To filter a column
|»||Click to the right of the column header and select a filtering option.|
Note: When filtering is applied to columns, displays to the right of the column header. A Filter panel also displays at the bottom of the grid that describes applied filters as illustrated in the following:
Click in the Filter panel to clear a filter or right-click a filtered column and select Clear Filter.
Click in the Filter panel to enable or disable a filter.
Click in the Filter panel to select a previously defined filter.
You can use SQL Rewrite sessions in Optimize SQL to generate index alternatives for your original SQL statement. SQL Optimizer analyzes the following in your SQL statement and table references to generate alternatives:
Once SQL Optimizer generates index alternatives, you can test them to evaluate improvements in database performance.
SQL Optimizer does not physically create indexes on your database when generating alternatives.
SQL Optimizer compares the virtual execution plans for each index generated and selects the best index for each unique execution plan. SQL Optimizer automatically eliminates the other indexes with duplicate execution plans.
Index generation requires Oracle 8i or later and use of the Oracle cost-based optimizer. If you use the rule-based optimizer, cost-based optimization is performed using the ALL_ROWS or FIRST_ROWS hints. SQL Optimizer requires the use of these hints to create virtual indexes in Oracle. If your SQL statement uses the rule hint /*+RULE*/, you must remove the hint before using SQL Optimizer to generate index alternatives.
You can use Analyze Impact to test the impact of the index alternatives on the execution plans of your SQL statements before you physically create the indexes on your database. Analyze Impact evaluates the impact of the index alternatives generated and identifies the effected SQL statements.
You can use a SQL Rewrite session in Optimize SQL to generate index alternatives for your original SQL statement. Then test the index alternatives to evaluate improvements in database performance.
To generate index alternatives
Tip: Click to stop (or interrupt) the index generation process. See Stop and Resume the Optimization Process for more information.
Select Index Details in the SQL Information pane to view index generation information.
Note: When you generate virtual index alternatives, SQL Optimizer does not retrieve the execution plan for the SQL statement because it does not physically create the indexes on the database. See Retrieve Execution Plans for more information.