Create a view on the table.
Create an index on the table.
Create a synonym on the table.
Add a virtual column to the table.
Update the table using the UPDATE statement.
Delete rows in the table using the DELETE command
第1题：
Which two statements are true regarding views?（）
第2题：
Which two operations can be flashed back using the Flashback technology？（）
第3题：
You have altered a non-unique index to be invisible to determine if queries execute within an acceptable response time without using this index.Which two are possible if table updates are performed which affect the invisible index columns?（）
A. The index remains invisible.
B. The index is not updated by the DML statements on the indexed table.
C. The index automatically becomes visible in order to have it updated by DML on the table.
D. The index becomes unusable but the table is updated by the DML.
E. The index is updated by the DML on the table.
第4题：
Which two operations can be performed on an external table（）
第5题：
Which two operations can be performed on an external table（）
第6题：
You are responsible for a data warehouse application that uses records from an external table to update one of the dimension tables periodically. The records in the external table may contain data for new rows in the dimension table， or for updates to its existing rows. Which type of SQL command would you use to transfer the data from the external table to the dimension table as efficiently as possible？（）
第7题：
Which two statements are correct regarding the Flashback Versions Query feature？（）
第8题：
A warehouse fact table in your Oracle 12c Database is range-partitioned by month and accessed frequently with queries that span multiple partitions The table has a local prefixed, range partitioned index. Some of these queries access very few rows in some partitions and all the rows in other partitions, but these queries still perform a full scan for all accessed partitions. This commonly occurs when the range of dates begins at the end of a month or ends close to the start of a month. You want an execution plan to be generated that uses indexed access when only a few rows are accessed from a segment, while still allowing full scans for segments where many rows are returned. Which three methods could transparently help to achieve this result?（）
第9题：
Which statement describes the effect on an index， when the indexed column for the rows is updatedin the base table（）
第10题：
The SCOTT user has an index on the ITEM_DESC column of the ITEM table. As part of the year-ending task， SCOTT updates the ITEM_DESC column for most of the rows in the ITEM table. How does this change to the table affect the index？（）