PostgreSQL: UNIQUE INDEX vs INDEX — A Deep Dive
A UNIQUE INDEX is just a regular B-tree index with an extra uniqueness check on insert. Here's what that means under the hood.
Data Engineering
— Spark, Hadoop, Kafka, and data pipelines
Spark Hadoop: the essential questions you may need to know
In this series of blogs contain some essential questions about Spark and Hadoop, which are frequently being asked in many interviews. At the same time, those Q&A will help you better understand the big data framework, ecoystem, especially know hot to better apply them
Spark多节点配置
Spark - Multinodes - start from 0