cardinality in A Sentence

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    We will see some examples of Cardinality later in this guide.

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    Also given the nature of a binary search, the Cardinality or uniqueness of the data is important.

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    The Cardinality of the set“S” is“5” which is the total number of elements contained inside a set.

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    The Cardinality of a set is also called its size, when no confusion with other notions of size is possible.

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    For example, the set A{ 2, 4, 6}{\displaystyle A=\{2,4,6\}} contains 3 elements, and therefore A{\displaystyle A} has a Cardinality of 3.

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    Indexing on a field with a Cardinality of 2 would split the data in half, whereas a Cardinality of 1,000 would return approximately 1,000 records.

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    With such a low Cardinality the effectiveness is reduced to a linear sort, and the query optimizer will avoid using the index if the Cardinality is less than 30% of the record number, effectively making the index a waste of space.

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    With such a low Cardinality the effectiveness is reduced to a linear sort, and the query optimizer will avoid using the index if the Cardinality is greater than 30% of the record number, effectively making the index a waste of space.

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