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Questions and Answers
What optimization technique can effectively filter data based on the transactionId column after addressing the small files problem?
What optimization technique can effectively filter data based on the transactionId column after addressing the small files problem?
- Perform Optimize with Zorder on transactionId (correct)
- Create BLOOM FILTER index on the transactionId
- Increase the cluster size and enable delta optimization
- Increase the driver size and enable delta optimization
What is the primary purpose of the OPTIMIZE command in the context of Delta Lake?
What is the primary purpose of the OPTIMIZE command in the context of Delta Lake?
- To reduce the number of small files in a Delta table (correct)
- To increase the number of small files in a Delta table
- To create a backup of a Delta table
- To encrypt the data in a Delta table
What is a potential issue if transactionId has high cardinality?
What is a potential issue if transactionId has high cardinality?
- It can improve optimization performance.
- It may reduce the effectiveness of some optimization techniques. (correct)
- It always prevents any optimization.
- It has no impact on optimization techniques.
What do bloom filters do?
What do bloom filters do?
What is the main goal of optimizing queries in a data warehouse environment?
What is the main goal of optimizing queries in a data warehouse environment?
Flashcards
Bloom Filter Index
Bloom Filter Index
A probabilistic data structure used to test whether an element is a member of a set. It can reduce the need to read unnecessary data.
Optimize with Zorder
Optimize with Zorder
A Delta Lake operation that compacts data by reordering it on disk. Optimize with Zorder ensures data locality for efficient filtering.
High Cardinality
High Cardinality
The number of unique values in a column. High cardinality columns may not be ideal for certain optimizations without proper indexing.
Delta Lake Optimize
Delta Lake Optimize
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Data Filtering
Data Filtering
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