单选题In your database， UNDO_RETENTION has been set to 600 sec and UNDO tablespace is configured for RETENTION GUARANTEE. Which statement regarding RETENTION GUARANTEE is true？ （）AUndo data is retained until the next full database backup.BNo committed undo data will be overwritten for 10 minutes.CCommitted undo data will be kept forever if not overwritten within 600 seconds.DGuarantees that requested undo information are available until the instance is shut down.
单选题
In your database， UNDO_RETENTION has been set to 600 sec and UNDO tablespace is configured for RETENTION GUARANTEE. Which statement regarding RETENTION GUARANTEE is true？ （）
A
Undo data is retained until the next full database backup.
B
No committed undo data will be overwritten for 10 minutes.
C
Committed undo data will be kept forever if not overwritten within 600 seconds.
D
Guarantees that requested undo information are available until the instance is shut down.
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In which situation is the UNDO_RETENTION parameter be ignored， even if it is set to a value（）A、When the data file of the undo tablespace is autoextensibleB、When there are more than one undo tablespaces available in the databaseC、When the undo tablespace is of a fixed size and retention guarantee is not enabledD、When the undo tablespace is autoextensible and retention guarantee is not enabled
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单选题In which situation is the UNDO_RETENTION parameter be ignored， even if it is set to a value（）AWhen the data file of the undo tablespace is autoextensibleBWhen there are more than one undo tablespaces available in the databaseCWhen the undo tablespace is of a fixed size and retention guarantee is not enabledDWhen the undo tablespace is autoextensible and retention guarantee is not enabled
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单选题Which statement is true about the UNDO_RETENTION parameter when retention guarantee is notenabled（）AIt is the time period after which the undo data becomes obsolete.BIt is the time period after which the committed undo data would be transferred to a temporarytablespace.CIt is the minimum time period up to which the committed undo data would be retained if free undo spaceis available.DIt is the time period after which the undo data is transferred to the Flash Recovery Area to provide readconsistency.
单选题Which statement is true about the UNDO_RETENTION parameter when retention guarantee is not enabled（）AIt is the time period after which the undo data becomes obsolete.BIt is the time period after which the committed undo data would be transferred to a temporary tablespace.CIt is the minimum time period up to which the committed undo data would be retained if free undo space isavailable.DIt is the time period after which the undo data is transferred to the Flash Recovery Area to provide readconsistency.
单选题In which situation may the UNDO_RETENTION parameter be ignored， even if it is set to a value（）Awhen the data file of the undo tablespace is autoextensibleBwhen there are more than one undo tablespaces available in the databaseCwhen the undo tablespace is of a fixed size and retention guarantee is not enabledDwhen the undo tablespace is autoextensible and retention guarantee is not enabled
单选题The UNDO_RETENTION parameter in your database is set to 1000 and undo retention is not guaranteed. Which statement regarding retention of undo data is correct？（）AUndo data becomes obsolete after 1，000 seconds.BUndo data gets refreshed after every 1，000 seconds.CUndo data will be stored permanently after 1，000 seconds.DCommitted undo data would be retained for 1，000 seconds if free undo space is available.EUndo data will be retained in the UNDO tablespace for 1，000 seconds，then it gets moved to the TEMPORARY tablespace to provide read consistency.
多选题You require the Oracle server to manage the undo segments and space among various active sessions automatically. You created an undo tablespace， UNDO_TBS1， in your database. Which two additional steps would you perform to achieve this？（）ASet the UNDO_RETENTION parameter to 900 or more.BCreate an initial undo segment in the undo tablespace.CEnable the retention guarantee for the undo tablespace.DSet the UNDO_TABLESPACE parameter to UNDO_TBS1.ESet the UNDO_MANAGEMENT initialization parameter to AUTO.
单选题You are maintaining your database in Oracle10g. You set the value of the UNDO_RETENTION initialization parameter to zero in the initialization parameter file. What will be the impact of specifying this setting？（）A The database will not start.B The database will start but will not retain the undo data in the undo segment.C The database will start， and the undo segment will contain the undo data for at least one hour.D The database will start， and the undo segment will retain the undo data for at least 15 minutes.
单选题You work as a database administrator for Certkiller .com. The UNDO_RETENTION parameter in your database is set to 1000 and undoretention is not guaranteed. Which statement regarding retention of undo data is correct？（）AUndo data becomes obsolete after 1，000 seconds.BUndo data gets refreshed after 1，000 seconds.CUndo data will be stored permanently after 1，000 seconds.DCommitted undo data would be retained for 1，000 seconds if free undo space is available.EUndo data will be retained in the UNDOtablespacefor 1，000 seconds， then it gets movedmovedto the TEMPORARYtablespaceto provide read consistency.
多选题Which three pieces of information are considered while deciding the size of the undo tablespace in your database？（）Athe size of an undo blockBthe size of the redo log filesCundo blocks generated per secondDthe size of the database buffer cacheEthe value of the UNDO_RETENTION parameter