Columnar, Graph and Spatial Databases are three data models built for three kinds of questions: totals over many rows, paths through relationships, and distances between places. This post explains each one and builds all three in SQL Server 2025 with columnstore, graph tables and the geography type.
Key-Value and Document Databases: When Each One Fits
Key-Value and Document Databases are two NoSQL models. One finds a value by its key, the other stores a whole JSON document you can query by any field. This post shows when each one fits and builds both patterns in SQL Server 2025 with a key-value table and the json data type.
What Is Replication in SQL Server?
Replication in SQL Server copies chosen tables to other servers and keeps them current. Publisher, distributor and subscriber in plain words, the three kinds, and why replication is not high availability or a backup.
OLTP vs OLAP: Why Transactions and Analytics Need Different Designs
OLTP vs OLAP is the difference between recording what’s happening now and studying what’s already happened. This post compares the two designs, tests the same 500,000 orders as a rowstore and a columnstore table on SQL Server 2025, and shows how data moves from one side to the other.
What Is NewSQL? Distributed SQL Databases Explained
What is NewSQL? It’s the name for relational databases that spread data over many servers and still give you SQL and ACID transactions. This post walks one orders table through key ranges, replicas and a majority vote.
Relational Database in Big Data: Still at the Center
The relational database in big data projects is still the system of record, and most analytics platforms copy their core business data from it. This post shows what a relational database does well, where it sits in a modern platform, and how the SQL Server 2025 json type adds a flexible schema next to ordinary tables.
MapReduce Explained: Map, Shuffle and Reduce Step by Step
MapReduce splits a big job into many small map tasks, moves the results by key in a shuffle, and adds them up in reduce tasks. This post walks one word count through every step, with a recreated diagram and the same idea in T-SQL.