March 2025
Intermediate to advanced
408 pages
10h 29m
Portuguese (Portugal, Brazil)
Content preview from Guia de estudo do Databricks Certified Data Engineer Associate
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Capítulo 3. Dominando entidades relacionais em Databricks
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As entidades relacionais, particularmente bancos de dados, tabelas e exibições, são componentes essenciais para organizar e gerenciar dados estruturados em Databricks. Entender como essas entidades interagem com o metastore e os locais de armazenamento é crucial para a consulta eficiente e o gerenciamento de dados. Neste capítulo, abordaremos em detalhes como essas entidades funcionam no ambiente do Databricks e entenderemos seu relacionamento com o armazenamento subjacente.
Compreender as entidades relacionais
Esta secção fornece uma compreensão detalhada das entidades relacionais na Databricks, abrangendo bases de dados, tabelas e vistas, com foco nas suas interações com o metastore e os sistemas de armazenamento.
Bases de dados em Databricks
Na Databricks, um banco de dados corresponde essencialmente a um esquema em um catálogo de dados. Isto significa que quando cria uma base de dados, está essencialmente a definir uma estrutura lógica onde as tabelas, vistas e funções podem ser organizadas. Esta coleção de objectos de base de dados é designada por esquema. Tens a flexibilidade de criar uma base de dados utilizando a sintaxe CREATE DATABASE ou CREATE SCHEMA, uma vez que são funcionalmente equivalentes.
Cada espaço de trabalho do Databricks inclui um catálogo de dados local, chamado hive_metastore ...
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