Ans1) It is the same table name.
Ans2) I think you mean persist(memory) = cache and unpersist. 
If it is your program is caching an dataframe you unpersist it manually. 
I think if your cached data structure is not being utilized then the new
cache will evict the old one. 
But if memory is your concern you can use persist(memory & disk) where you
data will spill to disk.

..Manas




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