Why do I get lots of noise in my photos on the D30 at long exposure times with 100 ISO speed? Help!

So I'm using a Canon D30 (3.1 megapixel). My ISO speed is set to 100, but when take phots at very slow shutter speeds I get a lot of noise. And I mean a lot. Can anybody help?

Long exposure time is the 2nd main way to get noise in an image.  Not a lot you can do other than post processing.  How long an exposure?  Perhaps a compromise like ISO 200 and a shutter that is half as long (twice as fast) would be slightly better if you played around with it.  Or perhaps that would be even worse.
Scott
Canon 6D, Canon T3i, EF 70-200mm L f/2.8 IS mk2; EF 24-105 f/4 L; EF-S 17-55mm f/2.8 IS; EF 85mm f/1.8; Sigma 35mm f/1.4 "Art"; EF 1.4x extender mk. 3; 3x Phottix Mitros+ speedlites
Why do so many people say "fer-tographer"? Do they take "fertographs"?

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