Bibus processes

[Severin]

hello,

I have a report containing 93 objects between list and graphics splitted in 20 report pages. I use around 30 cognos query in my report.
whenever I execute the report,  it works fine at first but then it shows a message of impossible connection to database. I found out  that the number of processes (bibus) generated by the report is huge (132) which saturate the Oracle database.   

what I want to understand is the logic of processes generated. How does it work? do u know any detailed article explaining the functioning of cognos report studio when executing reports? where do I find bibus files?

Thank you in advance!