使用 RMAN 工具实现 Oracle 数据库服务器的备份和恢复。

备份方式：

1. 创建备份集：

run { ALLOCATE CHANNEL ch1 TYPE DISK; ALLOCATE CHANNEL ch2 TYPE DISK; BACKUP AS BACKUPSET DATABASE; RELEASE CHANNEL ch1; RELEASE CHANNEL ch2; }

2. 备份数据文件和日志：

run { ALLOCATE CHANNEL ch1 TYPE DISK; BACKUP AS BACKUPSET ARCHIVELOG ALL DELETE INPUT; RELEASE CHANNEL ch1; }

恢复方式：

1. 找到 SCN：

SELECT NAME, FIRST_TIME, NEXT_TIME FROM V$ARCHIVED_LOG WHERE COMPLETED = 'YES' ORDER BY NEXT_TIME DESC;

2. 选择 SCN 点恢复：

run { ALLOCATE CHANNEL ch1 TYPE DISK; SET UNTIL SCN 123456789; RESTORE DATABASE; RECOVER DATABASE; RELEASE CHANNEL ch1; }

其中 SCN 是根据上一步中查找到的时间确定的。