单项选择题
You are maintaining your OLTP database in Oracle10g. While observing the performance of the database， you find that the log switch occurs more than once for every 20 minutes， affecting the database performance. Which factor is responsible for frequent log switches？（）
A.the value of the UNDO_RETENTION initialization parameter
B.the value of the optimal redo log file size provided by the Redo Logfile Size Advisor
C.the online redo log files size
D.the number of redo log members in a group
相关考题
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单项选择题
YouaremaintainingyourdatabaseinOracle10g.YouhavesetthevalueoftheSTATISTICS_LEVELinitializationparametertoTYPICALandthevalueoftheFAST_START_MTTR_TARGETparameterto900seconds.Toincreasetheperformanceofthedatabase，youwanttodeterminetheoptimalsizeoftheonlineredologfiles.Whichtoolenablesyoutodeterminetheoptimalsizeoftheonlineredologfiles？（）
A. Oracle Enterprise Manager
B. The V$LOG view
C. The V$LOGFILE view
D. The V$FLASHBACK_DATABASE_LOGS view -
单项选择题
Inwhichscenariowillyoucreateasortedhashcluster？（）
A. if the application uses queries joining tables only occasionally
B. if the full table scan is executed often on only one table of the clustered tables
C. if the data for all the rows of a cluster key value exceeds one or two Oracle blocks
D. when you want the data to be returned automatically in the chronological order -
单项选择题
You moved the index EMP_NO_INDX from one tablespace to another and then issued the following command to rebuild the index EMP_NO_INDX： SQL> ALTER INDEX EMP_NO_INDX REBUILD ONLINE； Which table allows the users to access the EMP_NO_INDX index while performing the rebuild operation？（）
A. Index-organized table
B. Mapping Table
C. Clustered Table
D. Journal Table
