6. How can you move data from on-premises to Amazon S3?

LSI Keywords: On-premises data migration to Amazon S3

Migrating data to Amazon S3 can be achieved in multiple ways:

• AWS Snowball: A physical device used to transfer large amounts of data securely.
• AWS DataSync: Transfers data over the internet or AWS Direct Connect.
• AWS Transfer Family: A fully managed service for transferring files over FTP, FTPS, and SFTP.
• AWS Storage Gateway: Integrates on-premises environments with cloud storage.

7. Explain how AWS Glue ETL jobs work.

LSI Keywords: AWS Glue ETL, data transformation

AWS Glue is a fully managed extract, transform, and load (ETL) service. The process involves:

• Data Crawling: Glue scans the data sources to determine the schema.
• Data Catalog: Metadata is stored in the AWS Glue Data Catalog.
• ETL Code Generation: Glue generates ETL code in Python or Scala.
• Data Transformation: The data is transformed according to the ETL logic.
• Data Loading: The transformed data is loaded into the destination data store.

8. How can you ensure data consistency in distributed systems on AWS?

LSI Keywords: Data consistency in distributed systems, CAP theorem

In distributed systems, the CAP theorem states that you can have only two of the following three guarantees: Consistency, Availability, and Partition tolerance. To ensure data consistency, you may use techniques like strong consistency models, distributed transactions, and data synchronization mechanisms.