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Oracle Performance Tuning Using SQL Optimization

Excellent Oracle performance tuning results can be achieved by performing SQL Optimization on individual SQL statements.

Guidelines for Oracle Performance Tuning with SQL Optimization

SQL optimization begins with tuning SQL statements. You should begin your process by going to the Oracle library cache. Extract the statements and order them depending on the amount of execution activity. You are now ready for the next steps of SQL optimization:

- Identify High-Impact SQL Statements
Once extracted the SQL statements will be ranked according to the number of executions. The most frequently executed SQL statements are the ones that you should begin with. These statements will have the greatest impact on overall performance.

- Define the SQL Execution Plan
As you identify and rank the SQL statements, you will need to determine their execution plan by using either Oracle’s explain utility or another third-party solution. These tools will parse their execution paths without actually executing the statements. After they are parsed, you can output the results to a plan table. You can now examine the execution paths to determine which statements are performing poorly.

- Tuning the Statements
Now that you’ve determined which statements must be tuned, you can tune the individual statements for better performance. SQL tuning requires that the statements be rewritten according to the rules of efficient SQL.

Tips for More Efficient SQL

Despite the complicated and involved process of Oracle Performance Tuning, writing efficient SQL is a rather straight forward process. They are basic rules that, when followed precisely, can produce a great return on SQL writing efforts. Follow these guidelines for success:

- Rewrite complex subqueries with temporary tables
- EXISTS subqueries are less efficient than minus
- Use decode and case function to reduce the number of times a table must be selected
- Utilize table aliases when referencing columns within tables
- Be aware that index scans are not always faster full-table scans
- Never do a calculation on an indexed column unless you have a matching function-based index

Follow these and other rules for SQL writing to achieve successful results for SQL optimization with your Oracle performance tuning efforts.

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