1z0-043單項(xiàng)選擇題每日一練(2019.01.21)

You issued the following statement to monitor the usage of the index：      
 SQL> ALTER INDEX SCOTT.EMP_IDX MONITORING USAGE；  
Which view will you query to ensure that the index is being monitored？（）  

You are maintaining the database of a company. The listener process， listener1， is configured for remote access. You have issued the following command：  
LSNRCTL>STATUS listener1  
Which information will NOT be displayed when you issue the above command？（） 

You are using Oracle Database 10g. The LOG_ARCHIVE_FORMAT parameter is set to 
’LOG%t_%s_%r.dbf’. 
Why is %r used in the file name format？（）