How to find procedure what has taken

Question

Hi All,
I would like share one information on procedures code.
we have two schemas. one is ods_inb_stg and another one is ODS. We have written select statement for some tables from ODS_INB_STG schema with some columns are outer join (left or outer might be) and some columns are inner join.
my requirement is select some of the columns from ODS_INB_STG schema required tables and then insert into ODS schema corresponding table. Like that we have written select code. When ever we perform the code automatically populate the table.
For populate table we have to execute same code...... that's why we have created procedure and schedule the procedure for populate the table. That table truncate is truncate and insert.
we have not got any issues for that....... My questions are.....
1> we have some procedures when we executed those procedures how do we know those procedures are executed and what time and how much time procedure has taken ?
2> when ever person has executes a procedure where can we find this procedure has executed this time and this procedure starts this time and this procedure ends this time?
3> would server creates any log file this procedures executed this time and this procedures has taken this time? If yes where it will store (server) and can we find daily queries and what ever fired any queries related to database?
4> so many people access and fired a query, procedures, functions what ever can we find a log's for that........ In server where it will store?
(A part from control table and toad and developer what ever GUI)
Thanks and Regards,
Venkat

Answer 1

1> Keep a log table of start_time, end_time, procedure_name, errors etc. Simply create the table, then in your procedure, write the values into the log table
2> See above
3> See above
4> Have a google around.. Here's a starting point: https://netfiles.uiuc.edu/jstrode/www/oraview/V$SQLTEXT.html