多项选择题 When you try to start the Database Control by using the emctl start dbconsole command the following error is displayed：  TZ set to America/New_york  OC4J Configuration issue.  /u01/app/oracle/product/10.1.0/db_1/oc4j/j2ee/OC4J_DBConsole_orcl.us.oracle.com not found.  Which two environment variables do you need to set appropriately to avoid such errors and start the Database Control successfully？（）

单项选择题 TheSCOTTuserhasanindexontheITEM_DESCcolumnoftheITEMtable.Aspartoftheyear-endingtask，SCOTTupdatestheITEM_DESCcolumnformostoftherowsintheITEMtable.Howdoesthischangetothetableaffecttheindex？（）

单项选择题 Your tnsnames.ora file has the following entry for the service alias ORCL：  ORCL =  （DESCRIPTION =  （ADDRESS = （PROTOCOL = TCP） （HOST = 10.156.24.216） （PORT = 1521））   （CONNECT_DATA =  （SERVER = DEDICATED） （SERVICE_NAME = orcl.oracle.com）   ）   ）   The TNSPING command executes successfully when tested with ORCL but you are not able to connect to the database instance with the following command：  SQL> CONNECT scott/tiger@orcl  What could be the reason for this？（）