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单选题
When determining the number of UNDO segments in a database, which of the following choices identifies a factor to consider? （）
A
Size of typical transactions
B
Concurrent transactions
C
Size of rows in table most frequently changed
D
Number of anticipated disk sorts
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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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Your database instance is running with full workload after database creation. You have decided to useafixed-sizeundo tablespace. You want to use the Undo Advisor to estimate the capacity of the undotablespace. Which two factors must you consider before using the Undo Advisor to estimate the capacity of the undotablespace（）A、the retention period to support flashbackB、the expected length of the longest-running queryC、the number of undo tablespaces in the databaseD、the size of the Flash Recovery Area for the database instance
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Which two statements are true regarding undo tablespaces（）A、The database can have more than one undo tablespace.B、The UNDO_TABLESPACE parameter is valid in both automatic andmanualundo management.C、Undo segments automatically grow and shrink as needed， acting as circular storage buffer for their assigned transactions.D、An undotablespaceis automatically created if the UNDO_TABLESPACEparameter is not set and the UNDO_MANAGEMENT parameter is set to AUTO during the database instance start up.
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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.
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Your database instance is running with full workload after database creation. You have decided to use a fixed-size undo tablespace. You want to use the Undo Advisor to estimate the capacity of the undo tablespace. Which two factors must you consider before using the Undo Advisor to estimate the capacity of the undotablespace（）A、The retention period to support flashbackB、The expected length of the longest-running queryC、The number of undo tablespaces in the databaseD、The size of the Flash Recovery Area for the database instance
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Which two statements are true regarding transactions in an Oracle database（）A、Multiple transactions can use the same undo segment.B、A transaction is assigned an undo segment when it is started.C、More than one transaction cannot share the same extent in the undo tablespace.D、The transactions use system undo segment to store undo data if all the segments in the undo tablespaceare used.
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Which three statements are true about database recovery operations？（）A、Damaged or lost data files are restored from backups.B、Redo log file entries are used to roll forward the database.C、Undo segments are used to roll back any uncommitted transactions.D、Transactions that were active when the failure occurred are restarted.E、Transactions that were active when the failure occurred are automatically committed during the recover procedure.
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You executed the following query： SELECT operation， undo_sql， table_name FROM flashback_transaction_query； Which statement is correct regarding the query output？（） A、It would return information regarding only the last committed transaction.B、It would return only the active transactions in all the undo segments in the database.C、It would return only the committed transactions in all the undo segments in the database.D、It would return both active and committed transactions in all the undo segments in the database.E、It would return information regarding the transactions that began and were committed in the last 30 minutes.
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单选题Users in your PROD database complain about the slow response of the transactions. While investigating the reason， you find that the transactions are waiting for the undo segments to be available， and undo retention has been set to zero. What would you do to overcome this problem？（）A
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单选题You work as a database administrator for Supportcenter.cn. Users in the Supportcenter.cn PROD database complain about the slow response of transactions. While investigating the reason you find that the transactions are waiting for the undo segments to be available， and undo retention has been set to zero. What would you do to overcome this problem？（）A
Increase the undo returnB
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多选题Your database instance is running with full workload after database creation. You have decided to useafixed-sizeundo tablespace. You want to use the Undo Advisor to estimate the capacity of the undotablespace. Which two factors must you consider before using the Undo Advisor to estimate the capacity of the undotablespace（）Athe retention period to support flashbackBthe expected length of the longest-running queryCthe number of undo tablespaces in the databaseDthe size of the Flash Recovery Area for the database instance
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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.
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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.
考题
单选题When determining the number of UNDO segments in a database, which of the following choices identifies a factor to consider? （）A
Size of typical transactions B
Concurrent transactions C
Size of rows in table most frequently changed D
Number of anticipated disk sorts
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多选题Which two statements are true regarding undo tablespaces（）AThe database can have more than one undo tablespace.BThe UNDO_TABLESPACE parameter is valid in both automatic andmanualundo management.CUndo segments automatically grow and shrink as needed， acting as circular storage buffer for their assigned transactions.DAn undotablespaceis automatically created if the UNDO_TABLESPACEparameter is not set and the UNDO_MANAGEMENT parameter is set to AUTO during the database instance start up.
考题
单选题You work as a database administrator for Supportcenter.cn. Your database is configured for automatic undo management. UNDO_RETENTION is set to 3 hours. You want to flash back a table that was created last year. How far back can the flashback query go？（）A
3 hoursB
6 monthsC
until last yearD
until last commitE
until the point when the undotablespacewas refreshedF
until the database is shut down and the memory erased
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多选题Your database instance is running with full workload after database creation. You have decided to use a fixed-size undo tablespace. You want to use the Undo Advisor to estimate the capacity of the undo tablespace. Which two factors must you consider before using the Undo Advisor to estimate the capacity of the undotablespace（）AThe retention period to support flashbackBThe expected length of the longest-running queryCThe number of undo tablespaces in the databaseDThe size of the Flash Recovery Area for the database instance
考题
单选题You executed the following query： SELECT operation， undo_sql， table_name FROM flashback_transaction_query； Which statement is correct regarding the query output？（）A
It would return information regarding only the last committed transaction.B
It would return only the active transactions in all the undo segments in the database.C
It would return only the committed transactions in all the undo segments in the database.D
It would return both active and committed transactions in all the undo segments in the database.E
It would return information regarding the transactions that began and were committed in the last 30 minutes.
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