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+## 查看归档日志使用情况
+```sql
+sqlplus / as sysdba
+select * from v$recovery_file_dest;
+select * from V$FLASH_RECOVERY_AREA_USAGE;
+```
+## 查询日志目录位置
+```sql
+show parameter recover;
+```
+## 计算fast_recovery_area已经占用的空间
+```sql
+select sum(percent_space_used)*3/100 from v$flash_recovery_area_usage;
+```
+## 修改fast_recovery_aread的空间
+```sql
+ALTER SYSTEM SET DB_RECOVERY_FILE_DEST_SIZE=8g;
+```
+
+## rman清理日志
+```sql
+rman target /
+```
+## 删除过期归档日志
+```sql
+crosscheck archivelog all;
+delete expired archivelog all;
+```
+## 删除昨天以前的归档日志
+```sql
+delete noprompt archivelog until time  'sysdate-1';
+```
+
+# 其他
+## 显示rman配置
+```sql
+show all;
+```
+## 报告目标数据库的物理结构
+```sql
+report schema;
+```
+## 报告陈旧备份
+```sql
+report obsolete;
+```
+## 报告不可恢复的数据文件
+```sql
+report unrecoverable;
+```
+## 列出备份信息
+```sql
+list backup;
+list backup of database;
+list backup of tablespace table_name;
+list backup of controlfile;
+list backup of spfile;
+list backupset id;
+```
+## 校验备份
+```sql
+crosscheck backup;
+crosscheck backup of database;
+crosscheck backup of tablespace system;
+crosscheck backup of controlfile;
+crosscheck backup of spfile;
+crosscheck backup of archivelog all;
+```
+## 校验没有备份过的归档日志
+```sql
+crosscheck archivelog all;
+delete noprompt expired archivelog all;
+```
+## 刪除所有的Archivelog files
+```sql
+delete archivelog all;　
+```
+## 強制刪除昨天以前的archivelog files
+```sql
+delete force archivelog until time 'sysdate -1';
+delete noprompt  force archivelog until time 'sysdate -2';
+```
+## 刪除所有过期的Archivelog files
+```sql
+delete expired archivelog all;
+```
+##  删除陈旧备份
+```sql
+delete obsolete;
+delete noprompt obsolete;
+```
+## 删除所有expired的备份（包括归档日志、控制文件、备份聚）
+```sql
+delete expired backup;
+```
+## 删除所有备份
+```sql
+delete backup;
+```
+## 改为长期备份
+```sql
+change backupset id unavailable;
+change backupset id keep forever logs;
+change backupset id keep until time 'sysdate+30' logs;
+change backupset id nokeep;
+```
+## 改为基于时间的备份
+```sql
+configure retention policy to recovery window of 30 days;
+```
+## 改为基于冗余数量的备份
+```sql
+configure retention policy to redundancy  n ;
+```
+## 取消备份保留策略
+```sql
+configure retention policy to none;
+```
+## 设置归档日志存放在其它位置
+```sql
+set archivelog destination to 'e: emp';
+```
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