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What is the usage of Optimize and REORG commands in Databricks?

Spark/Big Datamedium0.5 min readPremium
Frequency
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Asked at 1 company
Category
452
questions in Spark/Big Data
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88E|81M|283H
in this category
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1,863
across 7 categories
Asked at these companies
PWC
Key Concepts Tested
partitionwindow
Expert AnswerPremium
97 wordsInterview-ready
**OPTIMIZE**: Compacts small files in Delta table. Merges files; improves read performance. No Z-order. Run: `OPTIMIZE table_name`. **REORG**: OPTIMIZE + Z-order. Compacts and clusters by columns. Better predicate pushdown for filtered columns. Run: `REORG TABLE table_name APPLY (ZORDER BY (col1, col2))`. **When**: After many small writes. Before large reads. During maintenance window. **Trade-offs**: REORG more expensive; Z-order helps reads on clustered columns....
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