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How to tune Oracle SQL with Histograms: Part 1 The Importance of Histograms

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Histograms are essential ingredient of Tuning SQL in the Oracle Database. In Oracle 12c there are new features related to Histogram. In this part of this histogram tutorial, Oracle Certified Master John Watson describes the importance of histograms. Histograms collect essential statistics such as data skew and thus accurately predict how many rows a predicate will select. This impacts critical decisions such as join order, join method and access method.
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