You executed the following command to perform a backup of the USERS tablespace： SQL> ALTER TABLESPACE users BEGIN BACKUP； ALTER TABLESPACE users BEGIN BACKUP * ERROR at line 1： ORA-01123： cannot start online backup； media recovery not enabled What could be the reason for this error（） The MTTR Advisor is disabled.。 The database is in NOARCHIVELOG mode.。 The tablespace is already in backup mode.。 The Flash Recovery Area is not configured.。
在“食堂”角色游戏中，教师当食品卫生检查员，来到食堂检查卫生，指出了食堂的杂乱现象，扮演食堂服务员的儿童接受了意见，搞起了卫生。这种游戏指导方式称为（） 平行游戏指导。 共同游戏指导。 旁观者指导。 非言语指导。
The following are the details of your database：Instance name：test Host name ： tech1.us.oracle.com IP address：145.33.230.186 Enterprise Manager Console HTTP Port number：5500 You started the database instance and you want to manage your database remotely with Enterprise Manager through a Web browser. Which two URLs would you use to access the Database Control？（） http：//145.33.230.186：5500/em。 http：//www.145.33.230.186：5500/em。 http：//tech1.us.oracle.com：5500/em。 http：//test.145.33.230.186：5500/em。 http：//test.tech1.us.oracle.com：5500。 http：//www.tech1.us.oracle.com：5500/em。 http：//test.tech1.us.oracle.com：5500/em。
Examine the structures of the EMPLOYEES and TAX tables. EMPLOYEES EMPLOYEE_ID NUMBER NOT NULL, Primary Key EMP_NAME VARCHAR2 (30) JOB_ID VARCHAR2 (20) SALARY NUMBER References MGR_ID NUMBER EMPLOYEE_ID column DEPARTMENT_ID NUMBER Foreign key to DEPARTMENT _ID column of the DEPARTMENT table TAX MIN_SALARY NUMBER MAX_SALARY NUMBER TAX_PERCENT NUMBER Percentage tax for given salary range You need to find the percentage tax applicable for each employee. Which SQL statement would you use?（） SELECT employee_id, salary, tax_percent FROM employees e, tax t WHERE e.salary BETWEEN t.min _ salary AND t.max_salary。 SELECT employee_id, salary, tax_percent FROM employees e, tax t WHERE e.salary > t.min_salary, tax_percent。 SELECT employee_id, salary, tax_percent FROM employees e, tax t WHERE MIN(e.salary) = t.min_salary AND MAX(e.salary) = t.max_salary。 You cannot find the information because there is no common column between the two tables.。
垂直绿化类特点
Very soon you will be performing maintenance operations. You would have several jobs to run as soon as the maintenance period starts. Which method would you use to create jobs without specifying the time period when the job should be run？（）
