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Update README.md
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@@ -684,7 +684,7 @@ The following guidelines indicate when the use of an index should be reconsidere
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**- Tables that have frequent, large batch updates or insert operations.**
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**- Indexes should not be used on columns that contain a high number of NULL values.
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**- Indexes should not be used on columns that contain a high number of NULL values.**
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**- Columns that are frequently manipulated should not be indexed.
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