Tag: query‑planning
TPC series - TPC-H Query 2 and 17 - De-correlation
The great promise databases make to programmers is: "Tell me what you want and I will figure out the fastest way to do it." A database is a computer science engine — it knows and...
Introducing the TPC series - TPC-H Query 1: Column Storage and Local Aggregation
After the wonderful feedback on the previous blog about Iceberg - it is now time to switch gears. Databases are more than row storage engines. They are algorithm machines, helping that...
Databases are Just Loops - Part 3: Row and Batch execution
Our database journey makes a brief stop. We need to appreciate an important design decision every database must make: Should I use row or batch execution? Depending on the database - or...
What is Cost in a Query Planner?
If you ever looked at query plan from a SQL databases - you are likely to have come into something called "cost". You may even have heard that most advanced database use based a...