AUDIT_TRAIL

Parameter type:	String
Syntax	AUDIT_TRAIL = {NONE | FALSE | DB | TRUE | OS}
Parameter class:	Static
Default value:	NONE
AUDIT_TRAIL enables or disables the automatic writing of rows to the audit trail.
NONE or FALSE: Audit records are not written. OS: enables system-wide auditing and causes audited records to be written to the operating system's audit trail. DB or TRUE: enables system-wide auditing and causes audited records to be written to the database audit trail (the SYS.AUD$ table).
You can use the SQL statements AUDIT sql_statements and AUDIT schema_objects to set auditing options regardless of the setting of this parameter. See Also: Oracle8i Administrator's Guide.