Julia's coding blog - Practice makes perfect

From January 2015, she started to practice leetcode questions; she trains herself to stay focus, develops "muscle" memory when she practices those questions one by one. 2015年初, Julia开始参与做Leetcode, 开通自己第一个博客. 刷Leet code的题目, 她看了很多的代码, 每个人那学一点, 也开通Github, 发表自己的代码, 尝试写自己的一些体会. She learns from her favorite sports – tennis, 10,000 serves practice builds up good memory for a great serve. Just keep going. Hard work beats talent when talent fails to work hard.

Sunday, May 2, 2021

System design: System Properties Comparison Amazon DynamoDB vs. Microsoft Azure Cosmos DB

May 2, 2021

Here is the link.

Microsoft Azure Cosmos DB -

DocumentDB API
Graph API (Gremlin)
MongoDB API
RESTful HTTP API
Table API

Our visitors often compare Amazon DynamoDB and Microsoft Azure Cosmos DB with MongoDB, Cassandra and Redis.

Editorial information provided by DB-Engines

Name

Description

Hosted, scalable database service by Amazon with the data stored in Amazons cloud

Globally distributed, horizontally scalable, multi-model database service

Primary database model

Document store
Key-value store

Document store
Graph DBMS
Key-value store
Wide column store

Secondary database models

Spatial DBMS

DB-Engines Ranking
Trend Chart

Score	70.07
Rank	#16	Overall
	#2	Document stores
	#2	Key-value stores

Score	34.71
Rank	#25	Overall
	#3	Document stores
	#2	Graph DBMS
	#3	Key-value stores
	#3	Wide column stores

Website

aws.amazon.com/dynamodb

azure.microsoft.com/services/cosmos-db

Technical documentation

docs.aws.amazon.com/dynamodb

docs.microsoft.com/azure/cosmos-db

Developer

Amazon

Microsoft

Initial release

2012

2014

License

commercial

Cloud-based only

yes

DBaaS offerings (sponsored links)

Server operating systems

hosted

Data scheme

schema-free

Typing

yes

Secondary indexes

yes

SQL

SQL-like query language

APIs and other access methods

RESTful HTTP API

DocumentDB API
Graph API (Gremlin)
MongoDB API
RESTful HTTP API
Table API

Supported programming languages

.Net
ColdFusion
Erlang
Groovy
Java
JavaScript
Perl
PHP
Python
Ruby

.Net
C#
Java
JavaScript
JavaScript (Node.js)
MongoDB client drivers written for various programming languages
Python

Server-side scripts

JavaScript

Triggers

yes

JavaScript

Partitioning methods

Sharding

Replication methods

yes

MapReduce

with Hadoop integration

Consistency concepts

Eventual Consistency
Immediate Consistency

Bounded Staleness
Consistent Prefix
Eventual Consistency
Immediate Consistency

Session Consistency

Foreign keys

Transaction concepts

ACID

Multi-item ACID transactions with snapshot isolation within a partition

Concurrency

yes

Durability

yes

User concepts

Access rights for users and roles can be defined via the AWS Identity and Access Management (IAM)

Access rights can be defined down to the item level

More information provided by the system vendor

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