The resource requirements for the database cluster fluctuates even for one day. The total cost of investment will be reduced if you have the flexibility to reduce the deployed resources at night time and increase the attached database servers during peak hours. Using the Informix SDS cluster solution, you can define your own cloud of database server resources so that you have flexibility regarding the number of servers; in addition, it is easy to switch them on and off. Figure 7-8 shows a possible scenario for an database infrastructure. We define a flexible infrastructure for every day usage by attaching or detaching temporary database server resources that share the same subset of data. You can easily expand this example for monthly or quarterly usage.