Which of the following techniques involves pre-aggregating data to improve the performance of subsequent queries in the ETL process?
- Data Deduplication
- Data Profiling
- Data Sampling
- Data Summarization
Data summarization involves pre-aggregating or summarizing data, usually at a higher level of granularity, to improve query performance in the ETL process. This technique reduces the amount of data that needs to be processed during queries, resulting in faster and more efficient data retrieval.
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