DMS - PostgreSQL to DynamoDB Replication Problem

Question

Hello,

We have a DMS that replicates data from PostgreSQL (Engine version 12.14 and full-load-and-cdc) to DynamoDB. We are not having a problem with replicating the new data or present data, our problem is data deleted on RDS is not replicated to DynamoDB.

In short, data deleted in RDS remains in DynamoDB

Thanks in advance

Answer

Hi,

Please confirm if the table being migrated has a primary key in the source database. Currently, AWS DMS has the below limitation[1]:
- A captured table must have a primary key. If a table doesn't have a primary key, AWS DMS ignores DELETE and UPDATE record operations for that table. As a workaround, see Enabling change data capture (CDC) using logical replication.

Please confirm that the role that you use for the migration to DynamoDB has the following permission [2]:
`        "dynamodb:DeleteItem",`

Are there any errors or warnings noted in the AWS DMS task logs. In the Cloudwatch logs, search for "]E:" for errors and "]W:" for warnings.

**References:**

[1] Using a PostgreSQL database as an AWS DMS source - Limitations on using a PostgreSQL database as a DMS source - https://docs.aws.amazon.com/dms/latest/userguide/CHAP_Source.PostgreSQL.html#CHAP_Source.PostgreSQL.Limitations
[2] Using an Amazon DynamoDB database as a target for AWS Database Migration Service - Prerequisites for using DynamoDB as a target for AWS Database Migration Service - https://docs.aws.amazon.com/dms/latest/userguide/CHAP_Target.DynamoDB.html#CHAP_Target.DynamoDB.Prerequisites

DMS - PostgreSQL to DynamoDB Replication Problem

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