:27:01
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- How to see if redis is started
- To determine whether Redis is started, you can: 1. Check whether the process exists; 2. Use redis-cli to connect to the Redis server.
- Redis 543 2025-04-10 21:24:02
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- How to use redis desktop
- Redis Desktop is a graphical Redis database management tool that provides the following functions: View key settings value Execute command management connection data export and import real-time data monitoring cluster management script editor
- Redis 449 2025-04-10 21:21:01
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- How to store data with redis
- Redis adopts a memory storage mechanism to store data in server memory, and supports data types such as strings, hash tables, lists, collections, and ordered collections. The data writing process includes data analysis, data type selection and data storage, while the data retrieval process includes data analysis, data search and data return. This mechanism brings extremely high performance, support for multiple data types and persistence.
- Redis 764 2025-04-10 21:18:01
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- How to read the redis version
- You can view the Redis version by using the INFO command to obtain server details, including the redis_version field. Use the --version option to view the redis-cli command line tool version. Use the docker inspect command to resolve the Docker image name, which contains the Redis version.
- Redis 981 2025-04-10 21:15:02
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- How to ensure atomicity of redis
- Redis ensures atomicity through the following methods: 1. Atomic operations 2. Multiple execution 3. Monitoring locks 4. Transaction log 5. Sentinel and master-slave replication to ensure atomicity in single key-value operations, transaction execution, data monitoring, failure recovery and disaster recovery.
- Redis 357 2025-04-10 21:12:01
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