Oracle Internals
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Parameters

_KKFI_TRACE

Version Type Default Session
Modifiable		 System
Modifiable
8.1.5 Boolean FALSE Yes No
8.1.6 Boolean FALSE Yes No
8.1.7 Boolean FALSE Yes No
9.0.1 Boolean FALSE Yes No
9.2.0 Boolean FALSE Yes No

This parameter enables tracing of expression substitution. Expression substitution occurs when function based indexes are used