Share you favorite systems regression tests

We are cloning our production environments frequently since we have many development phases in the works. There are some common issues that occur to the environments. I thought I would start a discussion on how to validate a newly cloned ASCP environment is functioning. (Not validate the model) This checklist was especially handy when we changed environments from AIX to Linux.

Here's what I do and I'm interested if anyone else has something more to add.

1) Validate the instances & some system profile options

     select * from MRP_AP_APPS_INSTANCES_ALL on EBS (should only return one line)

     select * from MSC_APPS_INSTANCES on ASCP (should only return one line)