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I checked database and found 200Kb / 200.000 chars stored in the "data" column in each row of my stored youtube media field.
It seems like a serialized XML response from Youtube, there is something wrong in the fetcher and parser I think.
I also tried to clear the data directly in the database, but after update of the node was data columns filled again.
Export of the "data" column (for single file) is attached.