How to identify the use of the contours?

Operating system: Sun Solaris x 86-64
DB: 10.2.0.3.

The production system has been improved to 8.1.7.4 to 10.2.0.3 (RBO to CBO) last year. Just after the upgrade, there are some severe performance with SQL issues and we had to create some outline for the stability of the regime that helped us a lot to ALBUMS.

We noticed that the lines were used by looking at the status of
select name,used,timestamp from dba_outlines and
select ol_name,flags from outln.ol$ (flags switched from 0(UNUSED) to 1 (USED)
Here's my question:
In my view, that the timestamp is when the contours are used for firsttime. We are trying to identify, and if possible, drop these contours because we made some changes to our process of collection of statistics and best performance, we see overall results for other SQL.

We plan to update the indicators from 1 to 0, which would make it the contours of UNUSED State and if the SQL whose contours are created being issued, contours must be used and the flags would be updated to 1.

Is there any other way to achieve the same?

Anantha.

By documentation, OUTLINE_CATEGORY null means line has not been used.

Tags: Database

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