ORA-26828: XStream outbound server “string” requires combined capture and apply mode.
Cause: The specified XStream outbound server was not in combined capture and apply mode.
Action: Restore the combined capture and apply mode and then restart the capture.
ORA-26828异常指，XStream Outbound Server字符串要求采用 Combined Capture and Apply 模式，但当前的模式不是 Combined Capture and Apply 模式。
Oracle官方的解释是：当XStream Outbound Server字符串的模式不是 Combined Capture and Apply 时，就会抛出ORA-26828异常。
（1）确保XStream Outbound Server字符串的模式为Combined Capture and Apply模式
（2）重新启动XStream Outbound Server字符串并确保其正常运行
（3）检查是否有XStream Outbound Server表关联，如果没有，将XStream Outbound Server表链接到用户表中
（4）修改环境变量上的XStream特定设置，进而修改XStream Outbound Server表的设置
（5）应用转换，运行XStream Outbound Server字符串
（6）检查XStream Outbound Server日志文件，查看是否有其它异常发生