Here is a detailed summary of the key takeaways from the video transcription in Markdown format:
Resilience and High Availability
- Resilience: The ability of a workload to recover from infrastructure changes, service disruptions, and mitigate disruptions.
- Resilience is supported by two pillars:
- Availability: The proportion of time a workload is available for use, usually expressed as a historical measure over a period of time.
- Disaster Recovery: Techniques and strategies used to recover a workload in the case of a disaster event, measured by Recovery Time Objective (RTO) and Recovery Point Objective (RPO).
Aurora Resilience Patterns
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Minimal Configuration:
- Single database instance in one Availability Zone with Aurora storage across three Availability Zones.
- Provides durability and availability, but single point of failure.
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Continuous Incremental Backup:
- Aurora continuously backs up database changes to Amazon S3.
- Allows point-in-time recovery within a retention period.
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Aurora Clones:
- Create clones of the production database for testing and development.
- Clones only store changes, reducing storage costs.
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Multi-AZ Configuration:
- Add a secondary instance in a different Availability Zone for failover.
- Provides higher availability with 30-second failover time.
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Read Replicas:
- Add read replicas to offload read traffic and increase read throughput.
- Replicas are kept up-to-date with the primary instance.
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Failover Tiers:
- Configure failover tiers to prioritize which instances to fail over to.
- Ensures the failover instance can handle the workload.
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Connection Management:
- Use the AWS Advanced JDBC driver or Aurora Proxy to handle connection management and failover.
- Improves application resilience to topology changes.
Global Resilience
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Cross-Region Backups:
- Take backups of the database in one region and copy them to another region.
- Provides disaster recovery, but higher RPO (data loss) and RTO (recovery time).
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Aurora Global Database:
- Asynchronous replication of data across multiple AWS Regions.
- Provides low RPO (sub-second) and RTO (under 15 minutes).
- Can have symmetric configurations for faster failover.
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Read Resilience:
- Run read-only workloads in multiple regions for lower latency.
- Use write forwarding to handle writes transparently.
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Consistency Options:
- Session-level consistency: Read your own writes.
- Eventual consistency: Faster reads, but writes may not be immediately visible.
- Global read visibility: Consistent reads across all regions, but higher latency.
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Cross-Account Backups:
- Take backups and store them in a separate AWS account for added protection.
Journey to Global Resilience
- Minimal Configuration
- Continuous Incremental Backup
- Aurora Clones
- Multi-AZ Configuration
- Read Replicas
- Failover Tiers
- Connection Management
- Cross-Region Backups
- Aurora Global Database
- Read Resilience
- Consistency Options
- Cross-Account Backups