DynamoDB

DynamoDB

A fully managed, highly scalable NoSQL key-value database that can maintain millisecond latencies at any scale

• Just like RDS Aurora, it’s a database engine built by Amazon
• Important
  • You don’t create tables with the query language that you use to talk to the db
  • No need to connect to the db to then create tables inside of it
  • You NEVER create a db, you JUST create tables!
  • Can create many tables as you need, but you don’t group/structure the, into dbs
  • No need to worry about db configurations, AWS takes care for you
• A regional service
• ex) A user wants a NoSQL database that can scale to millions of requests per second with single-digit millisecond latency

You create tables

You don’t create instances or clusters unlike RDS or ElastiCache, just start right at the table lvl

• You have to give the table a name
• Partition key
  • Main identification key
  • specify a primary key that uniquely identifies each item in the table
  • should be unique for each item in the table, like an ID
• Choose payment
  • Non on demand plan
    • Choose expected read/write capacities to define how much you’re gonna pay for
  • On demand
    • you only pay for the occurring read/writes, more expensive but more flexibility
• Choose encryption settings on a table basis
• Once a table is created/configured
• start managing data
• write/read data with the SDK
  • no general query language, but u need to use AWS tools to interact
• configure backups for the data

Advanced Features

• diagram
• Streams
  • DynamoDB Streams is essentially a log of changes (additions, updates, and deletions) made to items in a DynamoDB table
  • not enabled by default
  • allows you to capture changes to items in your DynamoDB table and make these changes available for other systems to process or take action upon
  • useful when you need to react to data changes (like additions, updates, or deletions) in real-time without polling the database constantly
    • kinda reminds me of React!
  • After enabling Streams, other systems or applications can subscribe to the stream and be notified whenever there is a change.
• Global tables
  • A Global Table is a special type of DynamoDB table that spans multiple AWS regions. It automatically replicates the data between these regions.
  • You can convert a table from one region into a global table
  • makes it available with low-latency access for users anywhere in the world
  • Not free (and can get quite expensive)
  • Click table > create replica
• DAX
  • Database Acceleration feature
  • A managed in-memory cache layer, fully managed by AWS
  • does come at a price