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Some of the key notes related to S3 from AWS documentation Amazon S3 has a simple web services interface that can be used to store and retrieve any amount of data, at any time, from anywhere on the web. Amazon S3 Data Consistency Model Amazon S3 provides  read-after-write consistency for PUTS of new objects  in your S3 bucket in all Regions with one caveat. The caveat is that if you make a HEAD or GET request to the key name (to find if the object exists) before creating the object, Amazon S3 provides eventual consistency for read-after-write. Amazon S3 offers  eventual consistency for overwrite PUTS and DELETES  in all Regions. Updates to a single key are atomic . For example, if you PUT to an existing key, a subsequent read might return the old data or the updated data, but it never returns corrupted or partial data. Amazon S3 achieves high availability by replicating data across multiple servers within AWS data centers. If a PUT request is successful...

Global Network of AWS Regions Availability Zones means group of Data Centers who are all interconnected to provide high availability and redundancy and are geographically in close proximity. Regions is a geographical area with 2 or more availability zones. AWS at present has: 69 Availability Zones  22 geographic regions  New regions and AZ has been announced: 9 more Availability Zones and  3 more Regions in Cape Town, Jakarta, and Milan North America The AWS Cloud in North America has 21 Availability Zones within six geographic Regions, with 44 Edge Network locations and two Regional Edge Cache locations. Edge Locations: Ashburn, VA (3);  Atlanta GA (3);  Boston, MA;  Chicago, IL (2);  Dallas/Fort Worth, TX (5);  Denver, CO (2);  Hayward, CA;  Jacksonville, FL;  Los Angeles, CA (4);  Miami, FL (3);  Minneapolis, MN;  Montreal, QC;  New York, NY (3);  Newark, N...

AWS Certified Cloud Practitioner AWS is the most used cloud platform in the world and as most of the jobs are focused on cloud based technologies it makes perfect sense to get certified on AWS cloud. The first entry level certification is called as AWS Certified Cloud Practitioner. You can find the details of various certifications on the AWS page https://aws.amazon.com/certification/certified-cloud-practitioner/ In the following blogs I will provide information on various training's and preparations required for this entry level certification. Main topics for the AWS Certified Cloud Practitioner exam are: AWS Infrastructure Compute Storage Database Cloud Migration Network Content Delivery CDN Security Identity Compliance Costing AWS Free Tier AWS has a free tier which provides access to various AWS products. You can use it to explore more than 60 products. Three different types of free offers are available depending on the product used. Check the...