database - How to get item count from DynamoDB?

Question

I want to know item count with DynamoDB querying.

I can querying for DynamoDB, but I only want to know 'total count of item'.

For example, 'SELECT COUNT(*) FROM ... WHERE ...' in MySQL

$result = $aws->query(array(
 'TableName' => 'game_table',
 'IndexName' => 'week-point-index',
 'KeyConditions' => array(
    'week' => array(
        'ComparisonOperator' => 'EQ',
        'AttributeValueList' => array(
            array(Type::STRING => $week)
        )
    ),
    'point' => array(
        'ComparisonOperator' => 'GE',
        'AttributeValueList' => array(
            array(Type::NUMBER => $my_point)
        )
    )
 ),
));
echo Count($result['Items']);

this code gets the all users data higher than my point.

If count of $result is 100,000, $result is too much big. And it would exceed the limits of the query size.

I need help.

Answer 1

With the aws dynamodb cli you can get it via scan as follows:

aws dynamodb scan --table-name <TABLE_NAME> --select "COUNT"

The response will look similar to this:

{
    "Count": 123,
    "ScannedCount": 123,
    "ConsumedCapacity": null
}

notice that this information is in real time in contrast to the describe-table api