[20 Days of DynamoDB] Day 11 - Using pagination with Query API

Posted: 22/Jan/2024

The Query API returns the result set size to 1 MB. Use ExclusiveStartKey and LastEvaluatedKey elements to paginate over large result sets. You can also reduce page size by limiting the number of items in the result set, with the Limit parameter of the Query operation.

Here is an example:

func paginatedQuery(searchCriteria string, pageSize int32) {

    currPage := 1
    var exclusiveStartKey map[string]types.AttributeValue

    for {
        resp, _ := client.Query(context.Background(), &dynamodb.QueryInput{
            TableName:              aws.String(tableName),
            KeyConditionExpression: aws.String("ForumName = :name"),
            ExpressionAttributeValues: map[string]types.AttributeValue{
                ":name": &types.AttributeValueMemberS{Value: searchCriteria},
            },
            Limit:             aws.Int32(pageSize),
            ExclusiveStartKey: exclusiveStartKey,
        })

        if resp.LastEvaluatedKey == nil {
            return
        }
        currPage++
        exclusiveStartKey = resp.LastEvaluatedKey
    }
}

Recommended reading - Query Pagination