Download Data Warehouse performance and maintenance

Data warehouse performance and maintenance
Data warehousing has become an important technology even for small to mid-size companies for data
analysis. One of the issues we encounter with data warehouses is performance, since we combine large
amount of data from multiple data sources.
Database Statistics
Very often we hear from our customers that reports that used to run very quickly now take a lot longer.
And they claim that there has been no change in their system. How can this happen ?
One of the reasons is that SQL server is not processing all the operations in the most efficient way.
When you run a report, One Stop Reporting sends a set of SQL commands to SQL server and process
them in the order they are received. Just like there are many different solutions to the same math
problem, there are different ways for SQL Server to process the same commands, and some are more
efficient than others. How does SQL server determine how to process commands? They make
decisions based on database statistics, which is not updated automatically. Attached document shows
step by step process of how to create and schedule a database maintenance plan.
Indexes and how to maintain them
Limit data only to the last 2-3 years