Redis hkeys. Don't use KEYS in your regular application code.

Redis hkeys Return Value List of keys with a matching pattern (Array). 3 Expiring keys When writing data into Redis, there may be a point at which data is no longer needed. Whether you‘re caching data or building a real-time service, this guide has you […] Oct 18, 2023 · Get to know the Redis database, iterate the keyspace and get all keys using KEYS and SCAN commands. But for developers new to Redis, understanding how to view and manage keys can be challenging. Sometimes, beginners ask, "What is the Redis command to get all available keys?" In simple terms, you can use the KEYS command. O (N) for a complete iteration, including enough command calls for the cursor to return back to 0. Make large dataset navigation simpler and faster. By default, FLUSHALL will Learn how to delete keys from Redis using the redis-cli command line tool by pattern. SCAN cursor [MATCH pattern] [COUNT count] [TYPE type] Available since: Redis Open Source 2. Up to 4,294,967,295 (232 - 1) field-value pairs can be stored in each hash. 0 Time complexity: O (N) where N is the number of keys that will be removed. Redis data types are closely related to fundamental data Redis stack extends the core features of Redis OSS like querying across hashes and JSON documents, time series data support, full-text search . ACL categories: @keyspace, @read, @slow, @dangerous Compatibility: Redis Enterprise and Redis Cloud compatibility Returns all keys matching pattern. Jul 18, 2022 · In Redis, the KEYS command returns all keys in the database matching a given pattern. Examples redis> HSET myhash field1 "Hello" Failed to fetch redis> HSET myhash field2 "World" Failed to fetch redis> HKEYS myhash Failed to fetch Jun 1, 2022 · Developers love Redis. Redis provides a couple of commands to help with this: KEYS and SCAN. 0 are the cursor based Redis iteration commands (SCAN, HSCAN etc) that let you iterate efficiently over billions of keys. Returns all field names in the hash stored at key. HKEYS key Available since: Redis Open Source 2. ACL categories: @read, @hash, @slow Returns all field names in the hash stored at key. Available since Redis 2. Maybe you’ve stored user sessions with keys like session:user123, session:user456, and so on — and now you want to find all keys that start with session:. While the time complexity for this operation is O(N), the constant times are fairly low. Removing a single key that holds a string value is O (1). This tutorial covers a naming convention for designing key names of a Redis database. As with any key-value database, the basic building block in Redis is the key. In this article, I will explain how this command works. Redis can replicate data to any number of Sep 6, 2019 · Introduction Redis is a data structure server that supports various values, however, it is not a simple key-value store. Sep 9, 2015 · Update: Though the suggestion above helps you get the desired output, the redis KEYS command is evil as the others mentioned. In this tutorial, you will learn how to select a database, move keys between Learn how to use Redis HKEYS command to fetch all the keys in a hash. May 18, 2022 · Download Nine Essential Database Capabilities and make sure your database has what it takes to meet all your demands Developing an application with Redis is a lot of fun, but as with any technology, there are a few points you should keep in mind while designing a Redis-based or Redis namespace application. For example, Redis running on an entry level laptop can scan a 1 million key database in 40 milliseconds. Each key in Redis maps to a corresponding value, and Redis supports various data types for values like strings, hashes, lists, sets, sorted sets, and more. ACL categories: @read, @hash, @slow Compatibility: Redis Enterprise and Redis Cloud compatibility Returns all field names in the hash stored at key. Nov 5, 2023 · Redis is one of the most popular in-memory data stores used by developers today. This is a powerful way to manage your data and free up space on your Redis server. Following Standard naming conventions are used for designing keys Key size: When we were given plain strings, it is difficult to understand and May 23, 2018 · Redis List Keys - How to get all keys from the Rredis command line (redis-cli). 8. 1:6379> HKEYS key Available versions> = 2. etc Redis is a Cache Server that stores key and value pairs. While the time Sep 14, 2023 · In Redis, keys are the fundamental data structure used to identify, store, and retrieve data. 0 Time complexity: O (N) where N is the total number of keys in all databases ACL categories: @keyspace, @write, @slow, @dangerous Compatibility: Redis Enterprise and Redis Cloud compatibility Delete all the keys of all the existing databases, not just the currently selected one. Jul 24, 2024 · Redis HKEYS Command Redis HKEYS command is used to get all field names in the hash stored at key. 13 Time complexity: O (N) where N is the number of arguments to the command ACL categories: @slow, @connection Compatibility: Redis Enterprise and Redis Cloud compatibility Returns Array reply of keys from a full Redis command. This Jan 30, 2023 · Redis is a key-value database that stores data in RAM, making it exceedingly efficient. Jun 3, 2020 · I have a very small data saved in Redis and the following is working as expected that will allow me to download all keys. A few commands, such as HKEYS, HVALS, HGETALL, and most of the expiration-related commands, are O (n), where n is the number of field-value pairs. Limits Every hash can store up to 4,294,967,295 (2^32 - 1) field-value pairs. Sep 5, 2023 · HVALS preferences:456 Output: 1) "dark" 2) "en" Time Complexity and Limits of Redis hashes: Generally, the time complexity for most of the Redis hash commands are O (1) only but a some commands such as HVALS, HGETALL, HKEYS are O (N), where N is the size of the input. Further - when dealing with clustered or sharded Dec 19, 2024 · Redis is an open-source, advanced key-value store and an apt solution for building high-performance, scalable web applications. 0 Time complexity: O (N) where N is the size of the hash. In practice, your hashes are limited only by the overall memory on the VMs hosting your Redis deployment. I want everything wiped out and give me a blank database. But was wondering if it is possible from redis-client. 0. This tutorial will cover the basics of how to list Redis keys and list all Mar 10, 2025 · Learn how to retrieve all keys in Redis efficiently. This comprehensive guide will teach you everything you need to know, including the syntax, examples, and common pitfalls. Understanding how to effectively work with keys is essential for tapping into […] Dec 13, 2023 · Here are a few examples of the usage examples of the Redis HKEYS command- # Redis HKEYS command examples # Set hash field/value 127. In this guide, we‘ll cover: What is Redis and how it stores data as key-value pairs Redis data structures like strings, hashes, lists, sets, sorted sets Commands to retrieve data from keys like GET, HGETALL, LRANGE etc Use Jul 24, 2024 · Redis Keys : pattern : Redis KEYS command is used to return all keys matching pattern. Oct 28, 2022 · Introduction Redis is an open-source, in-memory key-value data store. 0return valueContains a list of all fields in the ha I want to delete all keys. Redis provides a wide range of commands that work with keys to manage the keyspace, including the ability to remove keys, inspect key metadata, search for keys, and modify certain properties of keys. According to DB-Engines rankings, Redis is the most popular key-value store. The Key is a string Value is of data with predefined Redis Datatypes. Learn more Redis Redis Hkeys 命令 Redis 哈希 (Hash) Redis Hkeys 命令用于获取哈希表中的所有域（field）。 语法 redis Hkeys 命令基本语法如下： redis 127. Here are some common uses and scenarios for the "HKEYS" command: Field Enumeration: List all the field names in a hash for inspection or processing. . In this comprehensive guide, we’ll explore multiple techniques to retrieve, display and work with keys in Redis, a […] Nov 5, 2022 · The Redis HKEYS command returns all fields in the hash stored at the specified key. So if you're ready to take your Redis skills to the next level, read on! 3. A key is the unique name of a piece of data (which could be a String, a List, Hash, or any of the other redis data types) within a database. You’re probably already familiar with relational database development, but while many Jul 22, 2023 · Iterating over keys Sets and hashes Cluster and Ring Delete keys without TTL Monitoring Performance Iterating over keys It's not recommended to use the KEYS prefix:* command to get all the keys in a Redis instance, especially in production environments, because it can be a slow and resource-intensive operation that can impact the performance of the Redis instance. Redis is an extremely fast and flexible in-memory key-value database that has seen tremendous growth in popularity over the past decade. May 11, 2024 · Ultimate guide to Redis keys and databases from Hostman. I will also show you some examples and discuss a few important points before using it in production. In this comprehensive guide, we‘ll dive deep into how to delete Redis keys by leveraging prefixes, wildcards, and other techniques. Unlock the full potential of the Redis database with Redis Enterprise and start building blazing fast apps. SET key value [NX | XX | IFEQ ifeq-value | IFNE ifne-value | IFDEQ ifdeq-digest | IFDNE ifdne-digest] [GET] [EX seconds | PX milliseconds | EXAT unix-time-seconds | PXAT unix-time-milliseconds | KEEPTTL] Available since: Redis Open Source 1. Instead, you can iterate over Welcome fellow developer! Redis has become one of the most popular open source tools for building high-performance distributed systems. 0 Time complexity: O (1) ACL categories: @write, @string, @slow Compatibility: Redis Enterprise and Redis Cloud compatibility Set key to hold the string Redis Hash The Redis Hkeys command is used to get all fields in the hash table. Syntax The syntax goes like this: HKEYS key So all we do is pass the name of the key to the command. 4 Hashes As introduced in chapter 1, HASHes in Redis allow you to store groups of key-value pairs in a single higher-level Redis key. The 9th element in the reply of COMMAND (and COMMAND INFO) is an array that consists of the command's key specifications. Keys are never interpreted as… well, anything: they are simply inert names. Learn how to manage databases and delete keys in Redis. Mar 9, 2011 · Is there a Redis command for fetching all keys in the database? I have seen some python-redis libraries fetching them. N is the number of elements inside the collection. Any given Redis instance includes a number of databases, each of which can hold many different keys of a variety of data types. In this comprehensive guide, we‘ll dig deep into Redis GET, KEYS, namespaces, best practices, use cases and everything in between. Learn how to efficiently retrieve all keys in Redis using simple commands. redis-cli keys * Is there any way to get the keys+values *? Keys, Values and Channels In dealing with redis, there is quite an important distinction between keys and everything else. A key specification describes a DEL key [key ] Available since: Redis Open Source 1. ACL categories: @keyspace Redis is an incredibly fast and flexible in-memory data store known for its wide adoption. They may seem similar at first glance, but they behave Redis KEYS command is used to search keys with a matching pattern. @return @array-reply: list of fields in the hash, or an empty list when key does not exist. Jun 5, 2025 · 🔍 Redis KEYS * vs SCAN — What’s the Real Difference? If you’re working with Redis and need to retrieve keys, you’ve probably come across two commonly used commands: KEYS * and SCAN. Docs → Develop with Redis → Quick starts → Redis FAQ Redis FAQ Commonly asked questions when getting started with Redis How is Redis different from other key-value stores? Redis has a different evolution path in the key-value DBs where values can contain more complex data types, with atomic operations defined on those data types. Find out how to get all keys in Redis with UltaHost! Docs → Develop with Redis → Redis reference → Command key specifications Command key specifications What are command key specification and how to use them in your client Many of the commands in Redis accept key names as input arguments. # KEYS Returns all keys matching `pattern`. Returns all field names in the hash stored at key. The data object associated with a Feb 8, 2013 · COMMAND GETKEYS command [arg [arg ]] Available since: Redis Open Source 2. Redis has a relatively rich set of data types compared to many key-value data stores. Originally released in 2009, Redis has seen incredible growth thanks to its versatility, performance, and simple but powerful data structures. Understand key/value pairs, namespaces, and best practices for key management. Many people use Redis for caching and fast data retrieval. A key-value data store is a type of NoSQL database in which keys serve as unique identifiers for their associated values. Redis keys commands are used for managing keys in Redis. Feb 25, 2025 · Redis is a popular in-memory data store. @examples HSET myhash field1 "Hello" HSET myhash field2 "World" HKEYS myhash KEYS pattern Available since: Redis Open Source 1. When a key to remove holds a value other than a string, the individual complexity for this key is O (M) where M is the number of elements in the list, set, sorted set or hash. Jan 27, 2024 · Learn how to list all Redis keys efficiently and understand their usage in this comprehensive guide. 1:6379> HKEYS key 可用版本 >= 2. Redis Keys Standard Naming Conventions. Explore key commands, performance tips, and best practices to avoid slowing down your database. Docs → Develop with Redis → Using Redis commands → Keys and values Keys and values Managing keys in Redis: Key expiration, scanning, altering and querying the key space Every data object that you store in a Redis database has its own unique key. For your specific case, the start using HSCAN instead of HKEYS/HGETALL. ## Examples HSET myhash field1 "Hello" HSET myhash field2 "World" HKEYS myhash ## Return information Performance Most Redis hash commands are O (1). Redis has three main peculiarities that set it apart: Redis holds its database entirely in the memory, using the disk only for persistence. Its ability to quickly delete key subsets by prefix or wildcard pattern makes Redis a versatile tool for many use cases. The KEYS command is intended for debugging and special operations, such as changing your keyspace layout. This command never fails. Oct 14, 2021 · This article demonstrates how to get the list of all Redis keys through Jedis in an efficient manner. String keys are typically associated to string values in traditional key-value stores. ACL categories: @keyspace, @read, @slow Compatibility: Redis Enterprise and Redis Cloud compatibility The SCAN Learn how to 'get all keys with prefix' in Redis in 3 easy steps. Data Analysis: Analyze or debug the structure and contents of a hash. Redis HKEYS command is used to get all field names in the hash stored at the key. 27704 longitude -115. If you're looking for a way to find keys in a subset of your keyspace, consider using SCAN or sets. This data grouping can be thought of as being […] Develop with Redis Libraries and tools Redis products Commands FUNCTION STATS GEOADD GEODIST GEOHASH GEOPOS GEORADIUS GEORADIUS_RO GEORADIUSBYMEMBER GEORADIUSBYMEMBER_RO GEOSEARCH GEOSEARCHSTORE GET GETBIT GETDEL GETEX GETRANGE GETSET HDEL HELLO HEXISTS HEXPIRE HEXPIREAT HEXPIRETIME HGET HGETALL HGETDEL HGETEX HINCRBY HINCRBYFLOAT HKEYS FLUSHALL [ASYNC | SYNC] Available since: Redis Open Source 1. Examples # HKEYS Returns all field names in the hash stored at `key`. 115868 Nov 5, 2023 · Welcome fellow developer! Redis is an incredible technology for blazingly fast data access, but properly understanding keys and values can be tricky. Is there a way to do this in Redis client?. Following is the syntax for using redis keys commands. 0 Time complexity: O (1) for every call. However, the value is not limited to a simple string in Redis, but is able to hold more complex data structures. Docs → Develop with Redis → Redis for AI and search → Redis Query Engine → Search concepts → Key and field expiration behavior Key and field expiration behavior How the Redis Query Engine handles expiring keys and hash fields The Redis Query Engine behavior with expiring keys and hash fields has been enhanced starting with Redis 8 to provide more consistent and predictable results 3. Keys are used to set, retrieve, and delete data from the Redis server. grammar The basic syntax of the redis Hkeys command is as follows:redis 127. We can remove the data explicitly with DEL, or if we want to remove an entire key after a specified timeout, we can use what’s known as expiration. Jun 26, 2025 · When working with Redis, you’ll often find yourself needing to retrieve keys that follow a certain pattern. 7. 0 Time complexity: O (N) with N being the number of keys in the database, under the assumption that the key names in the database and the given pattern have limited length. **Warning**: consider `KEYS` as a command that should only be used in production environments with extreme care. It may ruin performance when it is executed Redis keys standard naming conventions size, namespace, separator used for designing keys for better readable, maintainable, and faster lookups. 0 返回值 包含哈希表中所有域（field）列表。 当 key 不存在时，返回一个空列表。 实例 redis 12. Functionally, the values offer some of the same features as values in STRINGs and can be useful to group related data together. COMMAND GETKEYS is a helper command to let you find the keys from a full Redis command Dec 27, 2023 · Redis is an extremely fast in-memory key-value store known for its flexibility and powerful data structures. […] Commands HKEYS HKEYS Syntax HKEYS key Available since: 2. In this comprehensive guide, we‘ll really dive deep on how to list and retrieve keys from […] Learn how to easily retrieve Redis keys and values using the command prompt with our step-by-step guide and expert tips. The key is a string that you pass to Redis commands to retrieve the corresponding object or modify its data. Don't use KEYS in your regular application code. When we say that a key has […] Available since 2. KEYS is blocking and can consume a lot of RAM while preparing the response. The Redis keyspace can be thought of as a hash table or dictionary mapping keys to data structures in the database. 1:6379> hset customer:1786:address street "6414 Losee Rd" city "North Las Vegas" state "North Carolina" zip "89086" phone "(702) 399-9939" country "United States" latutude 36. ppr atalml kdetwq gzs vboss ngtphk lqyyr bxyil xzago bwijn ecdhejt xbkw pjdi rqfhr ksdhd