x$ constructs and memory

I was sitting on a mountain here in Colorado, pondering Oracle optimization and an interesting scenario crossed my feeble mind. As I began to ponder this (I asked the resident marmot, but he must be a SQL*Server expert...), I came up with several questions.

Where in memory (sga or other) do the x$ constructs reside? Some of them are 'populated' by reading file-based structures
(control file, datafile headers, undo segments). Does this
information reside in memory or is it loaded each time the x$ construct is accessed?
What happens when these x$constructs begin to consume large amounts of memory? Is there an upper bound?

Daniel Fink

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Author: Daniel Fink
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