https://github.com/amwebexpert/dynamodb

DynamoDB local POC
https://github.com/amwebexpert/dynamodb

Last synced: 10 months ago
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DynamoDB local POC

• Host: GitHub
• URL: https://github.com/amwebexpert/dynamodb
• Owner: amwebexpert
• Created: 2021-01-04T21:00:17.000Z (over 5 years ago)
• Default Branch: master
• Last Pushed: 2021-01-08T00:32:42.000Z (over 5 years ago)
• Last Synced: 2025-04-23T10:55:18.844Z (about 1 year ago)
• Language: JavaScript
• Size: 55.7 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
# DynamoDB POC

## Setup

### Step 1

    npm install

### Step 2 Starting local instance of DynamoDB

    npm run dynamodb:start

then test it from command line like this:

    aws dynamodb list-tables --endpoint-url http://localhost:8000

or open the shell UI:

    http://localhost:8000/shell/

Examples Web shell commands:

- type 'list' + control-space this can show/insert code snipets like:

### Step 3 Starting dynamodb-admin GUI

Two good Admin consoles have been tested in this POC:

- https://github.com/YoyaTeam/dynamodb-manager

- https://github.com/aaronshaf/dynamodb-admin

    ./startDynamoDBManager.sh

then open browser at http://localhost:8002/

### Play with scripts

    node src/deleteTable.js

    node src/createTable.js

    node src/loadData.js

    node src/queries-account.js

    node src/queries-team.js

    node src/queries-user.js

## DynamoDB SDK usage of DocumentClient

    https://docs.aws.amazon.com/sdk-for-javascript/v2/developer-guide/dynamodb-example-document-client.html

    https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Query.html#Query.KeyConditionExpressions

    https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Expressions.OperatorsAndFunctions.html

## Design considerations

    - UUID vs other id

    - https://stackoverflow.com/a/44297379/704681 (for case insensitive queries, like nameSearch at insert time or Elastic Search)

    - Cost considerations:

        - fetching users/accounts by using filtering like `contains` which causes table scanning

        - indexes with `ALL` instead of KEYS_ONLY, INCLUDE

    - Version for "optimism looking" @DynamoDBVersionAttribute annotation

    - Cashing using Spring cache annotations