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Redis: A Guide to Popular Data Structures

Redis: A Guide to Popular Data Structures

Redis supports a variety of data structures, including: 1. String, suitable for storing single-value data; 2. List, suitable for queues and stacks; 3. Set, used for storing non-duplicate data; 4. Ordered Set, suitable for ranking lists and priority queues; 5. Hash table, suitable for storing object or structured data.

Apr 11, 2025 am 12:04 AM
redis 数据结构
How to implement redis counter

How to implement redis counter

Redis counter is a mechanism that uses Redis key-value pair storage to implement counting operations, including the following steps: creating counter keys, increasing counts, decreasing counts, resetting counts, and obtaining counts. The advantages of Redis counters include fast speed, high concurrency, durability and simplicity and ease of use. It can be used in scenarios such as user access counting, real-time metric tracking, game scores and rankings, and order processing counting.

Apr 10, 2025 pm 10:21 PM
redis 并发请求 键值对
How to use the redis command line

How to use the redis command line

Use the Redis command line tool (redis-cli) to manage and operate Redis through the following steps: Connect to the server, specify the address and port. Send commands to the server using the command name and parameters. Use the HELP command to view help information for a specific command. Use the QUIT command to exit the command line tool.

Apr 10, 2025 pm 10:18 PM
redis
How to build the redis cluster mode

How to build the redis cluster mode

Redis cluster mode deploys Redis instances to multiple servers through sharding, improving scalability and availability. The construction steps are as follows: Create odd Redis instances with different ports; Create 3 sentinel instances, monitor Redis instances and failover; configure sentinel configuration files, add monitoring Redis instance information and failover settings; configure Redis instance configuration files, enable cluster mode and specify the cluster information file path; create nodes.conf file, containing information of each Redis instance; start the cluster, execute the create command to create a cluster and specify the number of replicas; log in to the cluster to execute the CLUSTER INFO command to verify the cluster status; make

Apr 10, 2025 pm 10:15 PM
redis 高可扩展性
How to read redis queue

How to read redis queue

To read a queue from Redis, you need to get the queue name, read the elements using the LPOP command, and process the empty queue. The specific steps are as follows: Get the queue name: name it with the prefix of "queue:" such as "queue:my-queue". Use the LPOP command: Eject the element from the head of the queue and return its value, such as LPOP queue:my-queue. Processing empty queues: If the queue is empty, LPOP returns nil, and you can check whether the queue exists before reading the element.

Apr 10, 2025 pm 10:12 PM
python redis
How to use redis cluster zset

How to use redis cluster zset

Use of zset in Redis cluster: zset is an ordered collection that associates elements with scores. Sharding strategy: a. Hash sharding: Distribute the hash value according to the zset key. b. Range sharding: divide into ranges according to element scores, and assign each range to different nodes. Read and write operations: a. Read operations: If the zset key belongs to the shard of the current node, it will be processed locally; otherwise, it will be routed to the corresponding shard. b. Write operation: Always routed to shards holding the zset key.

Apr 10, 2025 pm 10:09 PM
redis 键值对
How to clear redis data

How to clear redis data

How to clear Redis data: Use the FLUSHALL command to clear all key values. Use the FLUSHDB command to clear the key value of the currently selected database. Use SELECT to switch databases, and then use FLUSHDB to clear multiple databases. Use the DEL command to delete a specific key. Use the redis-cli tool to clear the data.

Apr 10, 2025 pm 10:06 PM
redis
How to set the redis expiration policy

How to set the redis expiration policy

There are two types of Redis data expiration strategies: periodic deletion: periodic scan to delete the expired key, which can be set through expired-time-cap-remove-count and expired-time-cap-remove-delay parameters. Lazy Deletion: Check for deletion expired keys only when keys are read or written. They can be set through lazyfree-lazy-eviction, lazyfree-lazy-expire, lazyfree-lazy-user-del parameters.

Apr 10, 2025 pm 10:03 PM
redis
How to set the redis log

How to set the redis log

Redis provides a variety of logging options, allowing the configuration of log levels and output locations: log levels: debug, verbose, notice, warning, and error, set in the loglevel parameters. Log output location: standard output, file, and system log, respectively set through logfile, syslog-enabled and syslog-ident parameters.

Apr 10, 2025 pm 10:00 PM
redis
How to release redis distributed lock

How to release redis distributed lock

To release a Redis distributed lock, follow these steps: 1. Acquire the identifier of the current holder of the lock; 2. Check whether it is the current holder; 3. Delete the lock. Other considerations, such as releasing locks before operating resources, and using transactions to improve security should also be considered.

Apr 10, 2025 pm 09:57 PM
redis
How to deal with redis breakdown

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.

Apr 10, 2025 pm 09:54 PM
redis
How to implement redis ordered collection

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.

Apr 10, 2025 pm 09:51 PM
redis
How to use Redis Sentry Mode

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.

Apr 10, 2025 pm 09:48 PM
redis
How to check whether redis is started

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.

Apr 10, 2025 pm 09:45 PM
redis

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