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Whats the proper way to implement a unique secondary index on a DynamoDB table that has no range key?


Whats the proper way to implement a unique secondary index on a DynamoDB table that has no range key?

By : user2951773
Date : November 18 2020, 03:49 PM
wish of those help I personally don't like to use indexes.
What I recommend is to keep two tables.
code :


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DynamoDB: range vs. global secondary index

DynamoDB: range vs. global secondary index


By : Somjoog Maito
Date : March 29 2020, 07:55 AM
I hope this helps you .
Define a hash+range primary key using id as the hash and timestamp as the range.
code :
id (Hash) | timestamp (Range)
----------|-------------------------
john      | 2014-04-28T07:53:29.000Z
john      | 2014-04-28T08:53:29.000Z
john      | 2014-04-28T09:53:29.000Z
mary      | 2014-04-28T07:53:29.000Z
jane      | 2014-04-28T07:53:29.000Z
id (Hash) | timestamp (GSI Hash Key)
----------|-------------------------
john      | 2014-04-28T07:53:29.000Z
mary      | 2014-04-28T07:53:29.000Z
jane      | 2014-04-28T07:53:29.000Z
How do I implement a DynamoDB Global Secondary Index with Infrastructure As Code in CloudFormation

How do I implement a DynamoDB Global Secondary Index with Infrastructure As Code in CloudFormation


By : fengyanyan
Date : March 29 2020, 07:55 AM
seems to work fine You need to add table-name at AttributeDefinitions property. From docs:
code :
Resources:
  CaseRecords:
    Type: AWS::DynamoDB::Table
    Properties:
      TableName: ${self:custom.tableName}
      BillingMode: PAY_PER_REQUEST
      AttributeDefinitions:
        - AttributeName: userId
          AttributeType: S
        - AttributeName: caseRecordId
          AttributeType: S
        - AttributeName: table-name
          AttributeType: S
      KeySchema:
        - AttributeName: userId
          KeyType: HASH
        - AttributeName: caseRecordId
          KeyType: RANGE
      # Set the capacity based on the stage
      # ProvisionedThroughput:
      # ReadCapacityUnits: ${self:custom.tableThroughput}
      # WriteCapacityUnits: ${self:custom.tableThroughput}
      # Implement a GSI to handle item count totals
      GlobalSecondaryIndexes:
        - IndexName: gsiCaseCountTable
          KeySchema:
            - AttributeName: table-name
              KeyType: HASH
          Projection:
            NonKeyAttributes:
              - count
            ProjectionType: INCLUDE
Which column should I pick up as secondary index in this dynamodb table?

Which column should I pick up as secondary index in this dynamodb table?


By : user3499419
Date : March 29 2020, 07:55 AM
I hope this helps you . You can create a Global Secondary Index where the partition key will be CustomerID and sort key will be PurchaseDate. By this, you can perform query operations on a particular customer by CustomerID within a date range of PurchaseDate. You can try out the query code below in AWS lambda IDE :)
code :
import json
import boto3
from boto3.dynamodb.conditions import Key

def lambda_handler(event, context):
    dynamodb = boto3.resource("dynamodb")
    table_name = "your_table_name"
    table = dynamodb.Table(table_name)
    customer_id = 1
    start_date = "2019-12-10"
    end_date = "2019-12-16"

    response = table.query(
        KeyConditionExpression=Key('CustomerID').eq(customer_id) & 
            Key('PurchaseDate').between(start_date, end_date)                                                            
    )
    return response
Maximum value of global secondary index range key in dynamoDB

Maximum value of global secondary index range key in dynamoDB


By : roshan raj
Date : March 29 2020, 07:55 AM
it fixes the issue I would go and use a different approach.
From your requests I am assuming financialID should be unique. The database won't prevent you from duplicating it and you should make sure some other part of your application syncs these numbers. So you need an atomic counter.
Dynamodb with unique secondary/third index

Dynamodb with unique secondary/third index


By : ivan korostelev
Date : March 29 2020, 07:55 AM
To fix the issue you can do You are correct that DynamoDB does not enforce uniqueness on Global Secondary Indexes.
If you are going to use a single DynamoDB table, the only thing that is enforced to be unique is the primary key (hash + optional range key). This is because an item is uniquely identified by that key. So to combine your tables into a single table will require that enforcement in the application logic.
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