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Home

Technical Articles

Database

Redis

How to retrieve a range of members by their rank (index) using ZRANGE?

The ZRANGE command is used to obtain a subset from an ordered set based on the ranking of members, and the ranking starts at 0. When using it, specify the starting and end rankings (both included), such as ZRANGEplayers04 obtains the top 5 players; add WITHSCORES parameters to return scores at the same time; support negative indexes, such as ZRANGEplayers-3-1 obtains the last three members; suitable for scenarios such as ranking, paging, and real-time dashboards; note that no errors will be reported when processing index values ??beyond the range, and the results will be returned in ascending order by default.

Aug 26, 2025 am 04:49 AM

How Does Redis Scale Differently Than Traditional Databases?

Redisscalesdifferentlyfromtraditionaldatabasesthroughin-memoryoperations,sharding,andreplication.1)In-memoryoperationsallowRedistohandlehigh-speedread/writetasks.2)Shardingdistributesdataacrossmultipleinstancesforhorizontalscaling.3)Replicationensure

Aug 26, 2025 am 02:15 AM

redis database

What are some practical use cases for Redis Bitmaps?

RedisBitmapsareidealfortrackingbinarystatesatscale.1.Foruseractivitytracking,eachuser'sdailyloginisstoredasabitintheirkey,enablingefficientcomputationofstreaksandretention.2.Featureflagscanbemanagedbyassigningbitstousers,allowingfastandscalableA/Btes

Aug 25, 2025 pm 03:29 PM

Example

What is connection pooling and why is it important for Redis clients?

ConnectionpoolingisessentialforRedisclientsinhigh-trafficapplicationstoreduceoverhead,limitresourceusage,andimprovescalability.1.Itworksbyreusingasetofpre-establishedconnectionsinsteadofcreatingnewonesforeachrequest.2.Thisreducesnetworklatencyfromrep

Aug 25, 2025 pm 02:16 PM

What is read-only mode on replicas (replica-read-only)?

Adatabasereplicaissettoread-onlymodetopreventunintendedorunauthorizedwriteoperations,ensuringdataconsistencyacrossthereplicationsetup.Thismodeallowsreplicastoprocessonlyreadqueries,avoidingdatadriftbyblockinginserts,updates,ordeletesthatcouldleadtoco

Aug 25, 2025 pm 01:22 PM

copy read-only mode

What is the difference between EVAL and EVALSHA?

EVAL is used to send new scripts for the first time, and EVALSHA is used to perform cached scripts efficiently. EVAL sends a complete script every time, suitable for one-time or test scenarios; EVALSHA calls cached scripts through SHA1 hash to reduce bandwidth consumption, and is suitable for frequently executed scripts; if the hash is not cached when using EVALSHA, a NOSCRIPT error will be triggered, and then fallback to EVAL should be reloaded; Redis permanently caches scripts by default, and the cache must be cleared or reloaded when updating scripts to ensure that the latest version is used.

Aug 25, 2025 pm 12:06 PM

How to perform a live migration of data from one Redis instance to another?

Yes,Redisdatacanbemigratedbetweeninstanceswithoutdowntimebyfollowingalivemigrationprocess.1.PreparebothRedisinstancesbyensuringcompatibility,sufficientmemory,authentication/TLSsetup,anddisablingautomaticevictionpolicies.2.Performinitialsyncusingredis

Aug 24, 2025 pm 12:50 PM

redis data migration

How to set an expiration time (TTL) on a Redis key?

There are the following methods to set the TTL (survival time) of the Redis key: 1. Use the EXPIRE command, first create the key and then set the expired seconds, such as SETmykey "hello" followed by EXPIREmykey60; 2. Directly specify the EX or PX options in the SET command to set the expiration time of seconds or milliseconds respectively, such as SETmykey "hello" EX60; 3. Re-execute EXPIRE on the existing key with TTL to update the expiration time, and the old timer will be reset; 4. Use the PERSIST command to remove the TTL of the key to make it permanent; 5. Use the TTL or PTTL command to view the remaining survival time of the key, respectively

Aug 24, 2025 am 09:44 AM

redis ttl

When Should I Choose Redis Over a Traditional Database System?

ChooseRedisforspeedandreal-timeoperations;optfortraditionaldatabasesforcomplexqueryinganddataintegrity.1)Redisexcelsinscenariosrequiringminimallatencyandhigh-frequencyoperations,idealforcachingandreal-timedataprocessing.2)Traditionaldatabasesarebette

Aug 24, 2025 am 12:48 AM

What are lexicographical range queries on Sorted Sets?

Lexicographicalrangequeries are used in Redis to retrieve elements based on dictionary order of strings, not fractions. When using commands such as ZRANGEBYLEX, ZLEXCOUNT, etc., you must ensure that all members have the same scores, otherwise the results will be unpredictable. Common uses include implementing automatic completion, label filtering and dictionary search. Notes include binary security comparison, case sensitivity and performance impact. Correct settings can improve the efficiency of string range query.

Aug 24, 2025 am 12:03 AM

How to get only the keys or only the values from a hash? (HKEYS, HVALS)

In Redis, use the HKEYS and HVALS commands to get all keys or values ??in the hash respectively. 1) HKEYSkey_name is used to obtain all field names in the hash, return an array, without including values; 2) HVALSkey_name is used to obtain the values ??corresponding to all fields in the hash, and also returns an array; if the key does not exist or the hash is empty, both return an empty array; and the order of values ??returned by HVALS corresponds one by one to HKEYS. These two commands are suitable for scenarios such as data debugging, building cache indexes, and confirming content before cleaning data.

Aug 23, 2025 am 09:15 AM

How to debug a Lua script in Redis?

Debugging Lua scripts in Redis can be achieved through the following methods: 1. Use redis.log() to output log information to facilitate viewing key variables and logical branches, and pay attention to log levels and paths; 2. Test the script first through the EVAL command to ensure that the parameter passing and logic are correct; 3. Perform preliminary tests in the Lua environment that simulates Redis locally; 4. Use the Redis client library to load scripts and catch exceptions to assist in debugging. These methods can be combined to effectively improve debugging efficiency.

Aug 23, 2025 am 05:29 AM

redis lua

How Does Redis Compare to Traditional SQL and NoSQL Databases?

Redisisidealforspeedandsimplicity,SQLdatabasesforcomplexqueriesanddataintegrity,andNoSQLdatabaseslikeMongoDBforscalabilityandflexibilitywithlargerdatasets.1)Redisexcelsinread/writespeedduetoitsin-memorynature,suitableforcachingandreal-timeapplication

Aug 23, 2025 am 04:29 AM

What is Redis Sentinel and what is its main purpose?

RedisSentinel ensures high availability of Redis. Its core functions include: 1. Continuously monitor Redis master and slave nodes, judge faults through multi-sentinel voting mechanism to avoid missed switching; 2. Automatic failover, when the master node is unreachable, elect the slave node as the new master and reconnect the old master as the slave; 3. Provide client connection information, dynamically inform the current master node address, and reduce manual configuration. Through these mechanisms, the automation management and fault tolerance of the Redis system are realized.

Aug 23, 2025 am 01:35 AM