Specify None in the Item class field. Click the + symbol next to Items using this item class with drill to detail to

9-28 Oracle Fusion Middleware Administrators Guide for Oracle Business Intelligence Discoverer How to delete items and item classes To delete items and item classes:

1.

Select the items or item classes to delete as follows: ■ select the items to delete from the Workarea: Data tab ■ select the item classes to delete from the Workarea: Data tab You can select more than one item or item class at a time by holding down the Ctrl key and clicking another one. 2. Choose Edit | Delete to open the Confirm Delete dialog . 3. optional To see the objects that might be affected by deleting the items or item classes you selected for deletion: a. Click Impact to display the Impact dialog . Figure 9–22 The Impact dialog The Impact dialog enables you to review the other EUL objects that might be affected when you delete an item or item class. Note: The Impact dialog does not show the impact on workbooks saved to the file system in .dis files.

b. optional Select a row in the Impact dialog to view text at the bottom of the

list, indicating what affect the current action will have on the EUL object.

c. Click Close when you have finished reviewing the impact that the deletion

will have.

4. Click Yes to confirm you want to delete the selected items or item classes.

About improving performance when end users select parameter values in worksheets You can improve Discoverer’s performance when end users select values for a parameter, by assigning an indexed item to the folder item on which the parameter is based. Maintaining Items and Item Classes 9-29 The following diagram helps to explain how assigning indexed items to items that are used as parameters in worksheets improves Discoverer’s performance. The diagram shows a typical database schema containing a large fact table Sales Details containing millions of rows, and a much smaller dimension table Products containing just a few rows. Figure 9–23 Part of a typical schema Key to figure: a. Join between Products and Sales Details table

b. Discoverer Plus worksheet using a parameter.

Using the schema above, an end user might select the parameter value Product Description=The Lion King to display rows in a worksheet from the Sales Details table. However, the Sales Details table does not contain a Product Description, only a Product Key. Therefore, to find rows for a specific Product Description in the Sales Details table, Discoverer must first look in the Products table to match the Product Description with its Product Key, and then use the Product Key to return matching rows from the Sales Details table. This operation might be slow when the fact table that you are querying contains hundreds of thousands, or millions of rows. To improve performance, you can specify that when an end user selects a parameter value, Discoverer is able instead to use a number for example, the Product Key associated with the item on which the parameter is based to query the fact table for matching rows. For more information about how to improve Discoverer’s performance when end users select parameter values in worksheets, see How to assign an indexed item to an item . Note: If the item on which a parameter is based is in a complex folder, you must complete the following tasks to improve performance when end users select a value using this parameter: ■ Include an indexed item to be assigned to the item on which the parameter is based in the complex folder. For example, if Product Description is the item in the complex folder on which the parameter is based, you would add the indexed item, Product Key also from the Products folder to the complex folder. For more information, see How to create complex folders . ■ Assign the indexed item, to the item in the complex folder on which the parameter is based.