Hi budy,

there is no size issue if you are using MDX directlly but if you are executing mdx using store procedure than there is some limitation like(MDX should not be greater than 8000 char).

So if your quey is more than 8000 char you need to create a clr function which take your MDX and connection string (to connect SSAS cube) as a parameter using ADO.NET. Using CLR there is no limitation of query size...

Thanks

Binayak