多选题On your Oracle 12c database, you Issue the following commands to create indexes SQL CREATE INDEX oe.ord_customer_ix1 ON oe.orders (customers_id, sales_rep_id) INVISIBLE; SQL CREATE BITMAP INDEX oe.ord_customer_ix2 ON oe.orders (customers_id, sales_rep
题目
多选题
On your Oracle 12c database, you Issue the following commands to create indexes SQL > CREATE INDEX oe.ord_customer_ix1 ON oe.orders (customers_id, sales_rep_id) INVISIBLE; SQL> CREATE BITMAP INDEX oe.ord_customer_ix2 ON oe.orders (customers_id, sales_rep_id); Which two statement are correct?（）
A
Both the indexes are created; however, only the ORD_COSTOMER index is visible.
B
The optimizer evaluates index access from both the Indexes before deciding on which index to use for query execution plan.
C
Only the ORD_CUSTOMER_IX1 index is created.
D
Only the ORD_CUSTOMER_IX2 index is created.
E
Both the indexes are updated when a new row is inserted, updated, or deleted In the orders table.
