📘 Introduction In Apache Spark, performance often hinges on one crucial process — shuffle. Whenever Spark needs to reorganize data across the cluster (for example, during a groupBy, join, or repartition), it triggers a shuffle: a costly exchange of data between executors. Shuffle is what makes distributed computation possible — but it’s...
📘Introduction In this hands-on dbt tutorial, you’ll learn how to make your SQL transformations dynamic and reusable by using Jinja loops inside CASE statements. This approach helps you replace repetitive SQL logic with concise, maintainable code — a valuable skill for any Data Engineer. 🎓 Preparing for dbt Analytics Engineering Certification?...
📘 Introduction Apache Spark is a distributed data processing framework designed for speed and scalability. When you run a Spark job, it doesn’t just run on your laptop — it coordinates multiple machines working together to process massive datasets in parallel. To understand how Spark does this so efficiently, you need...
📘Introduction In this hands-on dbt tutorial, you'll learn how to use Jinja for loops inside your dbt models to make your SQL code more dynamic and automated. Instead of manually repeating similar SQL logic for multiple columns, tables, or conditions — you can use for loops with Jinja to...
📘 Introduction When you run a PySpark job, Spark doesn’t immediately execute each transformation. Instead, it constructs something called a DAG (Directed Acyclic Graph) — a roadmap of all the operations that need to happen. This DAG is the heart of Spark’s execution engine. It tells Spark how your data...
📘 Introduction In this hands-on dbt tutorial, you'll learn how to overwrite project variables at runtime — a powerful feature that lets you dynamically change your dbt model behavior without modifying your code or dbt_project.yml. This is especially useful when you need to run the same transformation logic...
📘 Introduction When working with large datasets in PySpark, joins can easily become performance bottlenecks. This happens because Spark needs to shuffle data across the cluster to match rows between DataFrames — a costly operation when both datasets are big. If one of your DataFrames is small, though, there’s a faster...
📘Introduction In this tutorial, you'll learn how GraphQL and REST differ and why developers choose one over the other. Whether you’re building modern web apps or managing large datasets, understanding these differences is essential for efficient, scalable applications. 🟣 GraphQL GraphQL (Graph Query Language) is a query language...
📘 Introduction In this hands-on dbt tutorial, you'll learn how to use project variables to make your SQL models more dynamic, flexible, and reusable. Instead of hardcoding values directly into your SQL logic, dbt allows you to define variables in your dbt_project.yml file. These variables can be...
