Is DynamoDB good for transactional?
DynamoDB transactions provide developers atomicity, consistency, isolation, and durability (ACID) across one or more tables within a single AWS account and region. Many use cases are easier and faster to implement using transactions, for example: Processing financial transactions.
How is DynamoDB charged?
DynamoDB charges per GB of disk space a table consumes. The first 25 GB consumed per month is free, and prices start at $0.25 per GB-month thereafter.
What is DynamoDBMapper?
The DynamoDBMapper class enables you to access your tables; perform various create, read, update, and delete (CRUD) operations; and run queries. The DynamoDBMapper class does not allow you to create, update, or delete tables. To perform those tasks, use the low-level SDK for Java interface instead.
What is a transactional write?
Transactional writing is a collective term for non-fiction writing genres that aim to communicate with others for a specific purpose.
Is DynamoDB ACID compliant?
DynamoDB is not ACID compliant. It only provides the ‘C’ (consistency) and ‘D’ (durability) in ACID. Here is an example of how to achieve ACID on top of DynamoDB, but this makes the application architecture very complex.
Does DynamoDB support atomic transactions?
DynamoDB transactions are used to support mission-critical applications that require an all-or-nothing approach, even if there’s a disruption to the system. They allow cloud engineers to implement complicated business logic into a single atomic transaction, which can be made up of multiple related tasks.
Why is DynamoDB so expensive?
To sum up, poorly chosen partition keys, the wrong capacity mode, and overuse of scans and global secondary indexes are all causes of skyrocketing DynamoDB costs as applications scale.
Is DynamoDB query expensive?
Scans and Queries are Expensive! Scanning and querying DynamoDB tables counts against your provisioned read capacity, meaning costs are relative to the size of the number of items being scanned – not the number of results being returned. This can get quite expensive if you need to query your data frequently.
Can DynamoDBMapper query return null?
AWS DynamoDB Mapper query by GSI returns null for all non-key attributes.
Is DynamoDBMapper thread safe?
When using the save, load, and delete methods, DynamoDBMapper will throw DynamoDBMappingException s to indicate that domain classes are incorrectly annotated or otherwise incompatible with this class. This class is thread-safe and can be shared between threads.
What is transactional write DynamoDB?
TransactWriteItems is a synchronous and idempotent write operation that groups up to 25 write actions in a single all-or-nothing operation. These actions can target up to 25 distinct items in one or more DynamoDB tables within the same AWS account and in the same Region.
What are examples of transactional writing?
Transactional writing includes a broad range of text types, such as business letters, friendly emails, invitations, speeches, and interviews.