I was trying to find a tool to increase performance in the reports of our application and I heard about OLAP + Reporting Services which is described as an excellent combination to do this work. Anyway I didn't find the way to keep the OLAP cube up-to-date since the data in the original DB can change. (It's a transactional application and one pending record can be mark as paid etc).
Is this the better way to do this, or should I use another technology?
If the suggestion is still to use OLAP + Reporting services how can I have the information up-to-date?
I have never used them but I've heard that astrology + fortune telling are extremely cheaper, faster, more efficient, make magics and require to provide even less input than you did in this question.
"Anyway I didn't find the way to keep the OLAP cube up-to-date since the data in the original DB can change."
It is called ROLAP storage mode
It is usual for a OLAP database to be populated on a regular schedule from your OLTP database using some form of ETL (Extract, Transform, Load).
In the SQL Server world, that is often accomplished using SSIS.
I suggest you read these books:
来源：https://stackoverflow.com/questions/3950948/microsoft-sql-server-analysis-services-olap-cube