Query Optimization by Using JOIN Instead of NOT IN
“In this project, I optimized the incremental update strategy for the
core_fct_events
table to address query performance issues in our Enterprise Data Warehouse (EDW) environment. By replacing the inefficientNOT IN
clause with aLEFT JOIN
, I streamlined the duplicate data check process, reducing the overall orchestration time from 50 minutes to 2 minutes. This resulted in approximately a 96% performance improvement, significantly enhancing data processing efficiency and system resource utilization, thereby strengthening service stability and scalability.”