請參閱 Delta Lake merge的自動架構演進。 只有相符子句的合併作業效能,也就是只有 update和 動作, delete 而且沒有 insert 動作,已改善。 Hive 中繼儲存庫中參考的 Parquet 表格現在可以透過其表格標識符使用 CONVERT TO DELTA轉換為 Delta Lake。 雖然這項功能先前已在 Databricks Runtime 6.1 中宣佈,但完全支援...
轉換數據表之後,請確定所有寫入都會經過 Delta Lake。多個外部數據表有可能共用相同的基礎 Parquet 目錄。 在此情況下,如果您在其中一個外部數據表上執行 CONVERT,您將無法存取其他外部數據表,因為其基礎目錄已從 Parquet 轉換成 Delta Lake。 若要再次查詢或寫入這些外部數據表,您也必須對其執行 CONVERT。
了解在将 Parquet 数据湖迁移到 Azure Databricks 上的 Delta Lake 之前的注意事项,以及 Databricks 建议的四个迁移路径。
Delta Lake에 Parquet 및 Iceberg 테이블을 증분 방식으로 복제하는 방법을 알아봅니다.
Two parties are involved in the Delta Sharing model: the data provider and data recipient. Zaharia explained that the data provider can start with an existing table it already has in the Delta Lake format. Delta Sharing also supports theApache Parquetformat, which is widely used for data...
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Parquet, the most popular open format for large data storage, has gone through multiple iterations of improvements. One of the main motivations for us introducing Delta Lake was to introduce additional capabilities that were difficult to do at the Parquet layer. Delta Lake brought additional ...
Apache Parquet is acolumnar file formatthat provides optimizations to speed up queries and is a far more efficient file format than CSV or JSON. Table Batch Read and Writes Delta Lake supports most of the options provided by Apache Spark DataFrame read and write APIs for performing batch reads...
5. Delta Lake is Open-source. Builds upon standard data formats: It is powered primarily by parquet format. Optimized for cloud object storage. Built for scalable metadata handling. 6. Conclusion The primary objective of delta lake is resolving the time taken for quickly returnable queries and ...
Delta数据文件:Parquet文件; Delta事务日志 _delta_log:包含 Meta Data 以及事务操作历史; 2. Transaction Log概念 Transaction Log(事务日志,也称 Delta Log)是一种有序记录集,顺序记录了Delta Lake表从初始创建以来的所有事务操作。 3. Transaction Log设计目标 ...