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undo和rollback都是撤销前面的操作，其实是一回事。
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更多 “undo和rollback都是撤销前面的操作，其实是一回事。” 相关考题
考题
You configured an interface with an IP address and committed the change. You then committed a change that added an exception in a firewall filter to allow this network through the filter. You realize that this work was done on the wrong router. How do you undo all these changes?（）A. rollback 2B. rollback 1C. rollback 0D. rollback 3
考题
Whatshouldyoulookatfirsttocomputethenumberofundoblockswrittenpersecondtodisk?()
A.V$UNDOSTATB.V$TRANSACTIONC.V$ROLLSTATD.DBA_UNDO_EXTENTSE.DBA_ROLLBACK_SEGS
考题
You configured an interface with an IP address and committed the change. You then committed a change that added an exception in a firewall filter to allow this network through the filter. You realize that this work was done on the wrong router. How do you undo all these changes?（）A、rollback 2B、rollback 1C、rollback 0D、rollback 3
考题
Which method would you use to undo the changes made by a particular transaction without affecting the changes made by other transactions?（）A、point-in-time recoveryB、execute the ROLLBACK command with transaction numberC、flashback the database to before the transaction was committedD、determine all the necessary undo SQL statements from FLASHBACK_TRANSACTION_QUERY and use them for recovery
考题
What should you look at first to compute the number of undo blocks written per second to disk？ （）A、V$UNDOSTATB、V$TRANSACTIONC、V$ROLLSTATD、DBA_UNDO_EXTENTSE、DBA_ROLLBACK_SEGS
考题
单选题What should you look at first to compute the number of undo blocks written per second to disk？ （）A
V$UNDOSTATB
V$TRANSACTIONC
V$ROLLSTATD
DBA_UNDO_EXTENTSE
DBA_ROLLBACK_SEGS
考题
单选题Which method would you use to undo the changes made by a particular transaction without affecting the changes made by other transactions？（）A
point-in-time recoveryB
execute the ROLLBACK command with transaction numberC
flashback the database to before the transaction was committedD
determine all the necessary undo SQL statements from FLASHBACK_TRANSACTION_QUERY and use them for recovery
考题
单选题You have a long-running process you want to assign to a specific UNDO segment brought online for that express purpose. You are not using automatic UNDO management. What statement can be used for this task? （）A
ALTER DATABASE B
SET TRANSACTION C
ALTER ROLLBACK SEGMENT D
ALTER TABLE
考题
单选题对于ROLLBACK命令，以下准确的说法是（）A
撤销刚刚进行的数据修改操作B
撤销本次登录以来所有的数据修改C
撤销到上次执行提交或回退操作的点D
撤销上一个COMMIT命令
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