Dynamodb Hash Key Range Key

Using a table s primary key is the most efficient way to retrieve items and avoids using the slow scan operation.

Dynamodb hash key range key. The term range attribute derives from the way dynamodb stores items with the same partition key physically. However the requirement of using a primary key limits the access patterns of a table. A hash key is mandatory in a dynamodb table. This type of primary key is built upon the hashed key and the range key in the table.

Up to this point most read operations have used a table s primary key directly either through the getitem call or the query call. I just want to know how can we query on a table in dynamodb with the hashkey and rangekey. Dynamodb builds an unordered hash index on the hash attribute and a sorted range index on the range attribute. The term hash attribute derives from dynamodb s usage of an internal hash function to evenly distribute data items across partitions based on their partition key values.

This means that every row s primary key is the combination of the hash and range key. The sort key of an item is also known as its range attribute. Partition keys and request throttling. This type of primary key allows for aws s rich query capabilities.

You can make direct gets on single rows if you have both the hash and range key or you can make a query against the sorted range index. The way to fetch multiple items by a primary key query which sounds weird at first is to specify the hash key and then a range on the range key. Partition key a simple primary key composed of one attribute known as the partition key. Designing the table s and keys.

All items with the same partition key are stored together and for composite partition keys are ordered by the sort key value. Dynamodb splits partitions by sort key if the collection size grows bigger than 10 gb. The output from the hash function determines the partition physical storage internal to dynamodb in which the item will be stored. The key is used to uniquely identify an item in a table.

I am new to dynamodb stuff. A hashed index on the hash primary key attribute and a range sort index on the range primary key attribute. Let s say my table is testtable and it s schema is something like this. Dynamodb uses the partition key s value as input to an internal hash function.

Each item s location is determined by the hash value of its partition key. Keys amazon calls them primary keys can be composed of one attribute called a hash key or a compound key called the hash and range key. Learn about secondary indexes with aws dynamodb. It s as if your key is split in two.