索引相关资料备份

https://www.cnblogs.com/xishuai/p/sql-server-clustered-index-order-by.html
https://stackoverflow.com/questions/11826441/how-to-reduce-clustered-index-scan-cost-by-using-sql-query
https://stackoverflow.com/questions/3639085/sql-primary-key-sort-order
https://docs.microsoft.com/en-us/previous-versions/sql/sql-server-2008-r2/ms181154(v=sql.105)
http://www.itpub.net/thread-1014684-1-1.html
https://bbs.csdn.net/topics/310261875