Oracle Internals
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Parameters

TRACE_ENABLED

Version Type Default Session
Modifiable		 System
Modifiable
7.3.4 Boolean FALSE No No
8.0.4 Boolean FALSE No No
8.0.5 Boolean FALSE No No
8.0.6 Boolean FALSE No No
8.1.5 Boolean FALSE No No
8.1.6 Boolean FALSE No No
8.1.7 Boolean FALSE No No
9.0.1 Boolean FALSE No Immediate
9.2.0 Boolean FALSE No Immediate
10.1.0 Boolean FALSE No Immediate
10.2.0 Boolean FALSE No Immediate

This parameter specifies whether trace is enabled for both foreground and background processes.

Note that this parameter enables Oracle internal trace; it does not enable event 10046 trace.

Thanks to Irfan Hitay for the correction