Which pseudocolumn could you use to identify a unique row in a Flashback Versions Query？（）

A. XID
B. VERSIONS_PK
C. VERSIONS_XID
D. VERSIONS_UNIQUE

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单项选择题

Which of the following statements best describes Flashback Versions Query？（）

A. Flashback Versions Query is used to make changes to multiple versions of data that existed between two points in time.
B. Flashback Versions Query is used to view all version changes on rows that existed between the time the query was executed and a point in time in the past.
C. Flashback Versions Query is used to view version changes and the SQL to undo those changes on rows that existed between two points in time.
D. Flashback Versions Query is used to view all version changes on rows that existed between two points in time.

多项选择题

Users notify you that their application is failing every time they try to add new records. Because of poor application design， the actual ORA error message is unavailable.
What might be the problem？（）

A. The application user has exceeded their undo quota.
B. The FLASHBACK GUARANTEE option is set on the undo tablespace.
C. The table is currently being queried by a Flashback Transaction Query operation.
D. The table is currently being queried by a Flashback Versions Query operation.
E. The RETENTION GUARANTEE option is set on the undo tablespace.

多项选择题

In order to perform Flashback Transaction Query operations， which of these steps are required？（）

A. Ensure that database is running with version 10.1 compatibility.
B. Enable Flashback Logging.
C. Enable Supplemental Logging.
D. Ensure that the database is running with version 10.0 compatibility.
E. Ensure that the database is in ARCHIVELOG mode.

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