teleren/devto huggingface dataset:
Manager Handbook for Distributed AntDB-T - P8
Tags: database
Published: 2023-08-04 09:18:14

#### adbmgr promote

---


**Command function:**

In the NODE table, change the status of the node with the specified name to master, delete the master information of the node, and update the parameter information of the node in the PARAM table. This command is mainly used in the subsequent step-by-step processing of FAILOVER errors. The specific functions can be viewed through the help command `\h adbmgr promote`.

**Command format:**

```
ADBMGR PROMOTE { GTMCOORD | DATANODE } SLAVE node_name
```

**Command example:**

```sql
-- Update the status of datanode slave datanode1 to master in the node table and param table on the adbmgr side: 
ADBMGR PROMOTE DATANODE SLAVE datanode1; 
```

#### promote

---


**Command function:**

Perform a PROMOTE operation on the node to change the read-only state of the standby to a read-write state, and view the result as f by SELECT PG\_IS\_IN\_RECOVERY(). This command is mainly used in the subsequent step-by-step processing of FAILOVER errors. The specific functions can be viewed through the help command`\h promote gtmcoord`” or `\h promote datanode`。

**Command format:**

```
PROMOTE DATANODE { MASTER | SLAVE } { node_name } 
PROMOTE GTMCOORD { MASTER | SLAVE } { node_name } 
```

**Command example:**

```sql
-- Promote datanode slave datanode1 to read/write state: 
PROMOTE DATANODE SLAVE datanode1; 
-- Promote gtmcoord slave gc1 to read/write state: 
PROMOTE GTMCOORD SLAVE gc1; 
```

#### rewind

---


**Command function:**

Perform rewind operation on GTMCOORD or DATANODE standby to reestablish the correspondence between the standby and the host.

Both the rewind and append commands can be used to create a standby, but they are used in different scenarios.

The append command executes the pg\_basebackup command to synchronize data from the master node, requiring the data directory of the standby node to be empty, i.e., reinitialize a standby node. It is more time consuming if the master node has a large amount of data.

If the data directory of the backup node is not empty, for example, after the failover command is executed, the original master node is demoted to the backup node, but there is already a large amount of data in the data directory, so you can use the existing data in the directory to synchronize a small amount of data, which is less time consuming. This is exactly what rewind can do to quickly restore the backup node.

**Command format:**

```
REWIND DATANODE SLAVE { node_name } 
REWIND GTMCOORD SLAVE { node_name } 
```

**Command example:**

```sql
-- Rebuild the relationship between the standby datanode slave datanode1 and master: 
REWIND DATANODE SLAVE datanode1; 
-- Rebuild the relationship between the standby gtmcoord slave gc1 and master.
REWIND GTMCOORD SLAVE gc1; 
```
Error: TypeError: 'process.env' only accepts a configurable whileinstall windows-build-tools
Published: 2023-08-04 09:03:25


![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/iul0379vg97gvbwzvj8p.png)
Downloading installers failed. Error: TypeError: 'process.env' only accepts a configurable, writable, and enumerable data descriptor.

I have run this command **npm install --global windows-build-tools**

Node version : v 18.17.0 NPM version : 9.6.7
How does Git store the version history of a project?
Tags: git
Published: 2023-08-04 09:01:13

📝 _This post is part of my [“Shorts”](https://poddarayush.com/shorts) series, where each post is concise and hyper-focused on a single concept._

In an [earlier post discussing the history of Git](https://poddarayush.com/posts/history-of-git/), we discussed how most version control systems stored only the changes that were made from one version to next. When they had to recreate a particular version of a file, they merely added all the patches from the first version until the desired version. This is commonly called as **delta-based version control**.


![Storing data as changes](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/au6bkh4oipwntd4sqxhb.png)



However, Git differs from them in the way it stores the versions. It does not store the versions in the form of changes/patches.

Git - Storing data like a series of snapshots
-------------------------------------------

With each Git commit, Git creates a snapshot of the current state of the repository and stores it (technically, it just stores a reference to the snapshot). So, in a way, Git stores multiple copies of your project - each copy pointing to a version.

### What is the benefit of storing the versions as snapshots?

One of the major benefits of storing the version data this way is the ability to create branches very easily. We will cover this in more detail when we discuss **Git branching** in a later post.

### But, isn’t this wasting a lot of storage?

In a way, yes. But it is trading off storage (which is cheaper) for ease of use and better collaboration abilities.

Also, in order to be efficient if a file has not changed in a commit, Git just stores a link to the previous snapshot of the file.


![Storing data as snaps](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/geusfr0o7w2gs5zai6wv.png)



Sources
-------

*   [https://git-scm.com/book/en/v2/Getting-Started-What-is-Git](https://git-scm.com/book/en/v2/Getting-Started-What-is-Git%3F)
Boost Your React App Performance with React.lazy and Suspense!
Tags: react, javascript, webdev, performance
Published: 2023-08-04 08:58:42


---
title: Boost Your React App Performance with React.lazy and Suspense!
published: true
description: A beginner-friendly guide on how to improve your React app performance using React.lazy and Suspense.
tags: react, javascript, webdev, performance
---

## Table of Contents
1. [Introduction](#introduction)
2. [What is React.lazy?](#whatisreactlazy)
3. [Basic Usage of React.lazy](#howtousereactlazy)
4. [Combining React.lazy with Suspense](#usingreactlazywithsuspense)
5. [Conclusion](#conclusion)

---

## <a name="introduction"></a>1. Introduction

Hello, fellow React developers! When working on a large-scale application, performance can be a real headache. That's where React.lazy and Suspense come in handy. In this post, I'll introduce you to the wonders of React.lazy and Suspense.

## <a name="whatisreactlazy"></a>2. What is React.lazy?

React.lazy is a feature of React that allows you to delay the loading of components. This can significantly improve performance during initial load times.

## <a name="howtousereactlazy"></a>3. Basic Usage of React.lazy

Using React.lazy is incredibly simple. Here's some code to illustrate:

```jsx
// Component that will be loaded lazily
const OtherComponent = React.lazy(() => import('./OtherComponent'));

function MyComponent() {
  return (
    <div>
      <OtherComponent />
    </div>
  );
}
```

In this code, `OtherComponent` is loaded lazily using React.lazy. This means it's only loaded when it's needed for display.

## <a name="usingreactlazywithsuspense"></a>4. Combining React.lazy with Suspense

Additionally, React.lazy can be combined with a feature called Suspense. This allows you to display alternative content (like a loading screen) while your component is loading.

```jsx
// Component that will be loaded lazily
const OtherComponent = React.lazy(() => import('./OtherComponent'));

function MyComponent() {
  return (
    <div>
      <React.Suspense fallback={<div>Loading...</div>}>
        <OtherComponent />
      </React.Suspense>
    </div>
  );
}
```

In this code, while `OtherComponent` is loading, "Loading..." will be displayed. Once `OtherComponent` is loaded, it will be displayed.

## <a name="conclusion"></a>5. Conclusion

Using React.lazy and Suspense can greatly improve the performance of your React apps. If you're working on a large-scale application, be sure to utilize these features!

---

That concludes our guide on the basics of React.lazy and Suspense. If you have any further questions, feel free to ask in the comments section. If you found this post useful, please give it a thumbs up. Stay tuned for more posts aimed at making your React development more fun and productive. Happy coding!
```

Please ensure you adjust the `tags` metadata to match the topic of your blog post. The provided tags are just suggestions and should be customized to your post.
The GraphOS Studio Explorer
Tags: graphos, graphql, graphqlstudio
Published: 2023-08-21 02:33:31

---
title: The GraphOS Studio Explorer
published: true
date: 2023-08-04 08:58:25 UTC
tags: GraphOS, Graphql, GraphqlStudio
canonical_url: https://eplus.dev/the-graphos-studio-explorer
---

* * *

1. One-click query building in Explorer

[![One-click query building in Explorer](https://github.com/hoangsvit/graphql-studio/raw/main/assets/img/1.gif)](https://graphql-studio.eplus.dev/)

Typing out GraphQL queries by hand is time-consuming at best and a frustrating minefield of confusing paths, missed brackets, and incorrect variables at worst. Explorer offers no-code query-building to eliminate syntax errors and help you be more productive. Of course, if you still need to add hand-written code, you can do just that with Explorers editor with query linting and autocomplete.

1. + K field and path search

[![ + K field and path search](https://github.com/hoangsvit/graphql-studio/raw/main/assets/img/2.gif)](https://graphql-studio.eplus.dev/)

Your graph may be very deep and have thousands of fields and types. You know what data youre looking for but the more your graph scales, the more difficult it becomes to navigate the graph to get there. Explorers + K intelligent search shows you all of the possible paths to a field or type. Choose the path you want to use, and our one-click query builder will add your query to the sandbox without writing a single line of code.

1. Flexible response formatting Once youve built your query, Explorer shows you the response in an interactive JSON or table format with collapsible sections and data sorting by clicking on table headers. You can also copy the response to your clipboard, download it as a CSV, or download the JSON.

2. Explore and test your local GraphQL server

Just because youre working on your schema locally doesnt mean that you shouldnt have the best tools for the job. You can point Sandbox at any local GraphQL server and use it just as easily as other tools like GraphiQL or GraphQL Playground with zero setup. If you want to, you can even use Sandbox with production GraphQL APIs, although introspection needs to be enabled, and APIs that enforce CORS will need to allow our URL. That being said, here are a few public endpoints that you can try with Sandbox:

- [https://graphql-studio.eplus.dev/?endpoint=https://rickandmortyapi.com/graphql](https://graphql-studio.eplus.dev/?endpoint=https://rickandmortyapi.com/graphql)

- [https://graphql-studio.eplus.dev/?endpoint=https://graphql-demo.mead.io](https://graphql-studio.eplus.dev/?endpoint=https://graphql-demo.mead.io)

- [https://graphql-studio.eplus.dev/?endpoint=https://demo.saleor.io/graphql/](https://graphql-studio.eplus.dev/?endpoint=https://demo.saleor.io/graphql/)

1. No login required You can use the Schema Reference and Explorer in Sandbox with your GraphQL endpoint just by going to [graphql-studio.eplus.dev](https://graphql-studio.eplus.dev). Youll never have to create an account or log in, though if you do we can show you your query history and open up some additional customization settings.
Application Uploader is a IOS development assistant
Tags: ios
Published: 2023-08-04 08:57:57

Application Uploader is a IOS development assistant, in windows, Linux or MAC system environment, help developers to quickly and easily generate IOS development certificate, does not need the keys Application assistant, Uploader can upload screenshots and upload the IPA file to App Store, do not need the application launcher and MAC computer. IOS is an auxiliary tool for supporting developers. #software function




1、Create iOS certificate and configuration file

Application Uploader Support for the creation of a variety of Apple certificate, and the creation process is very simple, simply enter the certificate name, create mail and other information to create a certificate

2、Submit Mac in Windows, Linux or Ipa

With Application Uploader, you can upload one or more IPA files to the App Store in windows, MAC, or Linux system environments.

3、Batch upload screenshots and update APP information

Submit a screenshot to the itunesconnect is a very troublesome thing, had to upload dozens of screen shots, repeat boring. Application Uploader can be packaged upload screenshots.

4、Update multiple IOS applications at a time

Use the Application Uploader tool to update multiple iOS App at a time.

5、Template update

Use templates to update the app keyword, title, description, screen or other application information quickly and easily.

#Essential information Tool Name: Application Uploader

Tool size: 54.7M

Operating environment: windows, MAC or Linux

Interface language：Englis

#Tool download http://www.applicationloader.net/
![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/098p9nm554ohq36sh0it.png)
The Benefits of Lionel Messi Coloring Pages for Kids
Tags: lionelmessi, coloringpageswk
Published: 2023-08-04 08:54:55

Coloring pages have always been a popular activity for kids - it not only helps to pass the time, but it also helps to develop various skills such as hand-eye coordination, color recognition, and focus. And when it comes to coloring pages, there's no shortage of options available out there. However, when you're looking for something that's a little more engaging and interesting for your child, Lionel Messi coloring pages may be the perfect solution. These pages provide hours of fun for kids while also helping them to learn more about their favorite football star and the sport of football.

1. Develop Creativity Skills: One of the primary advantages of [Lionel Messi coloring pages](https://coloringpageswk.com/sports/lionel-messi/) is that it helps to develop your child's creativity skills. Children can use various colors and patterns to decorate each image as they want, and in the process, they can express their imagination and ideas. Additionally, it can enable them to use their creativity to develop new ideas in other areas.

2. Improve Concentration and Focus: Filling in a coloring page is a great way for kids to improve their concentration and focus. As they color each image, they need to have the discipline required to complete the picture, and this skill can be easily applied in other activities like sports or academics.

3. Learn about Lionel Messi's Achievements: Lionel Messi is one of the most celebrated footballers of all time, and coloring pages featuring him can be a great way for kids to learn more about his achievements and contributions to the world of football.

4. Learn more about Football: Football is an exciting sport, and coloring pages can teach kids a lot about the game. They can learn about the different positions played on the field, the various types of kicks in the sport and some of the rules of the game.

5. Boost Self-Esteem: Coloring pages with Lionel Messi can also improve your child's self-esteem. As they color each sheet, they will appreciate their work and feel proud of what they have created. This sense of accomplishment can be beneficial for their self-confidence and esteem.

Conclusion

In conclusion, Lionel Messi coloring pages are an excellent way for kids to enjoy their free time and develop their creative, cognitive, and artistic abilities. It allows children to learn more about their favorite footballer and the sport he plays while also offering some other benefits. As parents, you can easily find plenty of printable downloads with a simple click and start coloring with your child today. It's an easy and pain-free way to incorporate fun and education into your child's daily routine.
Power Up Your CSS! Visualizing Form Validation with :has() Selector
Tags: css, webdev, html, formvalidation
Published: 2023-08-04 08:45:29

---
title: "Power Up Your CSS! Visualizing Form Validation with :has() Selector"
published: true
description: "Learn how to utilize the CSS :has() pseudo-class to provide visual feedback on form validation."
tags: CSS,WebDevelopment,HTML,FormValidation
---

## Table of Contents
1. [Introduction](#introduction)
2. [Understanding the CSS :has() Pseudo-class](#has-pseudo-class)
3. [Visualizing Form Validation](#visualizing-form-validation)
4. [Points to Note](#caution)
5. [Conclusion](#conclusion)

## <a name="introduction">1. Introduction</a>

In the realm of web development, form validation plays a critical role. It ensures that user input adheres to expected formats, thereby preventing the submission of improper data. Providing visual feedback on these validation results can enhance user experience.

In this article, we will demonstrate how to visualize form validation results using the CSS `:has()` pseudo-class.

## <a name="has-pseudo-class">2. Understanding the CSS :has() Pseudo-class</a>

The `:has()` is a pseudo-class in CSS that matches if any of the selectors it is passed as parameters match at least one element. 

```css
a:has(> img) {
  border: 1px solid black;
}
```

In the example above, the `<a>` tags that directly contain an `<img>` tag as a child will be selected and applied with a black border.

## <a name="visualizing-form-validation">3. Visualizing Form Validation</a>

We can use the following CSS code to visualize the validation results of `<input>` elements within an HTML `<form>` element.

```css
form:has(input:invalid) {
     background: red; 
}

form:not(:has(input:invalid)) {
     background: green 
}
```

1. `form:has(input:invalid)`: This selector matches any `<form>` element that contains an invalid (i.e., not conforming to the validation rules) `<input>` element. If a match is found, the background color of that `<form>` element is set to red.
2. `form:not(:has(input:invalid))`: This selector matches any `<form>` element that does not contain any invalid `<input>` elements, i.e., all `<input>` elements are valid and conform to the validation rules. If a match is found, the background color of that `<form>` element is set to green.

## <a name="caution">4. Points to Note</a>

This code uses the `:has()` pseudo-class, so it will only work in browsers that support this selector. Furthermore, the validation rules are defined by the attributes of the `<input>` elements (such as `required`, `pattern`, etc.).

## <a name="conclusion">5. Conclusion</a>

By utilizing the CSS `:has()` pseudo-class, you can provide visual feedback when a user inputs invalid data into a form, thereby contributing to an enhanced user experience. However, it's crucial to check the browser compatibility of the `:has()` pseudo-class and set up appropriate validation rules.
Introducing Encryption at Rest: Protecting Your Emails Even When They Sleep
Tags: encryption, openpgp, smime, email
Published: 2023-08-04 08:42:36

In the digital age where privacy and data protection are paramount, we continually strive to enhance the security features offered by Stalwart Mail Server. Today, we're thrilled to announce our latest upgrade – **Encryption at Rest**!

### Understanding Encryption at Rest

Encryption at Rest is designed to protect your data when it's stored, or 'at rest,' on your server. This new feature introduces the ability to automatically encrypt plain-text email messages with **OpenPGP** (Pretty Good Privacy) or **S/MIME** (Secure/Multipurpose Internet Mail Extensions) before being written to disk. It provides the option to use either AES256 or AES128 encryption for PGP and AES256-CBC or AES128-CBC for S/MIME.

### Why It Matters

With Encryption at Rest, your data remains secure even in the event of a physical storage breach. The encrypted data stored on your mail server is inaccessible without the unique decryption keys. Even system administrators don't have the capacity to decrypt these messages, reinforcing the privacy of your communications. 

### How it Works

Encryption at rest in Stalwart Mail Server is easy to enable and use. All it requires is for users to upload their S/MIME certificate or PGP public key using a user-friendly web interface. These keys are utilized to automatically encrypt plain-text messages before they are written to disk.

### Comparative Look

What sets Stalwart Mail Server's implementation apart is its unique approach to key management. Unlike some other mail servers, Stalwart Mail Server does not store the private key on the server or in the database. This means that even the system administrators or anyone with access to the database won't be able to decrypt your messages.

Take for instance, Dovecot's mail-crypt plugin. While it's a powerful tool for ensuring the security of email storage, its design requires the private key to be stored in the database. This effectively means that your emails can still be decrypted by someone with the right access. In contrast, Stalwart Mail Server provides an extra layer of security by allowing the user to retain sole possession of their private keys.

### Looking Ahead

At Stalwart Labs, we're committed to your data protection and privacy. Encryption at Rest is a significant addition to our email security arsenal, and we're excited for you to start using it. For detailed information on Encryption at Rest and instructions on its use, please visit our updated [documentation](https://stalw.art/docs/storage/encryption/overview) and [FAQ](https://stalw.art/docs/faq#encryption).

Stay tuned for more updates, and happy mailing!
Neumorphism-Website (Part 6)
Tags: devdiscuss, webdev, api, programming
Published: 2023-08-04 08:39:41

**Yes, exactly!**
You guessed right:
It's that time again for an update on our great Github API website project.

---

If you like it, I would really appreciate a comment and a like 💌!

---
## What's new?
Today there are again improvements to the project page:
Information about the repository is now always displayed in the left sidebar.

First of all, the description counts.

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/1cdlnew8c4nqcmlukgsh.png)

The topics are then listed.

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/0q6ks8n5tv71etqdja2m.png)

And finally some numbers:
The number of stars, forks and observers.

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/niz4dglnfwu93vldsvs7.png)

Of course, everything is linked to Github, so you can look at all the information on Github super quickly. The topics also automatically link to the Github topics.

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/ytn8e6q1ss6v3ygr8ma8.png)


## What's next?

I already have an idea and I'm actually starting to realize it. There is a new settings.html page where you can change the background color of all pages on the Neumorphism website.
Here are also some screenshots.

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/pqaawzz0c8mefnwn8lcq.png)


Thanks,
schBenedikt
![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/t2ea2qhtrxfa7vsuqcok.png)



In any case, it's always worth checking Github and dev.to!