数据库维护应包括()增加、删除、拷贝、修改数据库参数等操作。
A. 单点
B. 批量
C. 单点及批量
D. 重复
用户可以在工作表视图添加跟踪域,以跟踪项目计划的进行情况。()
A. 正确
B. 错误
对电动操作的电气设备,所有转动机械的电气回路应通过检查、试验,确认控制、保护、测量、()回路无误后方可启动。
A. 分闸
B. 合闸
C. 信号
D. 闭锁
You issue the following statement: SQL> SELECT FIRSTNAME, LASTNAME FROM HR.EMPLOYEE; You receive the following error: 01578: ORACLE data block corrupted (file# 6, block # 54) ORA-01110 : data file 6: ’u01/oracle/oradata/data1.dbf’ How will you resolve this problem of data block corruption by reducing the mean time to recover (MTTR)?()
A. by using the DBMS_REPAIR package
B. by using the DBVERIFY utility
C. by using Block Media Recovery
D. by issuing the ANALYZE TABLE HEMPLOYEES VALIDATE STRUCTURE command