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How to clean all data with redis
How to clean all Redis data: Redis 2.8 and later: The FLUSHALL command deletes all key-value pairs. Redis 2.6 and earlier: Use the DEL command to delete keys one by one or use the Redis client to delete methods. Alternative: Restart the Redis service (use with caution), or use the Redis client (such as flushall() or flushdb()).
Apr 10, 2025 pm 05:06 PM
How to save list type redis
Redis uses an internal array to store the list type, each element in the array is a string value representing a member. Redis also maintains a counter to track the number of elements in the array. When using the LPUSH or RPUSH command, Redis updates the counter and inserts or appends new elements into the array. The LRANGE command returns members within the given range, LSET updates members at the specified index, and LREM removes members that match the given value. Redis's list type save method supports efficient insertion, deletion and search operations.
Apr 10, 2025 pm 05:03 PM
How to view the running status of redis
Check the Redis running status by using the Redis INFO command to obtain server statistics. Monitor Redis in real-time using monitoring tools such as RedisInsight, Prometheus, and Grafana. Check process information (ps aux | grep redis) to get CPU and memory usage. View the log file (tail /var/log/redis/redis.log) to find errors and warning messages. Use a dedicated command such as SENTINEL slaves mymaster to get specific instance information.
Apr 10, 2025 pm 05:00 PM
How to achieve high concurrency with redis
Redis achieves high concurrency through the following mechanisms: single-threaded event loop, I/O multiplexing, lock-free data structure, lazy deletion, pipelined, client connection pooling, and scalable to cluster mode.
Apr 10, 2025 pm 04:57 PM
How Redis supports high availability
Redis is a highly available distributed cache system that provides multiple mechanisms: master-slave replication: the master node stores data, synchronous replication to the slave node, improves read performance and achieves rapid failover. Sentinel: Monitor replication groups, and promote slave nodes to master nodes during failover. Cluster: A distributed system, each node stores part of data, achieving high availability and scalability. Client failover: The client automatically connects to the new master node after failover to improve availability.
Apr 10, 2025 pm 04:54 PM
How is the redis lock implemented
Redis locks are implemented by leveraging Redis's SETNX and DEL atomic operations, as well as single-threaded execution characteristics. It implements locking by setting key-value pairs, unlocks using DEL delete keys, and sets expiration time to avoid deadlocks. Redis locks are simple and easy to use, high performance, and distributed, but relying on Redis, they have a risk of single point of failure, and lock timeout may lead to inconsistent data.
Apr 10, 2025 pm 04:51 PM
How to implement session sharing with redis
Redis implements session sharing, using sticky sessions, implements read and write separation, and sets a session expiration mechanism to achieve high performance, scalability, fault tolerance and flexibility. Specific steps include: storing session data in the Redis hash table, setting sticky sessions, implementing read and write separation, setting up session expiration mechanisms, and using session middleware or frameworks.
Apr 10, 2025 pm 04:48 PM
How to implement the underlying data structure of redis
Redis implements various data types using the following underlying data structures: Hash table: Key-value pair storage jump table: Quick search for ordered data structures Dictionary tree: Prefix matching and autocomplete functions shaping array: Ordered integer storage compressed list: Compact storage of small strings and integer lists: Bidirectional linked lists, queues and stacks RDB/AOF files: Data persistence
Apr 10, 2025 pm 04:45 PM
How to replicate the redis cluster
Redis cluster replication is a data redundancy mechanism that uses the master-slave model to implement: the master instance handles writes and reads, sending data changes to the replica. The replica instance is only responsible for reading, receiving and storing data changes from the primary instance. Through the replication protocol implementation, the master instance tracks the replica status and sends database changes incrementally. Provides high availability, scalability, and data protection. Configuration includes selecting the primary instance, creating a replica, enabling replication, and monitoring the replication process.
Apr 10, 2025 pm 04:42 PM
What does redis pipeline mean
Redis Pipeline is a technology that batches Redis commands that reduce network overhead, improve throughput, and reduce latency. It is implemented by packaging multiple commands into a single request and sending them to the Redis server. Use the try-catch block when using Pipeline, limiting the number of commands and only when needed.
Apr 10, 2025 pm 04:39 PM
What does the redis instance mean
A Redis instance refers to a separate running process used to store and manage data. Each instance has its own configuration, data, persistence policies, and client connections. It can be used for use cases such as caching, message queueing, databases, and session management.
Apr 10, 2025 pm 04:36 PM
What does redis high availability mean?
Redis High Availability means that Redis clusters can still provide services in the event of failure or interruption, ensuring the complete and available data. The methods to achieve high availability of Redis are: master-slave replication: create multiple Redis slave nodes, and the master node is responsible for writing and copying data. Sentinel: Monitors the health status of Redis master and slave nodes. When the master node fails, the slave node will be automatically promoted to the master node. Redis Cluster: A distributed architecture that stores data shards on multiple Redis nodes. When the master node fails, the slave node will automatically take over the role of the master node. The benefits of high availability Redis clusters include: non-interruption of service, data integrity, scalability, and disaster recovery.
Apr 10, 2025 pm 04:33 PM
What does redis expiration time mean?
Redis expiration time allows setting a duration for the key after which the key and its value will be deleted. (1) Set the expiration time through the EXPIRE or PEXPIRE command. (2) Expiration time helps to free up storage space, avoid data obsolete, and manage queues. (3) You can use the TTL command to obtain the expiration time, and the PERSIST command cancels the expiration time.
Apr 10, 2025 pm 04:30 PM
How to view redis logs
Redis log files are usually located in /var/log/redis/redis-server.log or /<redis installation directory>\redis.log. You can view the logs using command line tools such as tail -f redis-server.log. The default log level is "verbose", which can be changed by modifying the redis.conf configuration file. Redis also supports log separation, allowing logging to multiple files.
Apr 10, 2025 pm 04:27 PM
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