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多选题
Which two statements about Flashback Query are true？（）
A
It is generated by using the redo log files.
B
It helps in row-level recovery from user errors.
C
It can be performed to recover ALTER TABLE statements
D
It fails when undo data pertaining to the transaction is overwritten.
E
The database has to be opened with the resetlogs option after performing Flashback Query.
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更多 “多选题Which two statements about Flashback Query are true？（）AIt is generated by using the redo log files.BIt helps in row-level recovery from user errors.CIt can be performed to recover ALTER TABLE statementsDIt fails when undo data pertaining to the transaction is overwritten.EThe database has to be opened with the resetlogs option after performing Flashback Query.” 相关考题
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考题
单选题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.
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单选题You work as a database administrator at Certkiller .com. You are working in an online transaction processing （OLTP） environment. You realize that the salary for an employee， John， has been accidentally modified in the EMPLOYEEStable. Two days ago， the data was in the correct state. Flashback logs generated during last two days are available in the flash recovery area. Which option would you choose to bring the data to the correct state while ensuring that no other data in the same table is affected？（）A
perform point-in-time recoveryB
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perform a Flashback Database operation to restore the database to the state it was in two days agoD
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perform point-in-time recoveryB
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perform Flashback Versions Query and Flashback Transaction Query to determine all the necessary undo SQL statements， and then use them for recovery
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多选题These are the details about V$FLASHBACK_DATABASE_STAT： SQL DESC v$FLASHBACK_DATABASE_STAT Name Null？ Type ------------- -------- -------------- BEGIN_TIME DATE END_TIME DATE FLASHBACK_DATA NUMBER DB_DATA NUMBER REDO_DATA NUMBER ESTIMATED_FLASHBACK_SIZE NUMBER Which two statements regarding the V$FLASHBACK_DATABASE_STATview aretrue？ （）ABEGIN_TIME is the time at which Flashback logging is enabled.BEND_TIME is the time at which the query is executed on the view.CREDO_DATA is the number of bytes of redo data written during the interval.DThis view contains information about flashback data pertaining to the last 24 hours.EFLASHBACK_DATA is the amount of flashback data generated since the database was opened.
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多选题Which two statements about subqueries are true? （）AA subquery should retrieve only one row.BA subquery can retrieve zero or more rows.CA subquery can be used only in SQL query statements.DSubqueries CANNOT be nested by more than two levels.EA subquery CANNOT be used in an SQL query statement that uses group functions.FWhen a subquery is used with an inequality comparison operator in the outer SQL statement, the column list in the SELECT clause of the subquery should contain only one column.
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单选题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： a） A list of changes made along with the transaction identifier of each change. b） The necessary SQL statements to undo the erroneous changes. Which option would you choose？（）A
RMAN only.B
Flashback Table only.C
Flashback Version Query only.D
Flashback Database and Flashback Transaction Query.E
Flashback Version Query and Flashback Transaction Query.
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