Author: k A

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 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…

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…

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…

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…

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…

Deleting an item in the DynamoDB only requires providing the table name and the item key. It is also strongly recommended to use of a conditional expression which will be…

Updating an item in DynamoDB mainly consists of specifying the full primary key and table name for the item. It requires a new value for each attribute you modify. The…

Retrieving an item in DynamoDB requires using GetItem, and specifying the table name and item primary key. Be sure to include a complete primary key rather than omitting a portion.…

Creating an item in DynamoDB consists primarily of item and attribute specification, and the option of specifying conditions. Each item exists as a set of attributes, with each attribute named…