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Azure Databricks provides tools to simplify the migration of Parquet and Apache Iceberg data into Delta Lake.
| Tool | When to use |
|---|---|
CONVERT TO DELTA SQL command |
This command performs a one-time, in place conversion of Parquet and Iceberg tables into external tables. |
CLONE |
CLONE support for Parquet and Iceberg extends CONVERT TO DELTA functionality to include incremental support for conversion. You can use DEEP CLONE to create Unity Catalog managed tables. |
Databricks recommends storing data using Unity Catalog managed tables, but in-place conversion provides many of the same benefits without needing to fully rewrite all data. Databricks recommends using CLONE if the source system continues to receive updates during the migration.