Hi Stefan,
Thanks for your response.
Checking the tables statistics I can only see SELECTS and INSERTS operations. I cannot see ITL waits on these tables as well.
If I understand correctly, a new ITL is only needed if the same block is modified by another process, I mean, if you have 2 ITLs and there are 3 processes updating the same block a new ITL will be created for this block till you have enough free space in the block header (depending on the PCTFREE) ...
My doubt is if with several INSERTS in parallel we can face the deadlock problem. For updates is very clear for me that it can happens but I'm not sure with INSERTS. What do you think?
Regarding the reduction, last weekend we have reduced the INITRANS from 100 to 1 and reorg the tables in a test environment but the result hasn't been the expected. The size has been reduced but very few. Is also true that we don't know when the INITRANS was changed and how (with or without reorg).
Honestly is very difficult to found something with block dumps because these tables have 64642928 and 5352312 blocks and I don't know which blocks were updated.
Cheers.
Jose