如果您想在系统提供的备用存储器之外保存和恢复首选项，您可以在xml格式的文档中执行这些操作。
If you want to save and restore preferences outside of the system-provided backing storage, you can do so in an XML-formatted document.
Synchronous(同步)(零数据丢失)-主服务器进行提交之前，要先将日志数据写入备用服务器中的稳定存储器。
Synchronous (zero data loss) - the log data is flushed to stable storage at the standby before committing on the primary.
应用推荐