w3resource

Optimize SQL Performance with Query Tuning Exercises with Solutions


This resource offers a total of 100 SQL Performance Tuning and Optimization problems for practice. It includes 20 main exercises, each accompanied by solutions, detailed explanations, and four related problems.


1. Writing Efficient Queries by Avoiding Unnecessary Joins

Write a SQL query to retrieve data without unnecessary joins.

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2. Using Indexes to Improve Query Performance

Write a SQL query to create an index on a frequently queried column.

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3. Analyzing Query Execution Plans

Write a SQL query to analyze the execution plan of a query.

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4. Avoiding SELECT * for Better Performance

Write a SQL query to retrieve only specific columns instead of using SELECT.

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5. Using Covering Indexes for Faster Queries

Write a SQL query to create a covering index for a query.

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6. Optimizing Queries with WHERE Clauses

Write a SQL query to optimize filtering with a WHERE clause.

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7. Using EXISTS Instead of IN for Subqueries

Write a SQL query to replace IN with EXISTS for better performance.

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8. Partitioning Large Tables for Improved Performance

Write a SQL query to partition a large table.

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9. Updating Statistics for Query Optimization

Write a SQL query to update statistics for a table.

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10. Using Temporary Tables for Intermediate Results

Write a SQL query to use a temporary table for intermediate results.

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11. Using Query Hints for Performance Optimization

Write a SQL query to use query hints to optimize performance.

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12. Optimizing Queries with Window Functions

Write a SQL query to replace self-joins with window functions for better performance.

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13. Reducing Lock Contention with NOLOCK Hint

Write a SQL query to use the NOLOCK hint to reduce lock contention.

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14. Optimizing Aggregations with Indexed Views

Write a SQL query to create an indexed view for faster aggregations.

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15. Using Parameterized Queries to Prevent Re-compilation

Write a SQL query to use parameterized queries for consistent execution plans.

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16. Optimizing Joins with Proper Indexing

Write a SQL query to optimize joins by ensuring proper indexing.

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17. Using Stored Procedures for Query Reuse

Write a SQL stored procedure to encapsulate and reuse a frequently executed query.

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18. Optimizing Bulk Inserts with Minimal Logging

Write a SQL query to perform a bulk insert with minimal logging.

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19. Using Compression to Reduce Storage and Improve I/O

Write a SQL query to enable data compression for a table.

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20. Analyzing Wait Statistics for Bottleneck Identification

Write a SQL query to analyze wait statistics for identifying performance bottlenecks.

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More to Come !

Do not submit any solution of the above exercises at here, if you want to contribute go to the appropriate exercise page.



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