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3.2.55. TRACE([setting])

Returns the current value of the trace setting. If the string
setting is specified, it will be used as the new setting for
tracing, after the old value have be recorded for the return
value. Note that the setting is not an option, but may be any of
the trace settings that can be specified to the clause TRACE,
except that the numeric variant is not allowed with TRACE(). In
practice, this can be a word, of which only the first letter
counts, optionally preceded by a question mark.

     TRACE()   >   C  /* Maybe */
     TRACE(N)     >   C
     TRACE(?)     >   N