[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"me":3,"catalog:en:database\u002Fredis-data-structures":4,"config":214},null,{"field_key":5,"field_name":6,"seniority":7,"topic_key":8,"topic_name":9,"spec_key":7,"spec_name":7,"locale":10,"cell_total":11,"field_total":12,"seniorities":13,"topics":17,"specs":115,"samples":129},"database","Database","","redis-data-structures","Redis Data Structures","en",75,2475,[14,15,16],"junior","mid","senior",[18,21,24,27,30,33,36,39,42,45,48,51,54,57,60,63,66,69,72,75,78,81,84,87,90,93,94,97,100,103,106,109,112],{"key":19,"name":20,"count":11},"backup-recovery","Backup Recovery",{"key":22,"name":23,"count":11},"data-modeling","Data Modeling",{"key":25,"name":26,"count":11},"indexing","Indexing",{"key":28,"name":29,"count":11},"mongodb-aggregation","Mongodb Aggregation",{"key":31,"name":32,"count":11},"mongodb-indexes-queries","Mongodb Indexes Queries",{"key":34,"name":35,"count":11},"mongodb-operations","Mongodb Operations",{"key":37,"name":38,"count":11},"mongodb-replication-sharding","Mongodb Replication Sharding",{"key":40,"name":41,"count":11},"mongodb-schema-modeling","Mongodb Schema Modeling",{"key":43,"name":44,"count":11},"mongodb-transactions-consistency","Mongodb Transactions Consistency",{"key":46,"name":47,"count":11},"mysql-indexes","Mysql Indexes",{"key":49,"name":50,"count":11},"mysql-innodb-transactions","Mysql Innodb Transactions",{"key":52,"name":53,"count":11},"mysql-operations","Mysql Operations",{"key":55,"name":56,"count":11},"mysql-query-optimization","Mysql Query Optimization",{"key":58,"name":59,"count":11},"mysql-replication-scaling","Mysql Replication Scaling",{"key":61,"name":62,"count":11},"mysql-types-constraints","Mysql Types Constraints",{"key":64,"name":65,"count":11},"nosql-models","Nosql Models",{"key":67,"name":68,"count":11},"performance-tuning","Performance Tuning",{"key":70,"name":71,"count":11},"pg-indexes","Pg Indexes",{"key":73,"name":74,"count":11},"pg-mvcc-vacuum","Pg Mvcc Vacuum",{"key":76,"name":77,"count":11},"pg-operations","Pg Operations",{"key":79,"name":80,"count":11},"pg-query-planning","Pg Query Planning",{"key":82,"name":83,"count":11},"pg-transactions-locking","Pg Transactions Locking",{"key":85,"name":86,"count":11},"pg-types-constraints","Pg Types Constraints",{"key":88,"name":89,"count":11},"query-optimization","Query Optimization",{"key":91,"name":92,"count":11},"redis-cluster-sharding","Redis Cluster Sharding",{"key":8,"name":9,"count":11},{"key":95,"name":96,"count":11},"redis-expiration-eviction","Redis Expiration Eviction",{"key":98,"name":99,"count":11},"redis-persistence","Redis Persistence",{"key":101,"name":102,"count":11},"redis-replication-sentinel","Redis Replication Sentinel",{"key":104,"name":105,"count":11},"redis-transactions-scripting","Redis Transactions Scripting",{"key":107,"name":108,"count":11},"replication-scaling","Replication Scaling",{"key":110,"name":111,"count":11},"security-access","Security Access",{"key":113,"name":114,"count":11},"transactions-isolation","Transactions Isolation",[116,120,123,126],{"key":117,"name":118,"count":119},"mongodb","MongoDB",450,{"key":121,"name":122,"count":119},"mysql","MySQL",{"key":124,"name":125,"count":119},"postgresql","PostgreSQL",{"key":127,"name":128,"count":119},"redis","Redis",[130,148,161,175,188,201],{"id":131,"topic":9,"difficulty":132,"body":133,"options":134,"correct_key":139,"explanation":147},"019f89ea-0596-71ed-a23f-fe5fe1d089df",1,"Which Redis data type is best suited for storing a simple counter, like a page view count?",[135,138,141,144],{"key":136,"text":137},"a","Hash",{"key":139,"text":140},"b","String",{"key":142,"text":143},"c","Set",{"key":145,"text":146},"d","List","Redis strings can hold integers and support atomic `INCR`\u002F`INCRBY` operations, making them the natural fit for counters. Hashes (a) are for multi-field objects, sets (c) for unique unordered collections, and lists (d) for ordered sequences — none offer atomic numeric increment directly on a single scalar value.",{"id":149,"topic":9,"difficulty":132,"body":150,"options":151,"correct_key":142,"explanation":160},"019f89ea-0596-7aec-b37c-0407c6bf4d15","```\nRPUSH tasks \"a\" \"b\" \"c\"\nLRANGE tasks 0 -1\n```\nWhat does `LRANGE tasks 0 -1` return?",[152,154,156,158],{"key":136,"text":153},"Only the first element, \"a\"",{"key":139,"text":155},"Only the last element, \"c\"",{"key":142,"text":157},"All elements: \"a\", \"b\", \"c\"",{"key":145,"text":159},"An error, because -1 is not a valid index","`LRANGE key start stop` supports negative indexes, where -1 means the last element. `0 -1` therefore spans the entire list, returning all elements in order: \"a\", \"b\", \"c\". Negative indexes are a normal, documented feature (d is wrong), and the range is not limited to one end (a, b).",{"id":162,"topic":9,"difficulty":163,"body":164,"options":165,"correct_key":136,"explanation":174},"019f89ea-0597-7304-ac96-12c721260141",2,"You need to store a user profile (name, email, age) under a single Redis key and be able to update just the `age` field without rewriting the whole object. Which data type fits best?",[166,168,170,172],{"key":136,"text":167},"Hash, with each profile field as a field-value pair inside it",{"key":139,"text":169},"String, storing the whole profile as a JSON blob and rewriting it on every update",{"key":142,"text":171},"List, appending a new profile version every time a field changes",{"key":145,"text":173},"Set, with each field-value pair as a set member","A hash maps field names to values under one key, so `HSET user:1 age 31` updates just that field with a single O(1) command, no need to read-modify-write the whole object. A JSON string (b) works but forces reading and rewriting the entire blob for any single-field change. A list (c) has no concept of named fields and would grow unbounded. A set (d) has no field-value structure and doesn't support partial field updates cleanly.",{"id":176,"topic":9,"difficulty":132,"body":177,"options":178,"correct_key":145,"explanation":187},"019f89ea-0597-7d51-a160-031da63449ab","What guarantee does a Redis Set (as opposed to a List) give you about its members?",[179,181,183,185],{"key":136,"text":180},"Members are always returned in the order they were inserted",{"key":139,"text":182},"Members are automatically sorted alphabetically",{"key":142,"text":184},"Members can appear more than once, like a list",{"key":145,"text":186},"Each member is unique — duplicates are automatically rejected","A Redis Set is an unordered collection of unique strings; adding the same member twice with `SADD` has no effect the second time. There is no insertion-order guarantee (a) and no automatic alphabetical sort (b, that's closer to a Sorted Set's score ordering, and even then it's by score, not alphabetically by default). Duplicates being allowed (c) is exactly what a Set prevents.",{"id":189,"topic":9,"difficulty":163,"body":190,"options":191,"correct_key":142,"explanation":200},"019f89ea-0598-741b-8e0f-ee8ba27d9b44","You want to build a live leaderboard where each player has a numeric score and you need to fetch the top 10 players ordered by score efficiently. Which data type is designed exactly for this?",[192,194,196,198],{"key":136,"text":193},"A plain String per player, then sort client-side in the application",{"key":139,"text":195},"A List, using `LPUSH` to keep scores roughly in order",{"key":142,"text":197},"A Sorted Set (ZSET), using the score as the ranking value",{"key":145,"text":199},"A Set, since scores don't need to be unique","A Sorted Set stores each member with a floating-point score and keeps members ordered by that score internally (via a skip list), so `ZRANGE`\u002F`ZREVRANGE` can fetch a top-N slice in O(log N + M). Plain strings (a) push all sorting work to the client and require fetching every player. A List (b) has no concept of score-based ordering — `LPUSH` only affects position, not rank. A Set (d) has no score at all, so ranking isn't possible.",{"id":202,"topic":9,"difficulty":132,"body":203,"options":204,"correct_key":136,"explanation":213},"019f89ea-0598-7c46-9dc0-69f2c7f10717","```\nSET counter 10\nINCR counter\nGET counter\n```\nWhat does the final `GET counter` return?",[205,207,209,211],{"key":136,"text":206},"\"11\"",{"key":139,"text":208},"\"10\"",{"key":142,"text":210},"An error, because INCR only works on keys created with INCR",{"key":145,"text":212},"\"101\", because INCR appends 1 as a character","`INCR` parses the string value as an integer and atomically increments it by 1, then stores the result back as a string. \"10\" becomes 11, stored as \"11\". `INCR` works on any string that holds a valid integer, regardless of how the key was created (c is wrong), and it performs numeric increment, not string concatenation (d is wrong).",{"fields":215,"seniorities":391,"interview_shapes":392,"locales":397,"oauth":399,"question_count":402,"coach_enabled":403,"jd_match_enabled":403},[216,241,261,278,302,315,324,343,365,372,378,385],{"key":217,"name_tr":218,"name_en":218,"sort":132,"specializations":219},"backend","Backend",[220,223,226,229,232,235,238],{"key":221,"name":222,"field":217},"general","Genel",{"key":224,"name":225,"field":217},"go","Go",{"key":227,"name":228,"field":217},"python","Python",{"key":230,"name":231,"field":217},"java","Java",{"key":233,"name":234,"field":217},"csharp","C#\u002F.NET",{"key":236,"name":237,"field":217},"nodejs","Node.js",{"key":239,"name":240,"field":217},"php","PHP",{"key":242,"name_tr":243,"name_en":243,"sort":163,"specializations":244},"frontend","Frontend",[245,246,249,252,255,258],{"key":221,"name":222,"field":242},{"key":247,"name":248,"field":242},"javascript","JavaScript",{"key":250,"name":251,"field":242},"typescript","TypeScript",{"key":253,"name":254,"field":242},"react","React",{"key":256,"name":257,"field":242},"vue","Vue",{"key":259,"name":260,"field":242},"angular","Angular",{"key":262,"name_tr":263,"name_en":263,"sort":264,"specializations":265},"fullstack","Fullstack",3,[266,267,268,269,270,271,272,273,274,275,276,277],{"key":221,"name":222,"field":262},{"key":224,"name":225,"field":217},{"key":227,"name":228,"field":217},{"key":230,"name":231,"field":217},{"key":233,"name":234,"field":217},{"key":236,"name":237,"field":217},{"key":239,"name":240,"field":217},{"key":247,"name":248,"field":242},{"key":250,"name":251,"field":242},{"key":253,"name":254,"field":242},{"key":256,"name":257,"field":242},{"key":259,"name":260,"field":242},{"key":279,"name_tr":280,"name_en":280,"sort":281,"specializations":282},"devops-cloud","DevOps \u002F Cloud",4,[283,284,287,290,293,296,299],{"key":221,"name":222,"field":279},{"key":285,"name":286,"field":279},"aws","AWS",{"key":288,"name":289,"field":279},"gcp","GCP",{"key":291,"name":292,"field":279},"azure","Azure",{"key":294,"name":295,"field":279},"kubernetes","Kubernetes",{"key":297,"name":298,"field":279},"terraform","Terraform",{"key":300,"name":301,"field":279},"linux","Linux",{"key":303,"name_tr":304,"name_en":304,"sort":305,"specializations":306},"ai-engineer","AI Engineer",5,[307,308,309,312],{"key":221,"name":222,"field":303},{"key":227,"name":228,"field":303},{"key":310,"name":311,"field":303},"llm-rag","LLM\u002FRAG",{"key":313,"name":314,"field":303},"mlops","MLOps",{"key":5,"name_tr":316,"name_en":6,"sort":317,"specializations":318},"Veritabanı",6,[319,320,321,322,323],{"key":221,"name":222,"field":5},{"key":124,"name":125,"field":5},{"key":121,"name":122,"field":5},{"key":117,"name":118,"field":5},{"key":127,"name":128,"field":5},{"key":325,"name_tr":326,"name_en":327,"sort":328,"specializations":329},"mobile","Mobil","Mobile",7,[330,331,334,337,340],{"key":221,"name":222,"field":325},{"key":332,"name":333,"field":325},"ios-swift","iOS (Swift)",{"key":335,"name":336,"field":325},"android-kotlin","Android (Kotlin)",{"key":338,"name":339,"field":325},"flutter","Flutter",{"key":341,"name":342,"field":325},"react-native","React Native",{"key":344,"name_tr":345,"name_en":346,"sort":347,"specializations":348},"security","Güvenlik","Security",8,[349,350,353,356,359,362],{"key":221,"name":222,"field":344},{"key":351,"name":352,"field":344},"appsec","AppSec",{"key":354,"name":355,"field":344},"offensive-pentest","Offensive \u002F Pentest",{"key":357,"name":358,"field":344},"cloud-security","Cloud Security",{"key":360,"name":361,"field":344},"devsecops","DevSecOps",{"key":363,"name":364,"field":344},"blue-team-incident","Blue Team \u002F Incident",{"key":366,"name_tr":367,"name_en":368,"sort":369,"specializations":370},"qa-test-automation","QA \u002F Test Otomasyonu","QA \u002F Test Automation",9,[371],{"key":221,"name":222,"field":366},{"key":373,"name_tr":374,"name_en":374,"sort":375,"specializations":376},"data-engineer","Data Engineer",10,[377],{"key":221,"name":222,"field":373},{"key":379,"name_tr":380,"name_en":381,"sort":382,"specializations":383},"game-dev","Oyun Geliştirme","Game Development",11,[384],{"key":221,"name":222,"field":379},{"key":386,"name_tr":387,"name_en":387,"sort":388,"specializations":389},"ml-engineer","ML Engineer",12,[390],{"key":221,"name":222,"field":386},[14,15,16],{"junior":393,"mid":395,"senior":396},{"questions":394,"median_sec":3},20,{"questions":394,"median_sec":3},{"questions":394,"median_sec":3},[398,10],"tr",[400,401],"google","github",21750,true]