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Technical Articles

Database

Redis

How does HSCAN work for iterating over hash fields?

HSCAN is a command in Redis for traversing hash fields, and its core advantage is that it supports incremental iteration to avoid blocking. 1) It implements batch processing by returning some fields and a cursor each time; 2) The basic syntax is HSCANkeycursor[MATCHpattern][COUNTcount], where the key is the hash name and the cursor starts from 0; 3) Compared with HGETALL, HSCAN is more suitable for processing large data volumes to prevent performance problems; 4) When using it, it should always start from cursor0, and use MATCH filtering and COUNT to adjust the batch size reasonably; 5) It is important to note that modifying the hash may affect the consistency of the scan result.

Aug 22, 2025 pm 02:51 PM

HSCAN

Install Redis: How to check the connection

TochecktheconnectiontoRedis,usethecommand"redis-cliping"andexpecta"PONG"response.1)Use"redis-cliinfo"togetdetailedserverstatus.2)AutomatecheckswithaPythonscriptformonitoring.3)Ensurefirewallsettingsallowaccesstoport6379.

Aug 22, 2025 pm 12:51 PM

What does the TYPE command do?

TheTYPEcommandisusedtodisplaythecontentsofatextfileinthecommandprompt.1.InWindowsCommandPrompt,useTYPEfilename.txttoviewthefile.2.CombinewithMOREtopreventscrolling:TYPEfilename.txt|MORE.3.Commonlyusedforcheckingconfigurationfiles,logs,ordebuggingscri

Aug 22, 2025 am 10:32 AM

ftp command TYPE命令

How does Redis compare to other databases like Memcached or MongoDB?

Redisisbestsuitedforin-memory,high-speedusecaseslikecachingandreal-timedataprocessing,outperformingMemcachedandMongoDBinspeedandadvanceddatastructures.Itsupportscomplexdatatypes,atomicoperations,andoptionalpersistencethroughRDBandAOF,makingitversatil

Aug 22, 2025 am 06:33 AM

How to move a member from one set to another using SMOVE?

The SMOVE command is used to move a member from one collection to another in Redis. The specific steps are as follows: 1. Provide the source set key, the target set key and the member to be moved; 2. If the member exists in the source set, remove and add it to the target set; 3. If the member does not exist or the source set is empty, the command has no operation; 4. If the target set does not exist, it will be automatically created; 5. The return value is 1 to indicate successful movement, and 0 to indicate no member was found. This command is suitable for managing user roles, task status updates, or inventory classification adjustments, ensuring the atomicity and consistency of data transfers.

Aug 21, 2025 am 09:04 AM

Why is the use of multiple databases discouraged in Redis Cluster?

The main reasons why RedisCluster does not support multiple databases include: 1. Use a sharding model to distribute data on multiple nodes, and each node only processes one logical database to ensure the simplicity of data distribution and expansion; 2. Maintaining multiple databases across nodes is complex and inefficient, affecting the consistency management of commands such as KEYS or FLUSHALL; 3. Simplify cluster management and improve performance through unified namespaces, and encourage the use of key naming conventions to replace multi-database functions.

Aug 21, 2025 am 06:56 AM

Multiple databases

What is the MONITOR command and why should it be used with caution?

Redis's MONITOR command is a powerful debugging tool, but it also has significant risks. 1. It will record and output all commands processed by the Redis server (such as GET, SET, DEL) in real time, which is suitable for troubleshooting abnormal behavior; 2. However, enabling MONITOR will cause a sharp increase in performance overhead, especially in high concurrency scenarios, which may cause service downgrades or even crashes; 3. At the same time, this command exposes all operation details, including sensitive data and key logic, bringing serious security risks; 4. It is recommended to only use it in a controllable environment for a short period of time, avoiding instances of use in production environments or processing sensitive data; 5. More secure alternatives include viewing Redis logs, analyzing slow query logs (SLOWLOG), and using monitoring tools such as

Aug 21, 2025 am 05:25 AM

How to rename a key safely using RENAME and RENAMENX?

To safely rename the Redis key, use RENAMENX should be preferred. RENAME will directly rename and overwrite the existing target key, which poses a risk of data loss; RENAMENX will only perform renaming when the target key does not exist, and returning 0 means failure; it is recommended to check whether the target key exists before operation, use RENAMENX in the production environment, combine Lua scripts to ensure atomicity, and backup original data to ensure security.

Aug 21, 2025 am 01:03 AM

rename RENAMENX

What is RediSearch or RedisJSON?

RediSearch and RedisJSON are two modules of Redis, which are used to enhance search and JSON data management respectively. RediSearch supports full-text indexing, filtering, sorting and aggregation, suitable for real-time search scenarios; RedisJSON supports native JSON storage and operations, suitable for processing nested structure data; the two can be used in combination to achieve efficient search of JSON content.

Aug 20, 2025 pm 04:47 PM

How do you stay updated with the latest features and best practices for Redis?

Maintaining knowledge of Redis’s latest features and best practices is the key to continuous learning and focus on official and community resources. 1. Regularly check Redis official website, document updates and ReleaseNotes, subscribe to the GitHub repository or mailing list, get version update notifications and read the upgrade guide. 2. Participate in technical discussions on Redis's Google Groups mailing list, Reddit sub-section, StackOverflow and other platforms to understand other people's experience and problem solutions. 3. Build a local testing environment or use Docker to deploy different versions for functional testing, integrate the Redis upgrade test process in CI/CD, and master the value of feature through actual operations. 4. Close

Aug 20, 2025 pm 02:58 PM

redis Best Practices

How Can I Verify That Redis Is Installed and Running Correctly on Linux?

RedisisinstalledandrunningcorrectlyonLinuxifyoucanverifyitsinstallation,checkitsservicestatus,andtestitsconnection.1)Useredis-server--versiontoconfirminstallation.2)Checkservicestatuswithsudosystemctlstatusredisorsudoserviceredisstatus.3)Connectviare

Aug 20, 2025 am 05:40 AM

How does transparent huge pages (THP) affect Redis performance?

TransparentHugePages (THP) usually has a negative impact on Redis performance. 1. THP reduces page table entries and improves TLB efficiency by using larger memory pages (such as 2MB or 1GB), and is suitable for applications with continuous memory allocation; 2. Redis's memory usage patterns (such as hash tables and linked lists) cause memory fragmentation, frequent small memory allocations and random access, which conflict with the THP mechanism; 3. THP may cause delay peaks in Redis, slower fork operations and higher CPU usage; 4. It is recommended to disable THP in production environments, and you can check /sys/kernel/mm/transparent_hugepage/enabl

Aug 19, 2025 pm 01:09 PM

How to increment the score of a member using ZINCRBY?

Toupdateamember'sscoreinaRedissortedset,usetheZINCRBYcommand.1.ZINCRBYtakesakey,anincrementvalue,andamembernametoadjustscores,creatingthememberifitdoesn'texist.2.Itsupportsnegativeincrementsfordecreasingscoresandhandlesedgecaseslikenon-existentmember

Aug 19, 2025 am 10:59 AM

What are Redis Streams and what problems do they solve?

RedisStreams is a data structure introduced by Redis 5.0, which is used to efficiently and reliably process log-type data. 1. It supports message persistence, consumer groups, confirmation mechanisms and message replay, and is suitable for event traceability and log storage, such as recording user operations or IoT data. 2. It can also serve as a lightweight message queue, supporting multiple consumers to independently read messages and perform task processing. 3. Compared with systems such as Kafka, it is integrated in Redis, suitable for low-latency scenarios without the need to introduce additional components, and provides fast read and write and optional persistence. Although it is not suitable for hyperscale data, it covers common stream processing needs.

Aug 19, 2025 am 10:50 AM