AWS Certified Data Engineer Associate DEA-C01 Practice Question
An e-commerce company must move 50 TB of on-premises MySQL data to AWS. Updates will continue on-premises for several months, but analysts want to begin running Amazon Redshift queries immediately. The final architecture will use Redshift local tables. The migration team needs an interim solution that keeps storage costs low and avoids a full reload when the cut-over occurs. Which approach best aligns the storage design with these migration requirements?
Ship MySQL backups on an AWS Snowball Edge, restore them into Amazon RDS for MySQL on AWS, and run Redshift federated queries against the RDS instance until migration is finished.
Export nightly CSV dumps to Amazon S3 and issue a Redshift COPY after each export; perform a final full reload on cut-over day.
Use AWS Database Migration Service to replicate the MySQL data directly into Amazon Redshift tables and let CDC keep the cluster up to date until cut-over.
Use AWS Database Migration Service to replicate the MySQL tables into Amazon S3 in Parquet format. Define Amazon Redshift Spectrum external tables on the S3 data and, at cut-over, COPY the same Parquet files into Redshift local tables.
Replicating to Amazon S3 in columnar Parquet format with AWS Database Migration Service keeps interim storage inexpensive and queryable. Redshift Spectrum can create external tables that point to the same Parquet objects, letting analysts query the dataset while replication is in progress. When the cut-over happens, the COPY command can load the already-existing Parquet files into Redshift local tables without moving or transforming the data again. Replicating directly into Redshift would incur higher storage costs during migration and continuously write to cluster disks. Exporting CSVs or using Snowball plus RDS either requires repeated bulk reloads or adds extra services that will be retired after cut-over.
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What is AWS Database Migration Service (DMS) and how does it work?
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What is Parquet format, and why is it used in data migration?
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What are Amazon Redshift Spectrum external tables and their purpose in migration scenarios?
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What is AWS Database Migration Service (DMS)?
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What is Parquet format and why is it used in this migration method?
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How does Redshift Spectrum work with external tables on S3?
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AWS Certified Data Engineer Associate DEA-C01
Data Store Management
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