AWS Certified Data Engineer – Associate DEA-C01 Exam Learning Path Just cleared the AWS Certified Data Engineer – Associate DEA-C01 exam with a score of 930/1000. AWS Certified Data Engineer – Associate DEA-C01 exam is the latest AWS exam released on 12th March 2024. AWS Certified Data Engineer – Associate DEA-C01 Exam Content Data Engineer exam validates skills and knowledge in core data-related AWS services, ability to ingest and transform data, orchestrate data pipelines while applying programming concepts, design data models, manage data life cycles, and ensure data quality. Exam also ..read more

Amazon RDS Blue/Green Deployments Amazon RDS Blue/Green Deployments help make and test database changes before implementing them in a production environment. RDS Blue/Green Deployment has the blue environment as the current production environment and the green environment as the staging environment. RDS Blue/Green Deployment creates a staging or green environment that exactly copies the production environment. Green environment is a copy of the topology of the production environment and includes the features used by the DB instance including the Multi-AZ deployment, read replicas, the storage ..read more

RDS Automated Backups vs Manual Snapshots Amazon RDS Automated Backups are AWS Initiated. Backups are created automatically as per the defined backup window. Backups are also created when a read replica is created. Amazon RDS DB snapshots are manual, user-initiated backups that enable a DB instance backup to be restored to that specific state at any time. Instance Deletion & Backup Retention Period Amazon RDS Backups can be configured with a retention period varying from 1 day to a maximum of 35 days. RDS Automated Backups are deleted when the DB instance is deleted. However, RDS can n ..read more

RDS Cross-Region Read Replicas RDS Cross-Region Read Replicas create an asynchronously replicated read-only DB instance in a secondary AWS Region. Supported for MySQL, PostgreSQL, MariaDB, Oracle, and SQL Server Cross-Region Read Replicas help to improve disaster recovery capabilities (reduces RTO and RPO), scale read operations into a region closer to end users, migration from a data center in one region to another region RDS Cross-Region Read Replicas Process RDS configures the source DB instance as a replication source and setups the specified read replica in the destination AWS Reg ..read more

RDS Multi-AZ DB Instance vs DB Cluster Instances & Availability Zones A Single AZ instance creates a single DB instance in any specified AZ. A Multi-AZ DB Instance deployment creates a Primary and a Standby instance in two different AZs A Multi-AZ DB Cluster deployment creates a Primary Writer and two Readable Standby instances in three different AZs Replication Mode Multi-AZ DB instance deployment synchronously replicates the data from the primary DB instance to a standby instance in a different AZ. Multi-AZ DB cluster deployment semi-synchronously replicates data from the writer DB i ..read more

RDS Multi-AZ DB Instance Deployment  RDS automatically creates a primary DB Instance and synchronously replicates the data to a standby instance in a different AZ. RDS performs an automatic failover to the standby, so that database operations can be resumed as soon as the failover is complete. RDS Multi-AZ deployment maintains the same endpoint for the DB Instance after a failover, so the application can resume database operation without the need for manual administrative intervention. Multi-AZ is a High Availability feature and NOT a scaling solution for read-only scenarios; a standby repli ..read more

Choosing the Right Data Science Specialization: Where to Focus Your Skills In the rapidly evolving world of technology, data science stands out as a field of endless opportunities and diverse pathways. With its foundations deeply rooted in statistics, computer science, and domain-specific knowledge, data science has become indispensable for organizations seeking to make data-driven decisions. However, the vastness of this field can be overwhelming, making specialization a strategic necessity for aspiring data scientists. This article aims to navigate through the labyrinth of data science speci ..read more

Kubernetes and Cloud Native Associate KCNA Exam Learning Path I recently certified for the Kubernetes and Cloud Native Associate – KCNA exam. KCNA exam focuses on a user’s foundational knowledge and skills in Kubernetes and the wider cloud native ecosystem. KCNA exam is intended to prepare candidates to work with cloud-native technologies and pursue further CNCF credentials, including CKA, CKAD, and CKS. KCNA validates the conceptual knowledge of the entire cloud native ecosystem, particularly focusing on Kubernetes. Kubernetes and cloud-native technologies, including how to deploy an applic ..read more

DynamoDB with VPC Endpoints By default, communications to and from DynamoDB use the HTTPS protocol, which protects network traffic by using SSL/TLS encryption. A VPC endpoint for DynamoDB enables EC2 instances in the VPC to use their private IP addresses to access DynamoDB with no exposure to the public internet. Traffic between the VPC and the AWS service does not leave the Amazon network. EC2 instances do not require public IP addresses, an internet gateway, a NAT device, or a virtual private gateway in the VPC. VPC endpoint for DynamoDB routes any requests to a DynamoDB endpoint withi ..read more

DynamoDB Time to Live – TTL DynamoDB Time to Live – TTL enables a per-item timestamp to determine when an item is no longer needed. After the date and time of the specified timestamp, DynamoDB deletes the item from the table without consuming any write throughput. DynamoDB TTL is provided at no extra cost and can help reduce data storage by retaining only required data. Items that are deleted from the table are also removed from any local secondary index and global secondary index in the same way as a DeleteItem operation. Expired items get removed from the table and indexes within about 48 h ..read more