Intro to Data Analytics Platform

Having been in transactional data world for almost the entire career, recently I have to pick up quite a few things to catch up on the analytical workload. The main purpose of data analytics project is to build analysis services models and manage deployed databases.  Data Model Data are typically organized in relational model for … Read moreIntro to Data Analytics Platform

Cassandra data model (as opposed to relational model)

Bad data model design with Cassandra causes chronic pains as application scales. I had to re-read about data model design in “Cassandra – the Definitive Guide” and keep my notes and thoughts in this post. The data modelling in the relational world is indoctrinated to every students out of university. It embraces several things: Entity-Relation: … Read moreCassandra data model (as opposed to relational model)

Relational Database Normalization

If database migration involves a schema redesign, we need to follow certain forms. I have good instinct what these forms are. However, I got some questions are particular normal forms and I realized that I cannot spell them all out clearly, except that I learned it all in university (10+ years ago). I decided to … Read moreRelational Database Normalization

High level steps for database migration

Database migration may involve many different types, such as hardware platform migration, one technology to another (relational to relational, relational to NoSQL), on-premise to cloud, etc. In this posting, I outline some key steps at high level to a successful database migration, assuming the migration involves changing DBMS platform. Assessment and discovery – this is … Read moreHigh level steps for database migration