| Caching |
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| Ÿ | Any application
that caches data, now has |
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| to deal with
stale data |
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| Ÿ | When and how to
refresh? |
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| Ÿ | Will constant
refreshing overload the |
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| database? |
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| Ÿ | Problem is
compounded in a clustered |
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| environment |
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| Ÿ | App server may
want be notified of |
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| database changes |
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