一個SQL超時可能的緣由 :) a reason why sql timeout expired

　有時候，咱們發現工做流或插件裏面的錯誤信息提示SQL 超時了，trace 日誌裏面能夠找到 System.Data.SqlClient.SqlException Timeout Expired 這樣的錯誤

some times we found that sql timeout occured in the log of workflow or plugin , we can found the key words 'timeout expired' in the trace log.

緣由是什麼呢，真的很難找到哈，在前端的trace日誌裏面你可能會發現不少 ImportXml.RunImport()這樣的消息，實際上是有人在導入解決方案所致。

what's the reason ,it's hard to find, this time we probably find that a lot of message about ImportXml.RunImport, In fact ,some one is importing solution package at that time.

hope this help!