<ul><li>Amazon DynamoDB stores data in the form of documents (key-value pair), which provides greater flexibility and scalability.</li><li>When creating a table in DynamoDB, you need to define a partition key and optionally a sort key.</li><li>DynamoDB uses the partition key value as input to an internal hash function.</li><li>This mechanism eliminates the need to scan the entire table when performing operations.</li><li>The Query operation is used when you want to fetch items based on a specific partition key value.</li><li>The Scan operation in DynamoDB reads every item in a table or secondary index.</li><li>Global Secondary Index (GSI) in DynamoDB is a secondary index that enables querying a table using non-primary key attributes.</li><li>It’s important to note that GSIs operate on an eventually consistent model.</li><li>GSIs storage is billed separately from the main table, with costs depending on the size of the indexed data and the attributes included in the index.</li><li>By adding GSI on 'UserName' we can make the retrieve operation more efficient.</li></ul>

Getting Started with DynamoDB and Global Secondary Indexes

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