DynamoDB – Indexes DynamoDB uses indexes for primary key attributes to improve accesses. They accelerate application accesses and data retrieval, and support better performance by reducing application lag. Secondary Index A secondary index holds an attribute subset and an alternate key. You use it through either a query or scan operation, which targets the index. […]

DynamoDB – Scan Scan Operations read all table items or secondary indices. Its default function results in returning all data attributes of all items within an index or table. Employ the ProjectionExpression parameter in filtering attributes. Every scan returns a result set, even on finding no matches, which results in an empty set. Scans retrieve […]

DynamoDB – Batch Writing Batch writing operates on multiple items by creating or deleting several items. These operations utilize BatchWriteItem, which carries the limitations of no more than 16MB writes and 25 requests. Each item obeys a 400KB size limit. Batch writes also cannot perform item updates. What is Batch Writing? Batch writes can manipulate […]