This is my first post under this forum, so kindly bear with me if any mistake done.... First of all about the topic...I have just started playing with Oracle and I have this 10g. Now the first thing that I have come across is one of the Background Process Database Writer. I have come to know that, in all we can have 20 DBWn i.e. from DBW0 to DBW9 and DBWa to DBWj. Now the question that is coming here in my mind is is there any specific reason why Oracle took 0-9 and then a-j and not 10-19 instead. Please let me know if there is any specific reason for it.... Please do not tell me that it is something related to the binary calculation or HEX or OCTA or something like that. Hope to get the exact answer.