The LastEvaluatedKey value allows you to perform this subsequent scan. The 1MB limit applies to returned results, and when you exceed it, another scan becomes necessary to gather the rest of the data. Pagination − DynamoDB paginates results causing division of results into specific pages. The consumption remains the same whether you request every attribute or only a few, and using or not using a filter expression also does not impact consumption. Throughput Specifications − Scans consume throughput, however, consumption focuses on item size rather than returned data. Note − The 1MB limit applies prior to any application of filtering. You cannot use a partition or sort key in a filter expression. Their syntax resembles condition expressions with the exception of key attributes, which filter expressions do not permit. The expressions use comparison operators. Types of Scan Operationsįiltering − Scan operations offer fine filtering through filter expressions, which modify data after scans, or queries before returning results. Note − The parameters and filtering of scans also apply to querying.
Scans retrieve no more than 1MB, with the option to filter data. Employ the ProjectionExpression parameter in filtering attributes.Įvery scan returns a result set, even on finding no matches, which results in an empty set. Its default function results in returning all data attributes of all items within an index or table. Scan Operations read all table items or secondary indices.
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