亚洲国产日韩欧美一区二区三区,精品亚洲国产成人av在线,国产99视频精品免视看7,99国产精品久久久久久久成人热,欧美日韩亚洲国产综合乱

Table of Contents
What Does Each Command Do?
When to Use Each One
Performance Considerations
Home Database Redis What is the difference between SUNION and SUNIONSTORE?

What is the difference between SUNION and SUNIONSTORE?

Sep 02, 2025 am 12:12 AM
redis Set operations

The main difference between SUNION and SUNIONSTORE is the way of processing results. 1. SUNION is used to return union elements of multiple collections, without modifying data, and is suitable for temporary viewing of results; 2. SUNIONSTORE stores union results in a new key, and is suitable for scenarios where persistent results are required. Both times have O(N), but SUNIONSTORE may have a greater impact on performance due to write operations. You should pay attention to memory usage and execution timing when using it.

What is the difference between SUNION and SUNIONSTORE?

SUNION and SUNIONSTORE are both Redis commands used to compute the union of multiple sets, but they serve slightly different purposes. The main difference lies in how they handle the result.

What Does Each Command Do?

SUNION returns the union of multiple sets as a list of elements. It doesn't modify your data—it's read-only in nature. You give it one or more set keys, and it gives you back all the unique elements across those sets.

For example:

 SUNION set1 set2

This would return all the distinct members from set1 and set2 .

SUNIONSTORE , on the other hand, takes the result of the union and stores it in a new key. This is useful when you want to persist the result for later use.

Example:

 SUNIONSTORE destination_set set1 set2

After this command runs, you'll have a new set called destination_set that contains the union of set1 and set2 .

One thing to note: if destination_set already exists, it will be overwritten.

When to Use Each One

Use SUNION when you just need to see the combined elements without saving them. It's great for quick checks or temporary results.

Use SUNIONSTORE when you want to save the union result for future operations. This avoids recalculating the union every time you need it.

  • If you're doing a one-time check → go with SUNION
  • If you're building a cached or computed dataset → use SUNIONSTORE

Also, keep in mind memory usage: storing large unions can take up space, so only use SUNIONSTORE when necessary.

Performance Considerations

Both commands have a time complexity of O(N), where N is the total number of elements in all the sets. So performance depends heavily on the size of your sets.

A few things to remember:

  • Running SUNION on very large sets can block the Redis server momentarily.
  • SUNIONSTORE writes data, so it may impact performance more than SUNION, especially if done frequently.
  • If you're using Redis in a production environment, consider running these during off-peak hours if dealing with huge datasets.

If you're working with massive sets and concerned about latency, test these commands in a staging environment first.

Basically that's it.

The above is the detailed content of What is the difference between SUNION and SUNIONSTORE?. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undress AI Tool

Undress AI Tool

Undress images for free

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

ArtGPT

ArtGPT

AI image generator for creative art from text prompts.

Stock Market GPT

Stock Market GPT

AI powered investment research for smarter decisions

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Hot Topics

How to use PHP combined with AI to achieve text error correction PHP syntax detection and optimization How to use PHP combined with AI to achieve text error correction PHP syntax detection and optimization Jul 25, 2025 pm 08:57 PM

To realize text error correction and syntax optimization with AI, you need to follow the following steps: 1. Select a suitable AI model or API, such as Baidu, Tencent API or open source NLP library; 2. Call the API through PHP's curl or Guzzle and process the return results; 3. Display error correction information in the application and allow users to choose whether to adopt it; 4. Use php-l and PHP_CodeSniffer for syntax detection and code optimization; 5. Continuously collect feedback and update the model or rules to improve the effect. When choosing AIAPI, focus on evaluating accuracy, response speed, price and support for PHP. Code optimization should follow PSR specifications, use cache reasonably, avoid circular queries, review code regularly, and use X

PHP realizes commodity inventory management and monetization PHP inventory synchronization and alarm mechanism PHP realizes commodity inventory management and monetization PHP inventory synchronization and alarm mechanism Jul 25, 2025 pm 08:30 PM

PHP ensures inventory deduction atomicity through database transactions and FORUPDATE row locks to prevent high concurrent overselling; 2. Multi-platform inventory consistency depends on centralized management and event-driven synchronization, combining API/Webhook notifications and message queues to ensure reliable data transmission; 3. The alarm mechanism should set low inventory, zero/negative inventory, unsalable sales, replenishment cycles and abnormal fluctuations strategies in different scenarios, and select DingTalk, SMS or Email Responsible Persons according to the urgency, and the alarm information must be complete and clear to achieve business adaptation and rapid response.

How to use PHP to develop a Q&A community platform Detailed explanation of PHP interactive community monetization model How to use PHP to develop a Q&A community platform Detailed explanation of PHP interactive community monetization model Jul 23, 2025 pm 07:21 PM

1. The first choice for the Laravel MySQL Vue/React combination in the PHP development question and answer community is the first choice for Laravel MySQL Vue/React combination, due to its maturity in the ecosystem and high development efficiency; 2. High performance requires dependence on cache (Redis), database optimization, CDN and asynchronous queues; 3. Security must be done with input filtering, CSRF protection, HTTPS, password encryption and permission control; 4. Money optional advertising, member subscription, rewards, commissions, knowledge payment and other models, the core is to match community tone and user needs.

How to use PHP to combine AI to generate image. PHP automatically generates art works How to use PHP to combine AI to generate image. PHP automatically generates art works Jul 25, 2025 pm 07:21 PM

PHP does not directly perform AI image processing, but integrates through APIs, because it is good at web development rather than computing-intensive tasks. API integration can achieve professional division of labor, reduce costs, and improve efficiency; 2. Integrating key technologies include using Guzzle or cURL to send HTTP requests, JSON data encoding and decoding, API key security authentication, asynchronous queue processing time-consuming tasks, robust error handling and retry mechanism, image storage and display; 3. Common challenges include API cost out of control, uncontrollable generation results, poor user experience, security risks and difficult data management. The response strategies are setting user quotas and caches, providing propt guidance and multi-picture selection, asynchronous notifications and progress prompts, key environment variable storage and content audit, and cloud storage.

How to use PHP to implement AI content recommendation system PHP intelligent content distribution mechanism How to use PHP to implement AI content recommendation system PHP intelligent content distribution mechanism Jul 23, 2025 pm 06:12 PM

1. PHP mainly undertakes data collection, API communication, business rule processing, cache optimization and recommendation display in the AI content recommendation system, rather than directly performing complex model training; 2. The system collects user behavior and content data through PHP, calls back-end AI services (such as Python models) to obtain recommendation results, and uses Redis cache to improve performance; 3. Basic recommendation algorithms such as collaborative filtering or content similarity can implement lightweight logic in PHP, but large-scale computing still depends on professional AI services; 4. Optimization needs to pay attention to real-time, cold start, diversity and feedback closed loop, and challenges include high concurrency performance, model update stability, data compliance and recommendation interpretability. PHP needs to work together to build stable information, database and front-end.

PHP integrated AI speech recognition and translator PHP meeting record automatic generation solution PHP integrated AI speech recognition and translator PHP meeting record automatic generation solution Jul 25, 2025 pm 07:06 PM

Select the appropriate AI voice recognition service and integrate PHPSDK; 2. Use PHP to call ffmpeg to convert recordings into API-required formats (such as wav); 3. Upload files to cloud storage and call API asynchronous recognition; 4. Analyze JSON results and organize text using NLP technology; 5. Generate Word or Markdown documents to complete the automation of meeting records. The entire process needs to ensure data encryption, access control and compliance to ensure privacy and security.

How to build an independent PHP task container environment. How to configure the container for running PHP timed scripts How to build an independent PHP task container environment. How to configure the container for running PHP timed scripts Jul 25, 2025 pm 07:27 PM

Building an independent PHP task container environment can be implemented through Docker. The specific steps are as follows: 1. Install Docker and DockerCompose as the basis; 2. Create an independent directory to store Dockerfile and crontab files; 3. Write Dockerfile to define the PHPCLI environment and install cron and necessary extensions; 4. Write a crontab file to define timing tasks; 5. Write a docker-compose.yml mount script directory and configure environment variables; 6. Start the container and verify the log. Compared with performing timing tasks in web containers, independent containers have the advantages of resource isolation, pure environment, strong stability, and easy expansion. To ensure logging and error capture

How to build a log management system with PHP PHP log collection and analysis tool How to build a log management system with PHP PHP log collection and analysis tool Jul 25, 2025 pm 08:48 PM

Select logging method: In the early stage, you can use the built-in error_log() for PHP. After the project is expanded, be sure to switch to mature libraries such as Monolog, support multiple handlers and log levels, and ensure that the log contains timestamps, levels, file line numbers and error details; 2. Design storage structure: A small amount of logs can be stored in files, and if there is a large number of logs, select a database if there is a large number of analysis. Use MySQL/PostgreSQL to structured data. Elasticsearch Kibana is recommended for semi-structured/unstructured. At the same time, it is formulated for backup and regular cleaning strategies; 3. Development and analysis interface: It should have search, filtering, aggregation, and visualization functions. It can be directly integrated into Kibana, or use the PHP framework chart library to develop self-development, focusing on the simplicity and ease of interface.

See all articles