Upgrade Procedures

When a new version of Informix Online is received by your shop what is your standard installation procedure? For example, let's assume that you currently have Online 7.20 installed on a UNIX box and you receive version 7.22. Let's also assume that you have ESQL/C and perhaps CLI also installed on this machine. Do you install 7.22 as a completely separate instance of Online and test it out and then install it again over the top of the production 7.20 version? If you run a separate test instance of Online then have you also installed separate copies of ESQL/C and so on? Are there any dangers in running multiple instances of Online on the same machine? I have looked at the Informix Migration Guide and chapter 5 deals with some of my questions. I suppose I am looking for practicle suggestions from those of you who have spent some time working with these products. Thanks for your advice. Dale Forrey, DBA email: forrey@wsu.edu Information Technology FAX: (509) 335-0540 Washington State University Phone: (509) 335-7098 Pullman, WA 99164-1222