单选题When determining the number of UNDO segments in a database, which of the following choices identifies a factor to consider? （）ASize of typical transactions BConcurrent transactions CSize of rows in table most frequently changed DNumber of anticipated disk sorts
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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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.
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
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.
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？（）AIncrease the undo returnBCreate more undo segmentsCCreate another undotablespaceDIncrease the size of the undo tablespace
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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? （）ASize of typical transactions BConcurrent transactions CSize of rows in table most frequently changed DNumber of anticipated disk sorts
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.
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？（）A3 hoursB6 monthsCuntil last yearDuntil last commitEuntil the point when the undotablespacewas refreshedFuntil the database is shut down and the memory erased
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
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