Using Excel files as the source for Informatica mappings can be more trouble than it's worth. You have to setup a connection and name a range in the Excel document which can be difficult to maintain. I much prefer to read text or CSV files, they're simpler to work with and less error prone. I created a VB script for the purpose of converting Excel to CSV.
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Here are some SQL scripts you can use to query the repository. Most of these I got from an Informatica employee, others I put together. Use them as a base to create your own queries or reports.
One word of caution, use a profile with READ ONLY permission to access the repository and NEVER update the repository using SQL unless advised to do so by Informatica support.
Here’s the companion script for the “Using pmrep to export an Informatica folder” article. Use this script to import objects into PowerCenter.
One use for scripting an import would be to schedule it during off hours, for example moving development code to production during off hours. You may also need to export some objects, then do a "mass change" or Find/Replace on the XML file, then export them back in (for example, export all sessions, find/replace a connection).
