You discover an out-of-space condition in the database. You decide to suspend a session for five minutes. You issue the following command to suspend the session：  
ALTER SESSION ENABLE RESUMABLE；  
Which command could you issue to enable the resumable space allocation feature at the session level？（）  

单项选择题YouareusingOracleEnterpriseManagertoestimatethesizeofatabletobecreated.Youhavetypeddataregardingthecolumnnames，datatypes，sizesofthecolumns，andtheprojectednumberofrowsinthetable.WhichadditionalinformationdoestheOracleEnterpriseManagerreturn？（）

A. space allocated in the tablespace
B. space required for the bitmap index on a column of the table
C. space remaining in the tablespace after creating the table
D. estimated value of the PCTFREE storage parameter

单项选择题You created the DEPT table by using the following command：   CREATE TABLE scott.dept   （deptno NUMBER（3），   dname VARCHAR2（15），   loc VARCHAR2（15） ）   STORAGE （INITIAL 100K NEXT 50K  MAXEXTENTS 10 PCTINCREASE 5  FREELIST GROUPS 6 FREELISTS 4）；You are required to shrink the DEPT table. While performing the shrink operation， you want to ensure that the recovered space is returned to the tablespace in which the DEPT table is stored. You do not want to shrink the indexes created on the DEPT table. What will you do to shrink the SCOTT.EMP table？（）

A. Issue the ALTER TABLE SCOTT.DEPT SHRINK SPACE COMPACT； statement.
B. Issue the ALTER TABLE SCOTT.DEPT SHRINK SPACE； statement.
C. Issue the ALTER TABLE SCOTT.DEPT SHRINK SPACE CASCADE； statement.
D. You cannot shrink the SCOTT.EMP table.

单项选择题This is the online redo log files and the control file configurations： Based on these configurations， which statement is true？（）

A. Both the control files and the online redo log files are configured properly.
B. The control files are configured properly， but the online redo log files are not configured properly.
C. The online redo log files are configured properly， but the control files are not configured properly.
D. Neither the control files nor the online redo log files are configured properly.

单项选择题YouaremaintainingyourOLTPdatabaseinOracle10g.Whileobservingtheperformanceofthedatabase，youfindthatthelogswitchoccursmorethanonceforevery20minutes，affectingthedatabaseperformance.Whichfactorisresponsibleforfrequentlogswitches？（）

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

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