Can I copy one RDS to another RDS, of which it is a subset?

 

Assume RDS A has the following tables: table1, table2, table3;

And RDS B has the above tables and then more: table1, table2, table3, table4, table5.

Can I do a one-way copy from RDS A to RDS B?

That is, the data in the three tables (table1, table2, table3) in RDS A is copied to the corresponding three tables (table1, table2, table3) in RDS B simultaneously.

Moreover, can I modify the other two table ie table4 and table5 of RDS B, afterwards?

If this is possible, what will be the proper steps to achieve that?

Yes! You can do it using Aws Database Migration Service. Please take a look at https://aws.amazon.com/dms/

You can use AWS console to create and map the source and destination or install the schema something from amazon to do it.

There are multiple ways to achieve this. Each approach has its tradeoffs interms of staleness of data, efficiency, cost & etc.

  • Using AWS Glue you can do timely data migrations in the form so of ETL. Few advantages of this approach is that you can select idividual tables for migration as well as do any transformation before data puts in to RDS B. If you are familiar with Python this will be a great choice since its serverless and less moving parts to manage.
  • Using AWS Data Migration Service. Suits both for timely migrations as well as continuous migrations.
  • Using AWS Data Pipeline. More suitable for very large databases and if you also have plans to do any computational heavy transformatins. For small databases this can be a overkill.
  • For timely migrations, you can create a Snapshot of RDS A and Restore it to RDS B or promote a Read Replica to RDS B.

    • More details in comparing AWS Glue and other Services refer the AWS FAQ.

    Note: All of these approaches are one way trasfer so you can edit the tables on the RDS B.

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