How to trace Very Long SQL and PLSQL?

Hi,
i need an advice on how to trace very long PLSQL as iam new to my company and the business is very new to me , i am a very good developer using Developer suite , but my weak point is tracing very long packages and undestand them ,
i want to trace a Procedure that have a LOT of lines of code and it calls many other packages, i really need to be quick in undestading what this procedre is doing as i should solve my problem in appropriate time
i am using dbms_output.put_line for tracing, to know what is the path that is taken and the variable values but i think i need a totaly different approach
also there are some sqls in this system that is very long, some of them is joining more than 10 tables at the same time, any hint to understand what this sql is doing?
any help is appreciated.

There is a trace facility for PL/SQL, but if you use it find a GUI interface. Trying to get it to work in SQL*PLUS standalone was painful. I think its supported by the major GUI tools like TOAD and PL/SQL developer but have not used it myself.
Other tools you can work with to help you debug and tune PL/SQL include Oracle trace (which analyzes SQL for efficiency, with an interpreter called tkprof) and DBMS_PROFILER. DBMS_PROFILER requires some initial set-up but can analyze PL/SQL code line by line and if used carefully function as a sort of limited trace.
Good luck!

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