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  Tutorial: Database Oracle Global Statistics vs. Histograms with DBMS_STATS Package Tutorial

Optimisation is the process of choosing the most efficient way to execute a SQL statement. The cost-based optimiser uses statistics to calculate the selectivity of predicates and to estimate the cost of each execution plan.

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Global Statistics vs. Histograms with DBMS_STATS Package

Optimisation is the process of choosing the most efficient way to execute a SQL statement. The cost-based optimiser uses statistics to calculate the selectivity of predicates and to estimate the cost of each execution plan.

You must gather statistics on a regular basis to provide the optimiser with information about schema objects. New statistics should be gathered after a schema object's data or structure are modified in ways that make the previous statistics inaccurate.

Statistics for Partitioned Schema Objects

Partitioned schema objects may contain multiple sets of statistics. They can have statistics which refer to the entire schema object as a whole ( global statistics ), they can have statistics which refer to an individual partition, and they can have statistics which refer to an individual sub-partition of a composite partitioned object.


 

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