How feedback statistics really works in 12 c?

Hello

I'm studying 12 c material and have a question about the feedback statistics (or Feedback: cardinality).

Reading on the Feedback from statistics, I understand that the actual number of lines is written in a Directive Plan

-In the first execution of a SQL statement, the optimizer generates an execution plan.

-After the first performance, the optimizer disables comments from statistics tracking.

-If the query runs again, the optimizer then uses the corrected instead of its usual estimate cardinality estimates.

Source: http://docs.Oracle.com/database/121/TGSQL/tgsql_optcncpt.htm#TGSQL94983

But what happens if the data becomes spread out in the next few hours and the plan should better not be used?

When and how the plan will become invalid and will be the optimizer hard parse a new plan?

Is anyone able to explain that to me?

Thank you in advance.

Kind regards

Harry

Hello. This feature is on the bad rating because of missing statistics. And solves the problem once. To modify data, the work of gathering must do the right thing.

Tags: Database

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