[AWS] 18-5. Databases in AWS : DynamoDB

[ DynamoDB ]

AWS 소유 기술의 NoSQL DB로 key/value 쌍으로 데이터 저장

멀티AZ, 읽기와 쓰기의 분리, read cache 로 DAX 사용

IAM 을 사용하여 보안

DynamoDB Stream 을 사용하여 AWS Lambda와 통합 (DynamoDB Stream이 데이터 변화 감지하여 AWS Lambda 호출)

백업과 복구 가능, 글로벌 테이블 사용

cloudwatch를 통한 모니터링

SQL 쿼리 불가. 오직 key 및 인덱스 기준 조회만 가능

트랜잭션 지원 (2018. 11월)

- AWS proprietary technology, managed NoSQL database

- Serverless, provisioned capacity, auto scaling, on demand capacity (Nov 2018)

- Can replace ElastiCache as a key/value store (storing session data for example)

- Highly Available, Multi AZ by default, Read and Writes are decoupled, DAX for read cache

- Reads can be eventually consistent or strongly consistent

- Security, authentication and authorization is done through IAM

- DynamoDB Streams to integrate with AWS Lambda

- Backup / Restore feature, Global Table feature

- Monitoring through CloudWatch

- Can only query on primary key, sort key, or indexes

※ Use Case : Serverless applications development (small documents 100s KB), distributed serverless cache, doesn't - have SQL query language available, has transactions capability from Nov 2018

 

[ DynamoDB for Solutions Architect ]

Operations : no operations needed, auto scaling capability, serverless

Security : full security through IAM policies, KMS encryption, SSL in flight

Reliability : Multi AZ, Backups

Performance : single digit millisecond performance, DAX for caching reads, performance doesn't degrade if your application scales

Cost : Pay per provisioned capacity and storage usage (no need to guess in advance any capacity - can use auto scaling)