partition key which describes the partition in which the item will be stored. The Type is the sort key, which determines the order in which items will be stored in disk. The combination of the Partition Key and the Sort Key forms a unique primary key, which maps to a single value in ...
DynamoDB uses the partition key’s value as an input to an internal hash function. The output from the hash function determines the partition in which the item is stored. Each item’s location is determined by the hash value of its partition key. All items with the same partition key are...
What is a hotkey in DynamoDB? Hotkeys inDynamoDBfrom AWS refer to a partition key value that experiences a high volume of read-or-write requests. This often triggers uneven data distribution that will impact performance. Strategies likesharding, using composite partition keys and adjusting capac...
7. Amazon DynamoDB partitions In DynamoDB, data is partitioned automatically by its hash key. That’s why you will need to choose a hash key if you're implementing a GSI. The partitioning logic depends upon two things: table size and throughput. The partition for a table is calculated by...
partitionability, key-value databases are capable of horizontal scaling at scales that other types of databases are unable to achieve. For example, if an existing partition reaches its maximum capacity and additional storage space is required, Amazon DynamoDB will allocate additional partitions to the...
In the example below, we have a DynamoDB table that contains actors and the movies in which they have played. The primary key is a composite primary key where the partition key is the actor's name and the sort key is the movie name. You can see there are two items for Tom Hanks -...
Amazon DynamoDB Riak Oracle NoSQL Some tabular NoSQL databases, like Cassandra, can also service key-value needs. Document databases Document databases expand on the basic idea of key-value stores where “documents” are more complex, in that they contain data and each document is assigned a ...
Eventual consistency is a common weak NoSQL consistency model employed by manyNoSQL databases. It allows for replicas of data to diverge temporarily but guarantees that, if no new updates are made to a data item, all replicas will eventually converge to the same value. This convergence typically...
How many Kinesis shards do I need in Kinesis Data Stream? CloudFront FunctionsOpen all What is CloudFront Functions? How do I customize content with CloudFront Functions? What are the use cases for CloudFront Functions? What is CloudFront KeyValueStore? What are the use cases for CloudFront Key...
A distributed key value database can be configured to store the same data in multiple nodes across locations. If a single node fails, the data is still available. You don’t have to wait for the database to be restored. A geo-distributed database maintains concurrent nodes across geographica...