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Database / Amazon DynamoDB Interview questions

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What is DynamoDB?

DynamoDB is a fully managed NoSQL database service. It is backed by AWS and provides exciting features like seamless scalability, fast performance, and high reliability over data. DynamoDB supports both key-value and document data structures.

DynamoDB is quite effective at data storing and retrieval in all traffic levels and allows the users to create tables for the database.

List the key features of DynamoDB.
  • Highly Scalable without any intervention from the user.
  • It has a latency of microseconds.
  • Serverless and enterprise-ready.
  • Encryption at Rest.
  • On-demand backup and restore.
  • Point-in-time recovery.
Advantages of using DynamoDB.
  • Store any amount of data with the unlimited storage provided by the DynamoDB service.
  • High-availability, the data we store replicates over many availability regions.
  • Highly cost-effective, and pay only for what you use and the user do not worry about software patching, setup, and configuration because AWS fully manages DynamoDB.
  • DynamoDB has an advanced system for reporting and highly secured user authentication mechanisms to provide maximum security over sensitive data.
Disadvantages of DynamoDB.
  • No DB triggers and lack server-side scripts.
  • No table joins.
  • Limited Data querying capability.
  • The cost may become a overhead due to spike in usage.
What are the APIs provided by Amazon DynamoDB?

  • UpdateTable
  • CreateTable
  • DescribeTable
  • DeleteTable
  • PutItem
  • ListTables
  • UpdateItem
  • BatchWriteItem
  • GetItem
  • Query
  • DeleteItem
  • Scan
  • BatchGetItem.

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