Your database operates in ARCHIVELOG mode. User-managed consistent backups are performed every Sunday night. On Tuesday， client A drops a table at 8：00 a.m. as follows： SQL> DROP TABLE cust_ord PURGE； Table dropped. Client B executes a query at 9：00 a.m. on the same table as follows： SQL> SELECT * FROM cust_ord； SELECT * FROM cust_ord *ERROR at line 1：ORA-00942： table or view does not exist Client B needs the dropped table and reports the problem to you.With reference to this scenario， which action should you take？（） retrieve the table by using the flashback feature。 restore all the data files from last Sunday’s backup and then perform a time-based recovery。 restore all the data files from last Sunday’s backup and then perform a log sequence recovery。 restore all the data files from last Sunday’s backup and then perform a cancel-based recovery。 restore from last Sunday’s backup only data files that belong to the tablespace in which the table was stored and then perform a complete recovery。
可以使用GetChildRows方法检索指定主表记录的所有子表相关记录。
室内机背部靠墙，需做好防震加固，室内机安装应考虑（） 美观。 整洁。 隐秘。 利于冷凝水的排放。
Your boss at Certkiller .com wants you to clarify Oracle 10g. Which condition in your database forces you to perform only consistent backups？（） The database is in mount state.。 One of the tablespaces is offline.。 One of the tablespaces is read only.。 The database operates in ARCHIEVELOG mode.。 The database operates in NOARCHIEVELOG mode.。
用直流电桥测量变压器绕组的直流电阻的充电过程中，电桥测量变压器绕组值随时间的增加而（）。 增加。 不变。 减小。
液化气装车和轻油装车时必须（）
