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-- AWS RDS Read Replica (console or CLI) aws rds create-db-instance-read-replica \ --db-instance-identifier mydb-replica \ --source-db-instance-identifier mydb-primary -- Promote read replica to standalone (for migration/failover): aws rds promote-read-replica --db-instance-identifier mydb-replica -- Monitor lag in RDS: -- CloudWatch metric: AmazonRDS > ReplicaLag (seconds) -- Multi-AZ (automatic failover, not a read replica): -- aws rds modify-db-instance --multi-az --apply-immediately
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