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Tiers Subclasses can be organized into numbered tiers, so that the higher-numbered tiers only obtain resources after all lower-numbered tiers are satisfied. Thus system processes and critical services may be in tier 0, with normal applications in tier 1, and background processes in tier 2. For a WebSphere service there may be some Tier 2 processes, such as log maintenance, but most would be Tier 1.

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