Database migration is basically keeping any changes you want to make to your database into code and the code that undo the changes you made. This will help you to revert changes you made to the database anytime you want and more over if you have testing and production environment deploying database changes into production is done by just running a script.
This is my note for the book grokking algorithms. It is really a nice book. It gives most of the fundamental concepts in simple terms. My number one recommendation for any one who is starting data stractures and algorithms.
At the time of writing Zero ETL is an integration tool that makes transactional data available in Redshift in near real time. This is useful if real time analytical data in Redshift is necessary. It support Aurora and RDS MySQL as data source.
This note consists of fundamental of data, fundamental of SQL, traditional databases, big data and distributed cloud storages and query engines.