Pls answer the Question

Hi All, 

     Could you pls answer the below questions

1.What is Escalation and Exception which scenario will use?
2.How do u confifure Parallel Processing in Process Model?
3.Wta is Write to single and multiple write to datastore smart service?
4.Different example where we use single and multiple write to datastore smart service
and best practices of using them?
5.What are the different types of log file?  

Thanks in Advance!