一根钢筋混凝土偏心受拉构件，截面尺寸b×h=250mm×400mm，截面承受的纵向拉力N=550kN，弯矩M=60kN·m，混凝土强度

E POINT TESTDB06; 以下说明正确的是()。

A、数据库备份将在1天后删除，而不管默认保留策略设置

B、数据库备份的过程中，只有数据库是open状态才会备份归档

C、备份将在1天后过期，而不管默认保留策略设置

D、只有数据文件和控制文件进行备份

A.RESTORE DATABASE UNTIL

B.RECOVER DATABASE UNTIL

C.RECOVER DATA UNTIL

D.RESTORE DATA UNTIL

恢复数据，可以在查询分析器中使用这样的命令： BACKUP DATABASE database_name FROM backup ()

A．RESTORE DATABASE UNTIL

B．RECOVER DATABASE UNTIL

C．RECOVER DATA UNTIL

D．RESTORE DATA UNTIL

A. The KEEP option overrides the configured retention policy

B. The KEEP option is an attribute of an individual backup piece

C. The backup contains only data files and archived redo log files

D. The backup contains data files, the server parameter file and the control file even if the control file auto backup is disabled

EVER option. After some days, you want to change the status of the database backup and you issued the following command:RMAN>CHANGE BACKUPSET 231 NOKEEP;What is the implication of this command？（）

A. The backup is deleted.

B. The backup is marked unavailable.

C. The backup overrides the backup retention policy.

D. the backup becomes eligible for deletion according to the existing retention policy

A、Create DataBase

B、Drop DataBase

C、Backup DataBase

D、Restore DataBase

A．use database test;

B．use testdb;

C．use test;

D．select test;