The tnsnames.ora file has an entry for the service alias ORCL as follows:The TNS ping command executes successfully when tested with ORCL; however, from the same OS usersession, 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?（） The listener is not running on the database node.。 The TNS_ADMIN environment variable is set to the wrong value.。 The orcl.oracle.com database service is not registered with the listener.。 The DEFAULT_DOMAIN parameter is set to the wrong value in the sqlnet.ora file.。 The listener is running on a different port.。
You work as a database administrator at Certkiller .com. In your production database there is a job， CALC_STAT， which has been scheduled to run every Friday at 5.00 p.m. CALC_STATupdates the optimizer statistics for the objects owned by the APPSschema. You want the task to be generic， thereby allowing users to modify the attributes of the task at run time without affecting the original task.Which component of Oracle Scheduler must you define to achieve this？（） Window。 Program。 Job class。 Window grou。
密封的V型圈数量取决于密封（）的大小。 压力。 压强。 温度。 管口。
器的直径（）爆炸上、下限的差距也越小，发生爆炸的危险性降低 越小。 越大。
材料本身的性质（包括两种对摩的材料）
避雷带应每隔（）m设置一支撑杆，支撑杆露出墙面部分的高度应不小于15cm，插入墙内的深度不小于10cm，插入支撑杆前先将钻孔时产生的粉末清理干净后，再将支撑杆一端涂上沥青，并且支撑杆应尽量保持在同一直线上。
