Scenario: A data analyst needs to generate a report from a DB2 database that requires extracting data from multiple tables using complex joins and subqueries. How can the analyst ensure the accuracy and efficiency of the SQL query?
- Testing the query with various dataset sizes
- Using EXPLAIN to analyze the query execution plan
- Utilizing SQL performance monitoring tools
- Validating query results against sample data
Using EXPLAIN to analyze the query execution plan helps the analyst understand how DB2 processes the query and identifies potential areas for optimization. This information allows for fine-tuning the SQL query to improve both accuracy and efficiency.
Loading...
Related Quiz
- Triggers in DB2 can be classified based on their ________.
- In SQL, what is the significance of the ORDER BY clause in a SELECT statement?
- Analyzing and optimizing the ________ can lead to better overall DB2 performance.
- In DB2, what is the purpose of the ROLLFORWARD command?
- What factors should be considered before running the Reorg utility in DB2?