红帽全球峰会A.9.6. Oracle::Data Dictionary Cache
Oracle::Data Dictionary Cache 探测计算数据字典缓存点中率（Data Dictionary Cache Hit Ratio）优化
init.ora 中的 SHARED_POOL_SIZE。它收集以下的数据：
- 数据字典点中率 - 在数据字典缓存中找到需要的数据的比率。换句话说，数据库从字典中获得数据而不是从硬盘中获得数据的比率。如果这个比率较低，则要添加更多的 RAM。
- Gets - 经过单独的块 gets（而不是通过 consistent get 方法）存取的块数。
- 缺失的缓存 - 块缓冲区从 consistent 模式中获得数据的访问数量。
| 字段 | 值 |
|---|---|
| Oracle SID* | |
| Oracle 用户名* | |
| Oracle 密码* | |
| Oracle 端口* | 1521 |
| 超时* | 30 |
| 最小数据字典缓存点中率的 warning 阈值 | |
| 最小数据字典缓存点中率的 critical 阈值 |
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