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单项选择题X 纠错

In one of your online transaction processing （OLTP） applications， users are manipulating and querying a database table simultaneously. From the Segment Advisor， you find that one of the tables is highly fragmented and you want to shrink the table immediately without affecting the currently active queries. Which option would you use with the ALTER TABLE command to achieve this objective？（）

A. REBUILD
B. CASCADE
C. TRUNCATE
D. ROW MOVEMENT
E. SHRINK SPACE COMPACT
F. SHRINK SPACE CASCADE

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You used the following command in Recovery Manager （RMAN） as part of the recovery process： RESTORE CONTROLFILE FROM AUTOBACKUP；
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A. By using the trace file.
B. By using the alert log file.
C. By using the database ID
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By mistake， you ran the batch job （for updating the BILL_DETAILS table） twice. You are not sure which rows in the BILL_DETAILS table were affected. You need to identify：
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b） The necessary SQL statements to undo the erroneous changes.
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A. RMAN only.
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In your production database， you have multiple resource plan directives that refer to the customer group DB_GRP. Which two statements are correct？（）

A. The parallel degree limit for DB_GRP will be the minimum of all the incoming values.
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Because of hardware failure， you decided to drop a redo log member from the database. Which condition should be met to drop a redo log file？（）

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You are working in an online transaction processing （OLTP） environment. You used the FLASHBACK TABLE command to flash back the CUSTOMERS table. Before executing the FLASHBACK TABLE command， the System Change Number （SCN） was 663571. After flashing back the CUSTOMERS table， you realize that the table is not in the correct state and the resultant changes are not what you had desired. So， you need to reverse the effects of the FLASHBACK TABLE command while ensuring that：
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