Someone recently mentioned in a thread here, possibly John Dorlon, that Oracle Trace Files were not very well documented. I can't find the thread now of course!
I've had piles of notes on the subject spread over many files for years, so I've gathered them all together and converted them into an eBook (pdf) that anyone can download and keep for free. Hopefully it will be of some use.
The book is on my Github repository, along with all the source code used to create it (in LaTeX format) so you are free to update it if you wish.
To obtain your free copy, with pretty pictures and a working index, goto:
github.com/.../OracleTraceFilesExplained.pdf
Then wait for the pdf to appear, then click the download button.
Enjoy.