Study 2 Amazon RDS in Practice with 12 free online flashcards. Review key terms, definitions, and concepts with this interactive flashcard deck.
What does Amazon RDS manage, and what remains your responsibility?
Amazon RDS is a managed service for running relational database engines; AWS operates much of the underlying infrastructure, while you remain responsible for choices such as schema design and access controls.
When is RDS a better fit than DynamoDB?
Choose RDS when an application needs a relational model, SQL, transactions, joins, and a supported engine. Consider DynamoDB for key-value or document access patterns rather than arbitrary relational joins.
What is the role of a Multi-AZ DB instance standby?
A Multi-AZ DB instance maintains a standby in another Availability Zone for high availability and failover. That standby does not serve application reads.
What instances make up a Multi-AZ DB cluster?
A Multi-AZ DB cluster has one writer and two reader instances across three Availability Zones, providing high availability with additional read capacity.
Why is a read replica not equivalent to a Multi-AZ standby?
Read replicas use asynchronous replication, so they can lag. They can scale reads or provide a replica in another Region, but they are not a substitute for a synchronous high-availability standby.
What is a core network-security practice for production RDS?
Keep production databases private, place them in an appropriate DB subnet group, and allow database traffic only from the application or approved administrative sources through security-group rules.
What do database privileges control versus IAM policies?
Use database users and privileges to control access to data, and IAM policies to control who can manage RDS resources.
How can RDS data be protected at rest and in transit?
Enable encryption at rest when creating the DB instance, and configure clients to use TLS to encrypt connections in transit.
What is the main trade-off of adding a database index?
Indexes can speed up reads, but consume storage and may increase the cost of inserts, updates, and deletes. Add them to address observed workloads, not speculatively.
How should you verify that an index improves a query?
Inspect query plans and actual workload behavior to determine whether an index improves performance; do not assume it helps just because it exists.
What is the maximum automated-backup retention for an RDS DB instance?
Automated backups support point-in-time recovery within the configured retention period. For DB instances, retention can be up to 35 days; setting it to zero disables automated backups.
What happens to the DB instance when you restore a manual snapshot?
Restoring a manual DB snapshot creates a new DB instance. Recovery also requires checking the restored database and directing the application to its endpoint.
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