Snapshot queries and activity rights?

Anyone know the absolute bare minimum activity rights a user needs to have for creating snapshot queries? I keep getting "user does not have adequate rights to create portlets" in PTSpy, even though they have access to "create portlets" and "create snapshot queries" activity rights.
Any help much appreciated,
Thanks,
Eric

Michael,
Thanks for your response. I did read through your post. Our DB_CONFIG is similar to what is outlined there. The issue that we are running into stems from the way we use dbxml. To speed up paging when a user is viewing a large dataset, we keep XmlResults open for a certain time duration. This leads to read lock one or two pages (the pages that contain the current result). We thought if we switch to MVCC, even that lock will go away and if a writer tries to update document(s) in those pages, a copy of those pages will be made. However, we were surprised to find that all the previous pages seen (they were not locked in the non-MVCC scenario) were also copied. This led to an abundance of freezer files and performance impact.
What I am trying to figure out is,
1. is our diagnosis correct (we are assuming that the previous pages were also copied - but not really sure about that)
2. If our diagnosis is correct, is there any configuration magic that we can do to prevent unnecessary page copies (by unnecessary, I am referring to pages that were not locked in the non-MVCC scenario).
A related question is, I have noticed that the freezer files continue to stay in the filesystem even where there are no active transactions. When do these files get removed?
Thanks
Chelliah

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