teleren/devto huggingface dataset:
The Unthinkable Hacks: Cybersecurity Secrets That Will Leave You Awestruck
Published: 2023-04-16 08:11:27

Welcome to the digital jungle, where cybersecurity threats lurk behind every byte! In today's world, as we become increasingly connected, protecting our virtual selves and assets is more critical than ever. While most people are aware of the common cybersecurity threats, there are some lesser-known hacks that will leave you absolutely awestruck. In this blog post, we'll dive into the fascinating world of cybersecurity and unveil some mind-blowing techniques used by hackers to infiltrate the most secure systems. Buckle up for a wild ride!

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/da43iapmc8p6f773o83x.jpg)
**Section 1: The Unheard-of Hacks**

_1.1 The Great HVAC Heist_
In 2013, hackers managed to breach the security of a major retailer by infiltrating the company's heating, ventilation, and air conditioning (HVAC) system. Unbeknownst to many, these systems are often connected to the internet, making them vulnerable to attack. Once inside, the hackers accessed the retailer's point-of-sale systems and stole credit card information from millions of customers.

_1.2 The Printer Ploy_
With the rise of smart devices, even your office printer could be a potential point of entry for hackers. By exploiting vulnerabilities in printer firmware, they can gain access to sensitive information or even use the printer as a stepping stone to infiltrate other parts of the network.

**Section 2: Social Engineering - Hacking the Human**

_2.1 The Inside Job_
In some cases, the weakest link in a company's cybersecurity defenses isn't a piece of technology – it's the people who work there. By using social engineering tactics, hackers can manipulate employees into divulging sensitive information or granting unauthorized access.

_2.2 Phishing for Dollars_
Phishing attacks involve sending deceptive emails or messages that appear to come from legitimate sources. These messages often prompt users to click on a malicious link or download a harmful attachment, compromising their systems and exposing sensitive data.

**Section 3: The Future of Cybersecurity**

_3.1 Machine Learning vs. Hackers_
As technology advances, so too do the techniques used by hackers. Machine learning and artificial intelligence (AI) are being used to identify and respond to potential threats more rapidly and accurately than ever before. This, in turn, is forcing hackers to adapt and innovate.

_3.2 The Quantum Leap_
Quantum computing is poised to revolutionize cybersecurity. As these powerful machines become more accessible, they hold the potential to crack even the most advanced encryption methods. Cybersecurity experts are already working on quantum-resistant algorithms to stay one step ahead of the game.


The world of cybersecurity is an ever-evolving landscape, and the techniques used by hackers can be both awe-inspiring and terrifying. By staying informed and adopting best practices, we can better protect ourselves and our digital assets. Remember, in the digital jungle, it's survival of the fittest – stay vigilant and stay safe!
Optimizing Your Database Operations: Essential Techniques for Query Performance with Schema Design
Published: 2023-04-21 20:27:04

---
title: Optimizing Your Database Operations: Essential Techniques for Query Performance with Schema Design
published: true
date: 2023-04-16 08:10:33 UTC
tags: 
canonical_url: https://harshmange.hashnode.dev/optimizing-your-database-operations-essential-techniques-for-query-performance-with-schema-design
---

1. 
## Normalization

Normalization is a process of organizing the database schema to eliminate redundant data and minimize the data dependency. Normalization can help to reduce the amount of data that needs to be read and minimize the number of joins required to answer a query. For example, if you have a table that contains information about customers and their orders, you can normalize the schema by creating separate tables for customers and orders. This way, you can avoid duplicating customer information for every order and simplify the queries that join these two tables.

2. 
## Denormalization

Denormalization is the opposite of normalization. It involves introducing redundant data into the schema to improve query performance. This can be particularly useful for read-heavy applications, where the cost of reading data from multiple tables outweighs the cost of storing redundant data. For example, you could denormalize a customer and order schema by adding a column for the customer name to the order table. This would eliminate the need to join the customer and order tables to retrieve the customer name for each order.

3. 
## Clustering

Clustering is a technique for physically organizing data on disk to improve query performance. Clustering involves storing data that is frequently accessed together on the same disk pages. This way, the database engine can read all of the necessary data for a query in a single disk read operation. For example, if you have a table of sales data and frequently query by customer ID, you could cluster the table on the customer ID column so that all of the sales data for a given customer is stored together on disk.
Top FREE HTML Resources
Tags: html, webdev, beginners, tutorial
Published: 2023-04-16 08:02:23

If you want to become a full stack web developer, then your first step should be learning HTML, and if you go on the internet and search for resources of HTML, you will be lost in the ocean of resources. So in this particular blog, I will be sharing some top resources from where you can learn HTML for free and move ahead with your journey of becoming a full-stack web developer.


Before going to resources, let’s understand what is HTML?

HTML is the hypertext markup language that decides how your web page will look like.
HTML defines the structure of the web page and it is used for creating different web pages.
HTML particularly discusses the structure of any web page.
next up let’s talk about some important Concepts that you should be focusing on while learning HTML starting with the

Different types of semantic tags: So on any web page there are different types of tags so you should be aware of different semantic tags which define the structure of a web page.
HTML forms: On the webpage, there is one important part of taking input from the user and working accordingly so you should be aware of HTML forms.
HTML tables: you should be aware of HTML tables so that you can create different tables of different sizes.
HTML media: In HTML media you should be aware of three tags which are image video and audio tags.
So up until this point in time, we have talked about what is HTML and what are the different important topics that you should be focusing on while learning HTML.

Let’s talk about the resources. So in this particular blog, I will be sharing two types of resources. The first one is documentation. Documentation will help you to learn any technology, as well as it will serve you as a reference if you need help in the future. The next type of resource is video tutorials.

Starting with the resources

1. w3schools

![Image1](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/vmbrkhfilpuhhqz6pqda.png)

2.MDN Docs

![Image2](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/twmi7zdxnazqdc8q07d4.png)

3.html.com

![Image3](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/r37fezd5x1lq09maa0k5.png)

4.Tutorial by freecodecamp

![Image4](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/e0lzoyrsqkgh0r93l0yi.png)

5.Crash course by traverse media

![Image5](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/4enieuyttpxo20aldpgs.png)

6.Crash course by Programming with Mosh

![Image6](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/7geqjj68hrdpnfpsbk67.png)

7.Tutorial by CodeWithHarry

![Image7](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/okxmiyun0v41y5vdhrs1.png)


[Resources Link (Notion Page) 🧑🏼‍💻](https://wobbly-jade 693.notion.site/HTML-83767e7c2a34486abac51510f94c3ffc)

You can watch this particular video from my channel for a better understanding:

[Video Link](https://youtu.be/zmx4u6xJamM)

Get in Touch with me: https://linktr.ee/Devgrammer

Follow @sanket00900 for more !!!
💫 The Solution to node_modules 💾
Tags: webdev, node, javascript, programming
Published: 2023-04-16 07:51:13

You've most likely seen this **meme** and as funny as it is, there is some **truth**... 👀

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/axd202tm8zlwi75wsw67.png)

This is the NodeJS Experience. (This is on a good day)

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/jdjjn9b1oku6rxfoted3.png)

## Well, Wait [Nodemore](https://github.com/WillKirkmanM/nodemore)!

An easy-to-use tool that is able to solve your problems. It recursively checks your folders for any unused NodeJS projects accessed in any time frame you desire and then removes only the node_modules taking up your precious space. (And it's in Rust 🦀)

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/q7em2gqj3eh6r6nrn24j.png)

Here it is, Feel Free to Star the Repository
⭐ https://github.com/WillKirkmanM/nodemore/
Getting the Most Out of Your Queries: Best Practices for Partitioning Database Queries
Published: 2023-04-21 20:26:20

---
title: Getting the Most Out of Your Queries: Best Practices for Partitioning Database Queries
published: true
date: 2023-04-16 07:50:52 UTC
tags: 
canonical_url: https://harshmange.hashnode.dev/getting-the-most-out-of-your-queries-best-practices-for-partitioning-database-queries
---

Database query optimization through partitioning involves dividing large database tables into smaller, more manageable pieces, which can help improve query performance. The partitioning technique involves dividing a table into smaller, more manageable parts called partitions, which can be spread across multiple physical storage devices. This approach can help to reduce the amount of data that needs to be scanned by a query, making the query faster and more efficient.

Here are some examples of partitioning techniques that can be used to optimize database queries:

1. 
## Range partitioning

This technique involves dividing a table into partitions based on a range of values in a specific column. For example, a sales table could be partitioned based on date ranges such as months or quarters. This can help optimize queries that are based on date ranges by allowing the database to scan only the relevant partitions.

2. 
## Hash partitioning

This technique involves dividing a table into partitions based on a hash function that is applied to a specific column. For example, a customer table could be partitioned based on the first letter of the customer's last name. This can help optimize queries that are based on specific values by allowing the database to scan only the relevant partitions.

3. 
## List partitioning

This technique involves dividing a table into partitions based on a specific set of values in a specific column. For example, a product table could be partitioned based on product types such as electronics or clothing. This can help optimize queries that are based on specific values by allowing the database to scan only the relevant partitions.

4. 
## Composite partitioning

This technique involves using a combination of the above partitioning techniques to partition a table. For example, a sales table could be partitioned first by date range and then by product type. This can help optimize queries that are based on specific values and date ranges by allowing the database to scan only the relevant partitions.
Caching Database Queries 101: Techniques Every Developer Should Know
Published: 2023-04-21 20:26:10

---
title: Caching Database Queries 101: Techniques Every Developer Should Know
published: true
date: 2023-04-16 07:42:59 UTC
tags: 
canonical_url: https://harshmange.hashnode.dev/caching-database-queries-101-techniques-every-developer-should-know
---

1. Use a query cache plugin: Many database systems provide query cache plugins that can be used to cache the results of frequently executed queries. These plugins typically allow you to configure the size of the cache and specify which queries should be cached. For example, in MySQL, you can use the query cache plugin to cache the results of SELECT queries.

2. Cache query results in your application: If your application frequently executes the same queries, you can cache the results in memory or on disk to avoid executing the query again. This can be especially useful for queries that are executed across multiple requests. For example, if your application frequently retrieves a list of products from a database, you can cache the results in memory and reuse them across requests.

3. Use prepared statements: Prepared statements are a feature of many database systems that allow you to pre-compile a query and reuse it with different parameters. Prepared statements can be cached by the database system, which can improve performance by reducing the overhead of parsing and optimizing the query. For example, in MySQL, you can use prepared statements to execute a query multiple times with different parameters.

4. Use indexes: Indexes are an important tool for optimizing query performance. By creating indexes on the columns that are frequently used in queries, you can reduce the amount of time it takes for the database system to retrieve the data. This can improve the overall performance of your queries and reduce the need for query caching.
Best Websites for Developers
Tags: react, webapp, javascript
Published: 2023-04-16 07:39:47

Here are some of the most beneficial websites I've found to make my life simpler. Make a note of this post and let's get started.


<br></br>

[1. Beautiful Snippet Code ](https://codeimg.io/)

<br></br>
![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/ar96a4ggjjrw42ydsv8o.png)
<br>

You may now digitally share attractive Snippet code graphics of any programming language with your pals. You may also change the colors, typeface, and other aspects of the sample picture.

<br>

[2. Cheat sheet](https://cheatography.com/)

<br>


![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/j6w5he6d716e5m9ieeng.png)

<br>

Cheatography is a collection of cheatsheets for several programming languages. It also includes a cheat sheet for practically all language modules and libraries. Not only does it provide programming cheatsheets, but it also contains gaming, home, software education, and many more amazing cheatsheets. Give this website a go!

[3. Colors ](https://colors.muz.li/)


![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/80ew3d553nhis54jyzzu.png)

If you're looking for attractive color palettes for your web development project, this website has options for you. You may also search for colors, receive palettes, and look at some inspiration works.

[4. Resume maker](https://zety.com/)


![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/f72o0equp9aa7g393bes.png)

If you need a resume to apply for your dream job, this website will supply you with a free professional resume creator that allows you to select from a variety of resume and CV designs. [Try this site now!](https://zety.com/)


[5. Canva](https://www.canva.com/)


![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/rhywwqok2lj10emq9f2k.png)

Canva is one of my favorite websites for creating designs. In it, I usually design Pinterest cover graphics. As a developer, you'll find this useful; it has a plethora of features, as illustrated in the image example.
As a ReactJS developer, here are some advice to consider:
Tags: react, frontend
Published: 2023-04-16 07:10:31

- Keep up to date with the latest trends and updates in the React ecosystem. Attend meetups, conferences, and read the latest blogs and articles.

- Focus on creating reusable components that can be used across different projects. This will save you time and make you more efficient as a developer.

- Understand the principles of Redux and the importance of state management. Redux helps to manage the state of your application, making it easier to debug and maintain.

- Learn to write clean and readable code. This will make it easier for other developers to understand and maintain your code.

- Practice good debugging techniques. Use tools like React Developer Tools and Chrome DevTools to debug your code.

- Use best practices in your development process, such as code reviews, automated testing, and continuous integration and delivery.

- Don't be afraid to ask for help or advice from other developers. Join online communities like Stack Overflow, Reddit, and GitHub to learn from others and share your knowledge.

- Keep an eye on performance. Optimize your code for better performance, as slow performance can be a major issue for React applications.

- Finally, be patient and persistent in your learning journey. React is a complex and constantly evolving technology, and it takes time to become a proficient developer.
The Weekend Coder: If You Were a Programming Language, What Type of Personality Would You Have?
Tags: discuss, beginners, codenewbie, watercoolor
Published: 2023-04-16 07:00:00

Are you simple or complex? Creative or analytical? Would you be dynamic and expressive like Python, or more structured and disciplined like Java?

Share with us in the comments which programming language you think matches your personality and tell us why. 

---

Follow the [CodeNewbie Org](https://dev.to/codenewbieteam) and [#codenewbie](https://dev.to/t/codenewbie) for more engaging, thought-provoking, and sometimes silly discussions just like this.
Sparse Arrays hackerrank solution in java
Tags: java, hackerrank, dsa, algorithms
Published: 2023-04-16 06:56:35

```
import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.function.*;
import java.util.regex.*;
import java.util.stream.*;
import static java.util.stream.Collectors.joining;
import static java.util.stream.Collectors.toList;

class Result {

    /*
     * Complete the 'matchingStrings' function below.
     *
     * The function is expected to return an INTEGER_ARRAY.
     * The function accepts following parameters:
     *  1. STRING_ARRAY stringList
     *  2. STRING_ARRAY queries
     */

    public static List<Integer> matchingStrings(List<String> stringList, List<String> queries) {
        HashMap<String,Integer> hm = new HashMap<>();
        for(int i=0;i<stringList.size();i++){
            String s = stringList.get(i); 
            hm.put(s,hm.getOrDefault(s,0)+1);
        }
        List<Integer> res = new ArrayList<>();
        for(int i=0;i<queries.size();i++){
            String s = queries.get(i);
            if(hm.containsKey(s)){
                res.add(hm.get(s));
            }else{
                res.add(0);
            } 
        }
        return res;
    }

}

public class Solution {
    public static void main(String[] args) throws IOException {
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));

        int stringListCount = Integer.parseInt(bufferedReader.readLine().trim());

        List<String> stringList = IntStream.range(0, stringListCount).mapToObj(i -> {
            try {
                return bufferedReader.readLine();
            } catch (IOException ex) {
                throw new RuntimeException(ex);
            }
        })
            .collect(toList());

        int queriesCount = Integer.parseInt(bufferedReader.readLine().trim());

        List<String> queries = IntStream.range(0, queriesCount).mapToObj(i -> {
            try {
                return bufferedReader.readLine();
            } catch (IOException ex) {
                throw new RuntimeException(ex);
            }
        })
            .collect(toList());

        List<Integer> res = Result.matchingStrings(stringList, queries);

        bufferedWriter.write(
            res.stream()
                .map(Object::toString)
                .collect(joining("\n"))
            + "\n"
        );

        bufferedReader.close();
        bufferedWriter.close();
    }
}

```
Upload, Download and List files from AWS S3 using Python
Tags: python
Published: 2023-04-16 06:50:56

How to Upload, Download and List files from AWS S3 using Python?


**Prerequisite:**


1. 1.Create an account in AWS to access s3 .
2. 2.Create an bucket is S3 to upload and download and list object using Python.
3. 3.Upload a file to it so that we can use to download using python.
4. 4.to list all the object in s3 for mentioned bucket.



**Python Snippet :**


- List all the buckets in aws s3.

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/sohim5t24t0w59exge4d.png)


- Download object from bucket from s3.


![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/hthn3r2z692rv53awa8u.png)



- Upload object into sample bucket using s3.


![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/9ev2fejwi04246qqpph1.png)



 - List object from sample bucket in S3.


![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/7nylun3t5n98ub7ujjm6.png)





Thank you for reading , Well hope you all understood the boto3 few API in AWS.
Left Rotation hackerrank Solution in java
Tags: java, hackerrank, algorithms, dsa
Published: 2023-04-16 06:44:02

```
import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.function.*;
import java.util.regex.*;
import java.util.stream.*;
import static java.util.stream.Collectors.joining;
import static java.util.stream.Collectors.toList;

class Result {


    public static List<Integer> rotateLeft(int d, List<Integer> arr) {
        List<Integer> res = new ArrayList<>();
        for(int i=d;i<arr.size();i++){
            res.add(arr.get(i));
        }
        for(int i=0;i<d;i++){
            res.add(arr.get(i));
        }
        return res;
    }

}

public class Solution {
    public static void main(String[] args) throws IOException {
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));

        String[] firstMultipleInput = bufferedReader.readLine().replaceAll("\\s+$", "").split(" ");

        int n = Integer.parseInt(firstMultipleInput[0]);

        int d = Integer.parseInt(firstMultipleInput[1]);

        List<Integer> arr = Stream.of(bufferedReader.readLine().replaceAll("\\s+$", "").split(" "))
            .map(Integer::parseInt)
            .collect(toList());

        List<Integer> result = Result.rotateLeft(d, arr);

        bufferedWriter.write(
            result.stream()
                .map(Object::toString)
                .collect(joining(" "))
            + "\n"
        );

        bufferedReader.close();
        bufferedWriter.close();
    }
}

```