单项选择题
The user SCOTT executes the following command successfully to increase the salary values in one of his sessions：
SQL> UPDATE emp SET sal=sal*1.15 WHERE deptno=20；
Before SCOTT ends the transaction， user HR who has the privileges on EMP table executes a query to fetch the salary details but finds the old salary values instead of the increased values. Why does HR still see the old data？（）
A.because of redo data from redo log file
B.because of data from database buffer cache
C.because of data from a temporary tablespace
D.because of undo data from the undo tablespace
相关考题
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单项选择题
Your database is started by using the server parameter file （SPFILE）. You issued this command to change the value of the LOG_BUFFER initialization parameter： ALTER SYSTEM SET LOG_BUFFER=24M SCOPE=BOTH； What would be the outcome of this command？ （）
A.The command would return an error because LOG_BUFFER is a static parameter.
B.The parameter value would be changed and it would come into effect immediately.
C.You need to restart the database so that parameter changes can come into effect.
D.The command would succeed only if initialization parameter LOG_ARCHIVE_MAX_PROCESS is set to value 2. -
单项选择题
YouworkasadatabaseadministratorforSupportcenter.cn.Youdeterminethatarchivingwasnotsuccessfulinoneofthedestinators.Youwanttocheckthealertlogfileformoreinformationonthis.Whichinitializationparametergivesyouthelocationofthealertlogfile？（）
A.USER_DUMP_DEST
B.CORE_DUMP_DEST
C.ALERT_LOG_DEST
D.ALERT_DUMP_DEST
E.TRACE_DUMP_DEST
F.BACKGROUND_DUMP_DEST -
单项选择题
You executed the following command to back up your control file： ALTER DATABASE BACKUP CONTROLFILE TO TRACE； Which initialization parameter is used to specify the location of the trace file？（）
A.USER_DUMP_DEST
B.CORE_DUMP_DEST
C.TRACE_DUMP_DEST
D.BACKUP_DUMP_DEST
E.BACKGROUND_DUMP_DEST
