Database statistics describe and give information about the data within a database. When the data is retrieved from the database via a query, the query optimizer generates an execution plan for the qu...
This is the third article of my 12c Adaptive Sampling series. Previously, we saw in Part 1 how ADS works for a single table (also for a group by clause) and in Part 2 for joins. As you know join card...
This is the second article of my 12c Adaptive Sampling series. In part I, we saw how dynamic sampling estimates single table and group by cardinality. In this part we will focus on how Adaptive Dynami...
In this article you will learn how Oracle 12c dynamic sampling works. Cases where it helps the optimizer do good estimations as well as cases where it doesn’t will be presented. Only single table sele...
