DynamoDB – Permissions API
DynamoDB API offers a large set of actions, which require permissions. In setting permissions, you must establish the actions permitted, resources permitted, and conditions of each. You can specify actions…
DynamoDB – Access Control
DynamoDB uses credentials you provide to authenticate requests. These credentials are required and must include permissions for AWS resource access. These permissions span virtually every aspect of DynamoDB down to…
DynamoDB – Aggregation
DynamoDB does not provide aggregation functions. You must make creative use of queries, scans, indices, and assorted tools to perform these tasks. In all this, the throughput expense of queries/scans…
DynamoDB – Local Secondary Indexes
Some applications only perform queries with the primary key, but some situations benefit from an alternate sort key. Allow your application a choice by creating a single or multiple local…
DynamoDB – Global Secondary Indexes
Applications requiring various query types with different attributes can use a single or multiple global secondary indexes in performing these detailed queries. For example − A system keeping a track of…
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…
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…
DynamoDB – Querying
Queries locate items or secondary indices through primary keys. Performing a query requires a partition key and specific value, or a sort key and value; with the option to filter…
DynamoDB – Batch Retrieve
Batch Retrieve operations return attributes of a single or multiple items. These operations generally consist of using the primary key to identify the desired item(s). The BatchGetItem operations are subject to the…
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…