SQL Server購買授權說明

很詳細的說明，正式環境如果不確定有幾個使用者，就買Core授權 https://rainmakerho.github.io/2017/09/27/sql2016license/ 

 測試和開發環境
(1) 購買MSDN Visual Studio Professional標準訂閱，使用SQL Server Standard/Enterprise版本建置測試/開發環境
https://visualstudio.microsoft.com/zh-hant/vs/pricing/

 (2) 使用免費的SQL Server Developer Edition建置測試/開發環境 如果需要建置AlwaysOn，Developer Edition應該也可以建AlwaysOn
https://social.msdn.microsoft.com/Forums/sqlserver/en-US/3531809a-8539-4b9b-96ad-fae96155dff9/setting-alwayson-in-developer-edition?forum=sqldisasterrecovery

SQL Server 2012：在AlwaysOn可用性群組上，請勿使用Windows容錯移轉管理員來執行容錯移轉

http://sharedderrick.blogspot.tw/2012/06/sql-server-2012alwaysonwindows.html

容錯移轉管理員Failover Cluster Manager

List of Cluster Hotfixes for Windows Server 2008 R2

http://social.technet.microsoft.com/wiki/contents/articles/2008.list-of-cluster-hotfixes-for-windows-server-2008-r2.aspx
•2687741 — A hotfix that improves the performance of the "AlwaysOn Availability Group" feature in SQL Server 2012 is available for Windows Server 2008 R2