Discoverer 10g-------------------It is reporting tool.Discoverer reports are used for decision making of an organization.Hence it is called Business Intelligence tool.Three components--------------------1) Discoverer Administrator2) Discoverer Desktop3) Discoverer Viewer1) Discoverer Administrator----------------------------------It is used to create EUL ( End User Layer ) and Business Area EUL------It is a logical layer over the database.Discoverer tool communicates to EUL rather than complex database.EUL acts like a insulater and hides complexity of the database.EUL is created by the user "Apps"Business Area-------------------It is collection of tables, used to develop the report.2) Discoverer Desktop-----------------------------It is used to develop reports.Discoverer reports is in the form of rows and columns. They are are called as Workbooks.Discoverer reports are saved with extension .disWe can save teh discoverer report in local machine or in database.3) Discoverer Viewer-------------------------This component is used to view the reports, which are registered in Oracle Apps.Ex:---------Inv_item_id Org_id Item_number Desc Creation_dateCondition: org_id = 207Step 1: Open Discoverer Administrator, create EULStep 2:Create Business AreaName -- INV_BA1-- mtl_system_items_bStep 3: Open Discoverer Desktop, create new report.Save the report with extension ITEM_DETAILS27.disEx 2:------------Invoice ID Vendor_ID Invoice_NUM Invoice AMt Amt_paidCondition: Invoice Amt between 1000 and 2000Step 1:Create Business AreaName: AP_BA1Step 2: Create report and Save.Edit report------------------Sheet ---> Edit sheet++++++++++++++++++++++++++++Adding table to Business AreaInsert ---> Folder ---> From databaseNote: When business area is collection of tables, we need to define join between them.Insert ----> JoinCreating custom folder-------------------------------------Creating folder using the query.