AWS DynamoDB
- 2. AWS DynamoDB Is a key-value and document database that delivers single-digit millisecond performance at any scale. It's a fully managed, multiregion, multimaster, durable database with built-in security, backup and restore, and in-memory caching for internet-scale applications. ● DynamoDB was built on the principles in the original Dynamo paper ● Monitoring through CloudWatch ● Maximum item size is 400 KB ● Doesn't have SQL query language available ● Capacity Provisioned and On-demand ● Pay per provisioned capacity and storage usage ● Reads can be eventually consistent or strongly consistent
- 3. Queries and Indexes ● Can only query on primary key, sort key, or indexes ● Global secondary index — partition key and a sort key that can be different from those on the base table, max 5 ● Local secondary index — has the same partition key as the base table, but a different sort key, max 5
- 4. DAX(DynamoDB Accelerator) ● Fully managed, highly available, in-memory cache ● 10x performance improvement ● Reduces request time from milliseconds to microseconds – even at millions of requests per second ● No need for developers to manage caching logic ● Compatible with DynamoDB API calls
- 5. Transactions ● Multiple "all-or-nothing" operations ● Financial transactions ● Fulfilling orders ● Two underlying reads or writes - prepare/commit ● Up to 25 items or 4 MB of data
- 6. On-Demand Capacity ● Pay-per-request pricing ● Balance cost and performance ● No minimum capacity ● When table is idle no charge for read/write — only storage and backups ● Pay more per request than with provisioned capacity ● Use for new product launches
- 7. Backup and Restore ● On-Demand Backup and Restore ● Full backups at any time ● Zero impact on table performance or availability ● Consistent within seconds and retained until deleted ● Point-in-Time Recovery (PITR) ○ Protects against accidental writes or deletes ○ Restore to any point in the last 35 days ○ Incremental backups ○ Not enabled by default ○ Latest restorable: five minutes in the past
- 8. Streams ● Timed-ordered sequence of item-level changes in the table ● Stored for 24 hours ● Inserts, updates and deletes ● Combine with Lamda functions for functionally like stored procedures
- 9. Global Tables ● Managed multi-master, multi-region replication ● Globally distributed applications ● Based on DynamoDB streams ● Multi-region redundancy for DR or HA ● No application rewrites ● Replication latency under one second ● Last writer wins reconciliation between concurrent updates
- 10. Security ● Encryption at rest using KMS ● Site-to-site VPN ● Direct Connect (DX) ● IAM policies and roles ● Fine-grained acess ● CloudWatch and CloudTrail ● VPC endpoints
- 11. Read/Write Capacity Mode and Throughput
- 12. that's it...