在我们的日常工作中，会经常遇到不同版本oracle的client和server之间的连接。在metalink上有一个文档提供了当前各版本间的可连通性列表，文档ID：207303.1 文档名：Client / Server / Interoperability Support Between Different Oracle Versions
| Server Version |
| Client Version | 10.2.0 | 10.1.0 | 9.2.0 | 9.0.1 | 8.1.7 | 8.1.6 | 8.1.5 | 8.0.6 | 8.0.5 | 7.3.4 |
| 10.2.0 | Yes | Yes | Yes | No | Was | No | No | No | No | No |
| 10.1.0 | Yes | Yes | Yes | Was | Was | No | No | No | No | No |
| 9.2.0 | Yes | Yes | Yes | Was | Was | No | No | Was | No | No |
| 9.0.1 | No | Was | Was | Was | Was | Was | No | Was | No | Was |
| 8.1.7 | Was | Was | Was | Was | Was | Was | Was | Was | Was | Was |
| 8.1.6 | No | No | No | Was | Was | Was | Was | Was | Was | Was |
| 8.1.5 | No | No | No | No | Was | Was | Was | Was | Was | Was |
| 8.0.6 | No | No | Was | Was | Was | Was | Was | Was | Was | Was |
| 8.0.5 | No | No | No | No | Was | Was | Was | Was | Was | Was |
| 7.3.4 | No | No | Was | Was | Was | Was | Was | Was | Was | Was |
| Yes | Supported |
| EMS | Supported for customers under Extended Maintenance (EMS) only. |
| Was | Was a supported combination but one of the releases is no longer covered by any of Premier Support , Primary Error Correct support or Extended Maintenance Support so fixes are no longer possible. |
| No | Has never been Supported |