问题
Question is in the title. I'd just love to understand why this isn't supported?
Just to clarify this is MS Sql Server 2005 / 2008.
回答1:
Because it's potentially inconsistent and it's weaker out of the box than lock-based isolation (ANSI SQL).
Or, the downsides (such as this banking example) require more work and thinking to keep things correct so it's simply safer not to support it.
Finally (I've not checked), is it in the ANSI standard? It could be a very bespoke solution and you'd be unable to use distributed transactions against other platforms
Link 1
来源：https://stackoverflow.com/questions/1331734/why-isnt-snapshot-isolation-supported-with-distributed-transactions-in-sql-serv