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Home

Technical Articles

Database

Redis

How do Redis Streams compare to message queues like RabbitMQ or Kafka?

RedisStreamsissuitableforlightweightin-memorystreamprocessingwithinRedis,whileKafkaexcelsinhigh-throughput,durablelogstorageandRabbitMQincomplexroutingandguaranteeddelivery.RedisStreamsworkswellforreal-timeanalyticsorsmalljobqueueswherespeedmatters,K

Jul 30, 2025 am 12:49 AM

message queue

Redis on Linux: common errors

RedisonLinuxmayfailtostartduetoconfigurationerrorsorinsufficientresources,encountermemoryissueswithlargedatasets,refuseconnectionsifnotlisteningonthecorrectinterfaceorport,andfaceauthenticationorperformanceproblems.1)CheckRedisstatuswith'sudosystemct

Jul 30, 2025 am 12:45 AM

What's the Best Way to Install Redis from Source on Linux?

The best way to install Redis is to install it from source. The steps are as follows: 1) Download the latest stable version of Redis; 2) Decompress and enter the directory; 3) Compile Redis; 4) Run the test suite; 5) Install to the system directory. This method allows custom configuration, optimize performance and ensure security, suitable for the needs of a specific environment.

Jul 30, 2025 am 12:39 AM

What is a hash slot in Redis Cluster?

RedisCluster uses hashslots to divide data between multiple nodes, with a total of 16384 slots. Each key is calculated by the CRC16 algorithm and the modulo of 16384 determines the slot, and then allocates it to different nodes by the cluster. 1. This mechanism facilitates expansion and rebalancing, avoiding large-scale data reorganization; 2. The number of slots is selected because it takes into account flexibility and efficiency, and is a power of 2 for quick calculation; 3. When expanding, load balancing can be achieved by migrating slots. The source node is marked as "migrating", the target node is marked as "importing", and the key is transferred one by one before the ownership is updated; 4. If the slots are unevenly distributed, it may cause the performance of hot spot nodes to affect the key names, and the key names need to be designed reasonably, regularly monitored and rebalancing with the reshard tool.

Jul 29, 2025 am 12:39 AM

What are Redis Modules and what can they do?

RedisModulesarepluginsthatextendRedisfunctionalitybyaddingnewcommands,datatypes,andcustomlogic.1.TheyallowhandlingJSONdocuments,full-textsearch,probabilisticstructures,andtime-seriesdata.2.PopularmodulesincludeRedisJSONfornativeJSONsupport,RediSearch

Jul 29, 2025 am 12:35 AM

Function Redis模塊

How does PSYNC (partial resynchronization) work?

PSYNC is a partial resynchronization mechanism in Redis master-slave replication, which is used to synchronize only data lost during disconnection after the slave server is disconnected to improve synchronization efficiency. Its core relies on the ReplicationBacklog, which is a queue maintained by the main server. The default size is 1MB and saves the most recently executed write commands. When the slave server reconnects, a PSYNC command will be sent, and the master server will determine whether partial synchronization can be performed based on this: 1. The runid must be consistent; 2. Offset must be in the backlog buffer. If the condition is satisfied, data will continue to be sent from the offset, otherwise full synchronization will be triggered. Methods to improve the success rate of PSYNC include: 1. Appropriately increase repl-b

Jul 29, 2025 am 12:27 AM

How to store and query geospatial data in Redis?

RedissupportsgeospatialdatastorageandqueriesviaitsGeodatatype.1.UseGEOADDtostorecoordinatesasmembersunderakey,withsyntaxGEOADDkeylongitudelatitudemember.2.QuerynearbylocationsusingGEORADIUS,whichreturnsmemberswithinaspecifiedradiusfromagivenpoint,opt

Jul 29, 2025 am 12:20 AM

How to disable dangerous commands like FLUSHALL?

To disable dangerous commands in Redis, the most direct way is to use the rename-command command in the redis.conf file; 1. Find the configuration file and add rename-commandFLUSHALL"" to completely disable the command; 2. You can choose to rename the command to a difficult-to-guess name to restrict access; 3. After modification, you need to restart the Redis service and back up the original configuration; 4. You can disable other high-risk commands such as FLUSHDB, KEYS and CONFIG in the same way; 5. It is recommended to combine firewall, password authentication (requirepass) and ACL permission management to improve security.

Jul 28, 2025 am 12:59 AM

redis Safety

What is a consumer group in Redis Streams?

Consumer groups solve the problem of message duplication by allowing multiple consumers to collaborate on reading the same data stream. 1. The consumer group ensures that each message is processed only once by one consumer in the group; 2. The consumer can confirm that it is successfully processed, and the unconfirmed messages can be reassigned; 3. Create a group using XGROUPCREATE, XREADGROUP reads the message, and the XACK confirmation process is completed; 4. The unconfirmed messages are stored in the PEL list, and can be viewed through XPENDING or transferred to the XCLAIM.

Jul 28, 2025 am 12:54 AM

How to delete one or more fields from a hash using HDEL?

The HDEL command is used to delete one or more fields from the Hash of Redis. The basic syntax is HDELkeyfield[field...]. For example, HDELuser:1000ageemail can delete the specified field; deleting a single or multiple fields only depends on the number of passed parameters, and if the field does not exist, no error will be reported; the return value indicates the number of fields successfully deleted, which is suitable for debugging; in actual applications, HEXISTS can be used to determine whether the field exists before deleting it, or atomic operations are implemented in Lua scripts to ensure security.

Jul 28, 2025 am 12:06 AM

What are Redis Functions in version 7?

RedisFunctionsinversion7solveissueswithtraditionalLuascriptingbyenablingmodular,reusableserver-sidelogic.1.Theyallowstructuredfunctiondefinitionforbetterorganizationandmaintainability.2.Theyimproveperformancethroughlazyloadingandcaching.3.Theysupport

Jul 28, 2025 am 12:05 AM

Redis vs Traditional DB: Is Redis expensive?

Rediscanbeexpensiveduetoitshighmemoryusage,butit'snotnecessarilymorecostlythantraditionaldatabases.1)Redis'sin-memorystoragerequiressignificantRAM,whichcanbepriceyforlargedatasets.2)Strategieslikepersistenceandevictionpolicieshelpmanagecosts.3)Tradit

Jul 27, 2025 am 01:48 AM

What is the 'TCP backlog' setting and why is it important?

TCPbacklog is an important setting when the server handles incoming connection requests. Its function is to serve as a queue waiting for a connection to be established. If it is set incorrectly, the connection will be discarded. It is divided into SYN queues and accept queues, which store semi-open connections and established connections that have not been accepted by the application, respectively. 1. Setting a backlog that is too small will cause connection failure when traffic surges; 2. It can be configured through the listen() function in the code, such as the Python example; 3. The Linux system is limited by /proc/sys/net/core/somaxconn; 4. It is recommended to select reasonable values based on the expected traffic and monitor connection errors; 5. Not all systems need to adjust, and the default value is suitable for low traffic.

Jul 27, 2025 am 01:38 AM

What is the difference between the EXPIRE and PEXPIRE commands?

ThedifferencebetweenEXPIREandPEXPIREinRedisisthetimeunitused.1.EXPIREsetsexpirationinseconds.2.PEXPIREsetsexpirationinmilliseconds,offeringfinercontrol.Forexample,toexpireakeyin1.5seconds,usePEXPIREwith1500.UseEXPIREforgeneralcasesandPEXPIREwhenhighe

Jul 27, 2025 am 01:04 AM