What is DynamoDB used for?
DynamoDB has a variety of use cases ranging from simple key-value stores through traditional relational databases and even time series.
Is DynamoDB fast?
It depends. DynamoDB might seem slower than some in-memory stores like Redis but DynamoDB is persistent and has different use cases. It’s "the webscale" where DynamoDB outperforms all traditional relational databases. It has very predictable performance, no matter the size of your dataset, whether it’s only 1GB or 100TB, the speed of reads and writes remains the same, actually, it gets even better with scale. DynamoDB proved to be capable of serving over 45 million requests per second during Prime Day.
Does DynamoDB Support SQL?
Out of the box, no. Fortunately, there are few options to query DynamoDB with SQL:
- Use Athena Federated Queries
- Use dql or some other Open Source solutions
- Soon it will be possible with Dynobase
Is Redis faster than DynamoDB?
It’s comparing apples to oranges. While Redis is in-memory data store, perfect for caches or sessions store, DynamoDB is persistent NoSQL database. While Redis is superfast for small datasets, it gets pricier and pricier.
Is DynamoDB serverless?
Yes, DynamoDB is “serverless” in a sense that you don’t have to manage it or patch and care about underlying servers or software that it runs on. It’s fully administered by AWS and all you need to do is just use it.
Is DynamoDB highly available?
Yes, it’s highly available, scalable, and distributed data store.
Is DynamoDB columnar database?
No. If you’re looking for a columnar database, consider using Redshift.
When to use DynamoDB vs S3?
While S3 is object storage, DynamoDB is NoSQL database. S3 is more suitable for storing large files durably while DynamoDB is rather Key-Value store optimized for huge amount of data and concurrent operations.
Does DynamoDB support atomic updates?
Yes, DynamoDB like many other databases support transactions. With TransactGetItems and TransactWriteItems you can read/write up to 25 items per transaction.
Is DynamoDB eventually consistent?
There are two modes that user can use when working with DynamoDB:
- Strong Consistency (Read-after-Write)
- Eventual Consistency
Is DynamoDB a memory store?
While DynamoDB is not in-memory store, DynamoDB Accelerator (DAX) is an in-memory cache supplementing DynamoDB tables that delivers fast read performance for your tables at scale by enabling you to use a fully managed in-memory cache.
How to Add a Column in DynamoDB?
DynamoDB doesn't have a concept of columns. Each item consists of a Key and the attributes. Because it's a NoSQL database and doesn't have a strict schema, each item can have a different set of attributes, you can write whatever you like in each operation.
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