python-repository-hub / database-journal

Databases: Concepts, commands, codes, interview questions and more...

Database Journal

This repository is a collection of all-things database. It includes some fundamental concepts of databases, code samples, interview questions and more.

Index:

• Database commands
• Code Samples
• Selecting the right database
• Interview Questions

Database commands

DBMS	Model	Description	Runtime	Link
MySQL	Relational	Mysql basic commands	Shell	link
MongoDB	Document	MongoDB basic commands	Shell	link

Code Samples

This section contains sample codes for database operations. For python, there are several options like mysql-connector, pymysql, MySQLdb, SqlAlchemy, etc.

DBMS	Model	Description	Runtime	Sample Code	Docs
MySQL	Relational	Python mysql connector code sample	Python	link	docs
MySQL	Relational	PyMySQL code sample	Python	link	docs
PostgreSQL	Relational	PostgreSQL using psycopg2 code sample	Python	link	docs
MongoDB	Document	MongoDB NoSQL database code sample	Python	link	docs
SQS	Queue	AWS Simple Queue Service operations	Python	link	docs
ActiveMQ	Queue	MQ Producer and MQ Consumer	Python	link, link	docs
ActiveMQ	Queue	MQ Producer and MQ Consumer	Java	link, link	docs
OracleDB	Relational	OracleDB sample code	Python	link	docs
Kinesis	Stream	AWS Kinesis stream sample code.	Python	link, link	docs
Redis	In-memory	Redis code sample in python.	Python	link	docs
Neo4j	Graph	Graph database using neo4j-driver	Python	link	docs
DynamoDB	Document	DynamoDB basic operations	Python	link	docs
ElasticSearch	Search	ElasticSearch basic operations	Python	link	docs
AWS Neptune	Graph	Connecting to AWS Neptune with Gremlin	Python	link	docs
Cassandra	Wide-column	Cassandra basic operations	Python	link	docs
Amazon Aurora	MySQL	Basic Operations for Aurora DB	Python	link	docs

DBMS comparison chart

This section some characteristics and comparison points between different database technologies.

Property	Relational DB	NoSQL DB	Document DB	In-memory DB	Graph DB	Search DB	Time-series DB	Ledger DB	Queues	Streams
Type	Relational	Non-Relational	Non-Relational	Non-Relational	Relational	Non-Relational	Relational	Non-Relational	Non-Relational	Non-Relational
Data	Structured	Un-structured	Un-structured	Un-structured	Un-structured	Semi-structured	Structured	Chain	Un-structured	Un-structured
Data format	Records, tuples	JSON	JSON	JSON	N/A	JSON	JSON	JSON	Objects	Objects
Scalability	Vertical	Horizontal	Horizontal	Horizontal	Horizontal	Horizontal	Horizontal	Horizontal	Horizontal	Horizontal
Record type	Flat	Hierarchical	Hierarchical	Hierarchical	Hierarchical	Hierarchical	Flat, Hierarchical	Hierarchical	Objects	Objects
Applications	CRM, Finance	Shopping cart	Content Management	Leaderboards	Social media	Product catalog	IoT applications	Cryptocurrency	Queuing tasks	Weather data
Complex queries	Yes	No	No	No	No	No	No	No	N/A	N/A
Property	ACID	CAP theorem	CAP theorem	CAP theorem	CAP theorem	CAP theorem	ACID	N/A	N/A	N/A
Engine(s)	MySQL, PostgresSQL	Cassandra, DynamoDB	MongoDB, DocumentDB	Redis, Memcached	Neo4j	Elasticsearch	InfluxDB	AWS QLDB	ActiveMQ, AWS SQS	Apache Kafka, AWS Kinesis

Contributing

Anyone is welcomed to contribute to this repository. If you would like to make a change, open a pull request. For issues and discussion visit the Issue Tracker. Additional articles and workshops can be found on website.

Disclaimer

The contents of this repository is merely for educational purpose. The content may not be accurate or up-to-date.