[多选题]On your Oracle Database, you issue the following c Both the indexes are updated when a row is inserted, updated, or deleted in the ORDERS table. The ORD_CUSTOMER_IX1 index is not used by the optimizer even when the OPTIMIZER_USE_INVISIBLE_INDEXES parameters is set to true. Both the indexes are created: however, only ORD_CUSTOMERS_IX2 is used by the optimizer for queries on the ORDERS table. 确定

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