How to implement Snap shots and Meterialized views in Postgres

Hai,
i am femiliar with Oracle9i and Pl/Sql. Sufficient knowledge in
Postgres...
Now we are using Postgres8.1 according to client requirement in my
Project.
Now, I want to implement Meterilized views and snapshots concepts in my
project .
How to implent this one..

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Vivekananda.R <mailto:vivekanandaswamyr(at)infics(dot)com> | Software Engineer
| CGDA Program.
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