| Statistics (2/3) |
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| • | Two basic types
attached to a grid |
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| – | Updated |
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| • | Statistics
initialised and kept up to date as |
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| underlying data
changes |
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| • | Better if
statistics are wanted |
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| – | Not updated |
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| • | Statistics not
initialised or kept up to date as |
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| underlying data
changes |
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| • | Better is
statistics are not wanted |
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