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Many thanks a lot for sharing the insight on OPT_ESTIMATE trace and Sure the coe_xfr by oracle script is certainly a versatile script since it lets you edit the hints or sql_text during the produced script that you could operate wherever.
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1) I ran SQL Tuning Advisor on a particular query plus the optimizer came up with the greater execution system for that question. The proposed plan from the optimizer was with parallel execution, and when this parallel execution system was enabled for that query the optimizer calculated the DOP extremely large along with the question ran with superior parallelism, then the accessible cores around the technique. In this type of situation how to embed the hints More Help manually to ensure we will move the hints with much less DOP.
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Several months back I arrived up by having an idea / need which I now understood could be doable devoid of A lot engineering on my element. My contemplating was that It might be wonderful if oracle saved from the historic general performance on queries (which I now realized it does for perhaps ten times in dba_hist_sqlstat, dba_hist_sqlplan and dba_hist_sqltext ) so that immediately after an up grade (or optimizer parameter modify) we could take care of the sql that isn't carrying out well and see the way it did before.
Interestingly, that column will not be populated for your SQL Profiles but is populated with the Baselines. But it also includes a column that contains the hints, which is populated for equally Baselines and Profiles. So I really need to carry out some far more analysis into The problem, but this issue I’m guessing/hoping Baselines do not use hints. (I haven’t found a spot exactly where they'd be stored still although)