Tkprof

http://docs.oracle.com/cd/B10500_01/server.920/a96533/sqltrace.htm
http://docs.oracle.com/cd/B28359_01/server.111/b28274/sqltrace.htm
http://www.orafaq.com/wiki/TKProf
https://oracle-base.com/articles/8i/tkprof-and-oracle-trace
http://www.dbspecialists.com/files/presentations/use_explain.html
https://www.youtube.com/watch?v=dH_bPLtdbc4
http://betteratoracle.com/posts/14-sql-trace-and-tkprof
http://www.dba-oracle.com/tips_oracle_tkprof_utility.htm
http://www.toadworld.com/platforms/oracle/w/wiki/5848.sql-trace-and-tkprof