What role does query execution plan play in performance tuning in DB2?
- It ensures database normalization
- It outlines the steps the database will take to execute a query
- It rewrites SQL queries
- It stores all the indexed columns
The query execution plan in DB2 outlines the steps the database engine will take to execute a particular query. Understanding and analyzing this plan is crucial for performance tuning as it helps identify potential bottlenecks, optimize resource usage, and improve overall query performance by choosing the most efficient execution path.
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