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Step-by-Step Guide to Creating an AWS RDS Database Instance

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 Amazon Relational Database Service (AWS RDS) makes it easy to set up, operate, and scale a relational database in the cloud. Instead of managing servers, patching OS, and handling backups manually, AWS RDS takes care of the heavy lifting so you can focus on building applications and data pipelines. In this blog, we’ll walk through how to create an AWS RDS instance , key configuration choices, and best practices you should follow in real-world projects. What is AWS RDS? AWS RDS is a managed database service that supports popular relational engines such as: Amazon Aurora (MySQL / PostgreSQL compatible) MySQL PostgreSQL MariaDB Oracle SQL Server With RDS, AWS manages: Database provisioning Automated backups Software patching High availability (Multi-AZ) Monitoring and scaling Prerequisites Before creating an RDS instance, make sure you have: An active AWS account Proper IAM permissions (RDS, EC2, VPC) A basic understanding of: ...
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10 Blockchain Smart Contract Interview Questions

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10 Blockchain Smart Contract Interview Questions

Here are the top ten interview questions on Blockchain smart contracts. Here you will know about smart-contract, what language and IDE you need to develop. Useful for interviews as well.

1. What is a Smart Contract?


A smart contract is an executable code on the blockchain intended to digitally facilitate, verify, validate, and enforce the rules and regulations of an application. Smart contracts allow the performance of credible transactions without third parties. These transactions are trackable and irreversible.


2. Where the smart Contract code resides?


The smart contract is deployed in a sandbox environment and identified by a 160-bit account address like any other participants on the blockchain network. It executes on the virtual machine (VM) on the blockchain node and is identified by an account number.


3. Smart Contract is it API?


Yes, it is like a class. It has methods. These are useful to process transactions in the Blockchain framework.


4. What are the six functions of Smart-contract?


  • It represents a business logic layer for the verification and validation of application-specific conditions.
  • It allows for the specification of rules for operations on the blockchain.
  • It facilitates the implementation of policies for the transfer of assets in a decentralized network.
  • It embeds functions that can be invoked by messages or function calls from participant accounts or other smart contract accounts. These messages and their input parameters, along with additional metadata such as the sender's address and timestamp, result in transactions recorded in the distributed ledger of the blockchain.
  • It acts as the software-based intermediator for decentralized blockchain-based applications.
  • It adds programmability and intelligence to the blockchain through the specification of the parameters of its functions.

5. What are the three key elements of a Smart Contract?

  1. Data
  2. Functions that operate on the data
  3. Rules for operations

6. How does it looks like a Smart Contract?


  • Name of the class
  • Data definitions
  • Function definitions

7. What is the name of the Programming language you use?


Solidity is an object-oriented, high-level language for implementing smart contracts, influenced by C++, Python, and JavaScript. Solidity is statically typed and supports inheritance, libraries, and user-defined types; it also provides many useful features for developing blockchain applications.


8. What is the name of IDE?


Open the Remix web IDE in your browser.


9. Who can access the Smart contract code?


When a smart contract code is deployed on a blockchain, it is accessible to anybody who has a defined identity on that blockchain.


10. Best example of a Blockchain smart contract?

Airline System.

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