8c84504f_riving_for_Optimal_Performance__Description
[Level] 64 [Description] 
As in level 1, plus the execution plans information might be written for executions following the first one. The condition is that, since the last write of execution plans information, a particular cursor consumed at least one additional minute of DB time. This level is interesting in two cases. First, when the information about the first execution is not enough for analysing a specific issue. Second, when the overhead of writing the information about every execution (level 16) is too high. Generally available as of 11.2.0.2 only.
Event 10046 – Full List of Levels | Striving for Optimal Performance
Description