Articles

Affichage des articles du mars, 2024

Demystifying Big Data: The Power of Delta Tables (Part 2)

Image
     1.Introduction Building on the core concepts in Part 1, we'll now explore advanced functionalities like partition pruning and schema evolution. Beginners will gain a solid grasp, while experts will find in-depth explanations and code examples to push Delta Tables' limits. Get ready to unlock the Delta Log's magic, master time travel, optimize performance, and more! We'll delve into features like CDC and schema evolution for flexible data management.     2. Delta Log: The Heart of Delta Tables At the core of Delta Tables lies the Delta Log, a powerful transactional log that meticulously records every data operation – inserts, updates, and deletes – performed on your table. This comprehensive log serves as the backbone for several key functionalities. Firstly, it ensures ACID transactions, guaranteeing data consistency by ensuring all operations are completed successfully or not at all. Secondly, the Delta Log empowers you with time travel capabilitie...

Demystifying Big Data: The Power of Delta Tables (Part 1)

Image
    1. Introdu ction The age of big data is upon us. Businesses are generating massive amounts of information from various sources, including customer transactions, sensor data, and social media interactions. This data holds immense potential for uncovering valuable insights, but traditional data storage solutions often struggle to keep up. Here's where Delta Tables come in, offering a revolutionary approach to managing big data in data lakes.     2. What are Delta Tables? Imagine a giant warehouse for all your company's information, but instead of just throwing everything in a pile, Delta Tables are like shelves and filing cabinets that keep things organized. Developed in 2019, they help manage massive amounts of data (big data) more easily and reliably. Unlike a regular warehouse, Delta Tables even let you see how the information looked at any point in time, like rewinding a movie! Visualize a well-organized storage unit. The bottom layer, textured like...

Selective Parquet Writing in Azure Synapse Analytics Dataflows using Dynamic File Names

Image
Purpose: The purpose of this article is to demonstrate how to create a data flow in Azure Synapse Analytics that efficiently processes data while considering the existence of specific files. By implementing dynamic file name construction and utilizing metadata checks, the data flow ensures that only relevant data is processed, thereby improving efficiency and maintaining data integrity. This approach is particularly useful for scenarios where historical data needs to be preserved, and only the latest partition needs to be processed. Through step-by-step instructions and code examples, readers will learn how to implement this dynamic data processing solution in their Azure Synapse Analytics environment. When to Use This Method: Specifically applicable for Parquet files (not delta). Ideal for scenarios where it's necessary to retain all historical data without refreshing them. Suitable when all columns in the output file need to be preserved (common partitioning may cause used column...