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Home

Technical Articles

Database

Redis

What Are the Security Considerations When Installing Redis on a Linux System?

To safely install Redis on Linux systems, the following measures should be taken: 1) Bind Redis to the local host (127.0.0.1); 2) Set a strong password; 3) Run Redis as a non-root user; 4) Use VPN or SSH tunnel to protect network connections; 5) Configure the firewall to allow only trusted source connections; 6) Use SSL/TLS to encrypt data transmission; 7) Disable protection mode and update Redis regularly; 8) Monitor Redis logs and set alerts. These steps help ensure Redis's security and reliability on Linux, protecting data and system integrity.

Aug 11, 2025 pm 10:37 PM

What is the difference between SPOP and SRANDMEMBER?

The main difference between SPOP and SRANDMEMBER is whether the original collection is modified. 1. SPOP is used to remove and return one or more random elements, which will change the original collection, which is suitable for scenes where elements need to be randomly selected and deleted; 2. SRANDMEMBER only returns one or more random elements without removing them, which is a read-only operation, which is suitable for cases where random values need to be sampled or viewed without modifying the collection; 3. Both support multiple elements through the count parameter starting from Redis3.2 and 6.2, but only SPOP will modify the collection content.

Aug 11, 2025 pm 07:33 PM

redis gather

What is the 'score' in a Sorted Set?

ThescoreinaRedisSortedSetisanumericalvaluethatdeterminestheelement'spositionwithintheset.Unlikeregularsets,whichareunordered,SortedSetsusescorestomaintainanautomaticorderfromsmallesttolargest.Eachmemberisassociatedwithascore,enablingdynamicrankingand

Aug 11, 2025 am 11:55 AM

score

What is Lua scripting in Redis?

Execution in Redis with Lua scripts has the advantages of atomicity, reducing network round trips, and simplifying application logic. The core reason is that multiple operations are encapsulated into a script through the EVAL or EVALSHA commands to ensure the atomic execution of operations and avoid race conditions; 1. Reduce the number of communications between the client and the server; 2. Make complex operation logic complete at one time on the server; 3. Improve performance and enhance code maintainability. Best practices should be followed when using: keep the script concise and fast, avoid large-scale loops, use local variables, test the scripts fully, and handle errors with caution. Not suitable for scenarios where external API calls, recalculation tasks, or multi-key cross-slot operations are required.

Aug 08, 2025 am 10:39 AM

How to benchmark Redis performance using redis-benchmark?

Redis's performance benchmark can be implemented through the official tool redis-benchmark. 1. Basic use: Run redis-benchmark-h127.0.0.1-p6379 to quickly test the default scenario; 2. Custom testing: Use -t to specify the command, -n to set the number of requests, and -c to set the concurrent number to simulate real load; 3. Fine control: Use -d to adjust the data size, and -P to enable pipeline batch sending commands to improve throughput; 4. Remote testing and analysis: Specify the remote IP and port, pay attention to the number of requests per second and delay distribution to evaluate performance.

Aug 08, 2025 am 04:29 AM

redis Performance Testing

What Data Structures Does Redis Offer That Traditional Databases Lack?

Redisoffersuniquedatastructureslikestrings,lists,sets,sortedsets,hashes,HyperLogLogs,bitmaps,andgeospatialindexes,whichtraditionaldatabasestypicallydon'thave.1)Stringssupportatomicoperationsforcounters.2)Listsfunctionasefficientqueuesorstacks.3)Setsm

Aug 08, 2025 am 02:44 AM

傳統(tǒng)數(shù)據(jù)庫

What is Redis and how does it differ from traditional databases?

Redisisanin-memorydatastoreusedasadatabase,cache,andmessagebroker,excellinginspeedandversatility.Itstoresdatainmemoryforfastperformance,supportsvariousdatastructures,andusesasimplecommandinterface,butlacksthedurabilityandcomplexquerycapabilitiesoftra

Aug 08, 2025 am 12:44 AM

What are the performance benefits of using Hashes for small objects?

Using hashing to store small objects can improve performance because it reduces memory overhead and speeds up access. When storing large amounts of small data, use hash to merge fields to a single key, thereby sharing metadata, reducing the overhead of each field. For example, using 100 values as a separate key requires 100 complete object headers and hash only requires one key header; in addition, hash supports reading and writing by field without loading the entire object, such as Redis, HGET commands that can obtain a certain field individually and reduce network bandwidth consumption; finally, many systems provide atomic operations such as HINCRBY for safe incremental counters to ensure reliability in concurrent environments.

Aug 07, 2025 pm 12:47 PM

Redis vs Traditional DB: easy guide

Redisisbetterforhigh-speeddataaccessandreal-timeprocessing,whiletraditionaldatabasesaremoresuitableforcomplexqueryinganddataintegrity.1)Forperformance,chooseRedisifspeediscritical;otherwise,optfortraditionaldatabasesforcomplexqueries.2)Fordatapersist

Aug 07, 2025 am 07:22 AM

How to check if a field exists in a hash using HEXISTS?

The HEXISTS command is used to check whether there is a specific field in the Redis hash, and returns 1 to indicate existence and 0 to indicate non-existence. Its syntax is HEXISTSkey_namefield_name, which is suitable for scenarios such as data verification, conditional logic and performance optimization. The operation complexity is O(1), which is efficient and stable, but it is only applicable to hash types. Pay attention to the difference between the use of other commands.

Aug 07, 2025 am 05:55 AM

Does Redis Pub/Sub guarantee message delivery?

RedisPub/Subdoesnotguaranteemessagedeliverybecauseitonlysendsmessagestoactivesubscribersinrealtime.1.Messagesarelostifsubscribersdisconnect,areslow,orrestartduringpublishing.2.Itissuitablefornon-criticalusecaseslikelivechatbutnotforreliabledatatransf

Aug 07, 2025 am 05:31 AM

redis messaging

How to get all fields and values from a hash using HGETALL?

HGETALL returns all fields and values in the hash table, and the results are presented in a flat list of alternating field values. For example: executing HGETALLuser:1 will return field value pairs such as "name", "Alice", "age", and "30" in turn. When using different clients, most libraries such as Python's redis-py, Node.js' ioredis, etc. will automatically convert the results into dictionaries or objects; if manually parsed, they need to be paired in order. Alternatives should be considered when facing large hashes, including using HSCAN paging to obtain, locally cache stable data, or splitting

Aug 06, 2025 am 04:29 AM

What is a Redis Sorted Set (ZSET) and how does it differ from a regular Set?

ARedisSortedSet(ZSET)isadatastructurethatstoresuniqueelements,eachassociatedwithascoretomaintainasortedorder.1.Elementsaresortedbytheirfloating-pointscoresinascendingorder.2.Membersareunique,butmultiplememberscanhavethesamescore,leadingtolexicographi

Aug 06, 2025 am 03:32 AM

How Can I Install Redis on a Linux System from Source?

InstallingRedisonLinuxfromsourceisbeneficialforaccessingthelatestfeaturesandunderstandingitsoperations.Stepsinclude:1)Installnecessarytoolswithsudoapt-getupdateandsudoapt-getinstallbuild-essential;2)DownloadthelatestRedisreleaseusingwgethttps://downl

Aug 06, 2025 am 02:00 AM