| DataGuides |
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| • | How
large are the dataguides ? |
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| – | if DB
is a tree, then size(G) <= size(DB) |
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| • | why?
answer: every node is in exactly one extent of G |
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| • | here:
dataguide = XSet |
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| – | How
many nodes does the strong dataguide have for |
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| this
DB ? |
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| Dataguides usually fail on data with
cyclic schemas, like: |
