All the new manageability features with the exception of Automatic SGA Memory Tuning are enabled when the initialization parameter STATISTICS_LEVEL is set to TYPICAL, which is its default value. When the STATISTICS_LEVEL parameter is set to TYPICAL and Automatic SGA Memory Tuning is also enabled, the impact on performance is under 5%. In fact, of the various applications tested, the worst-case performance degradation observed was only about 3.4%, while most applications showed 1% or smaller performance impact.
Keep in mind that performance overhead is relative to a perfectly tuned application. Given that most real-world applications are not perfectly tuned, they can actually expect to see a performance improvement in their applications since many of the new manageability features proactively enhance database performance without requiring any manual intervention by a DBA or a performance engineer. More.
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