前面介绍了Oracle的基本参数，从这节开始讲其他的参数，参数从v$parameter中提取
基本参数请看如下链接:
[http://www.zhaibibei.cn/oralce/oracle-parameter/](http://www.zhaibibei.cn/oralce/oracle-parameter/)
如无特殊说明数据库版本为11.2
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**db_ultra_safe**
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1. 参数类型:字符串
2. 默认值:OFF
3. 语法: DB_ULTRA_SAFE = { OFF | DATA_ONLY | DATA_AND_INDEX }
4. 修改:修改需要 重启数据库
6. 基本参数:否
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**取值意义**
该参数设定其他控制保护级别参数的默认值
**OFF**
- 如果DB_BLOCK_CHECKING, DB_BLOCK_CHECKSUM, 或 DB_LOST_WRITE_PROTECT已经指定了，则没有改变
**DATA_ONLY**
- DB_BLOCK_CHECKING will be set to MEDIUM.
- DB_LOST_WRITE_PROTECT will be set to TYPICAL.
- DB_BLOCK_CHECKSUM will be set to FULL.
**DATA_AND_INDEX**
- DB_BLOCK_CHECKING will be set to FULL.
- DB_LOST_WRITE_PROTECT will be set to TYPICAL.
- DB_BLOCK_CHECKSUM will be set to FULL.
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**更多内容**
[db_block_checksum](http://www.zhaibibei.cn/oralce/oracle-parameter/db_block_checksum/)
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**实际截图：**
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**参考连接**
[https://docs.oracle.com/cd/E18283_01/server.112/e17110/initparams067.htm](https://docs.oracle.com/cd/E18283_01/server.112/e17110/initparams067.htm)
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下期参数
**db_cache_size**