A.roll back of large transactionsB.roll forward to redo……

单项选择题The database users are connecting to the PROD database from different  applications， thereby degrading the database performance. The senior database administrator suspects the large number of concurrent connections to be the reason for low performance and asks you to restrict the number concurrent connections per database user to one.  Which action would you take to achieve this objective？（）

A.set the SESSIONS to 1 in the parameter file
B.grant SINGLE SESSION privilege to all of the users
C.set the SESSIONS_PER_USER to 1 in the users’ profile
D.grant RESTRICTED SESSION privilege to all of the database users
E.create a role with SINGLE SESSION privilege and assign the role to the users

单项选择题You are using flat files as the data source for one of your data warehousing applications. You plan to move the data from the flat file structures to an Oracle database to optimize the application performance. In your database you have clustered tables.  While migrating the data， you want to have minimal impact on the database performance and optimize the data load operation. Which method would you use to load data into Oracle database？（）

A.use the external table population
B.use the Oracle Data Pump export and import utility
C.use the conventional path data load of SQL*Loader utility
D.use the direct path data load of Oracle export and import utility

单项选择题Wheredoyoufindinformationaboutamissingredologfile？（）

A.trace file
B.audit trail
C.control file
D.alert log file
E.event viewer

单项选择题YourdatabaseisintheNOARCHIVELOGmode.Sincelastnight’sofflinebackup，thelogsingroup1havebeenwrittentotwice.Thismorning，theSYSTEMdatafilehasbecomecorrupted.Uptowhatpointcanitberecovered？（）

A.until the last commit
B.cannot be recovered
C.until the last offline backup
D.until the beginning of the last transaction

单项选择题Youhavetwodatabases，FINDBandPAYDB，onsingleoperatingsystemandusingOptimalFlexiblearchitecture（OFA）.FINDBisfunctionalandiscurrentlybeingaccessedbytheusers.WhilestartinguptheinstanceforthePAYDBdatabaseyougetthefollowingerror：ORA-01081：cannotstart-alreadyrunningORACLE-shutitdownfirstWhichenvironmentalvariablewouldyousetbeforestartingupthePAYDBdatabasetoovercomethiserror？（）

A.ORA_PATH
B.ORACLE_SID
C.ORACLE_BASE
D.ORACLE_HOME
E.LD_LIBRARY_PATH