Siebel Personalization Administration Guide > Targeting Content by Using Expressions >

Rule Sets Best Practices

Limiting the number of rule sets is good practice. This is because each rule set is a query built by adding all the rules together. The rules contribute to the final query, but do not cause a query by themselves. Therefore, you can create as many rules as you like, but create rules sets carefully.

The sequence you set for rule set evaluation is important. If the system must evaluate many rule sets before getting one that returns content, performance can be affected noticeably.

Siebel Personalization Administration Guide