UTL_CALL_STACK : Get Detailed Information About the Currently Running Subprogram

 Oracle database 12c introduced the UTL_CALL_STACK package to allow programmatic access to the call stack and error stack, giving much greater flexibility for debugging and error handling of PL/SQL code. This is only a replacement for the existing functionality if you need the extra level of control. The existing functionality in the DBMS_UTILITY package is still available and has not been deprecated.

• Call Stack     prior to it we use DBMS_UTILITY.format_call_stack
• Error Stack   prior to it we use DBMS_UTILITY.format_error_stack
• Backtrace     prior to it we use DBMS_UTILITY.format_error_backtrace

The UTL_CALL_STACK package contains APIs to display the contents of the call stack in a more readable form.

refer https://oracle-base.com/articles/12c/utl-call-stack-12cr1

• DYNAMIC_DEPTH : The number of subprograms on the call stack, starting at the current position in the call stack, to the initial call.
• LEXICAL_DEPTH : Lexical depth of the subprogram within the current call.
• UNIT_LINE : Line number in the subprogram of the current call.
• SUBPROGRAM : Subprogram name associated with the current call.
• CONCATENATE_SUBPROGRAM : Returns the UNIT.SUBPROGRAM.LOCAL_SUBPROGRAM form of the subprogram name.
• OWNER : The owner of the subprogram associated with the current call.