Definitons of scema,direcotry,dictionary,control file,library..please help

hi ,
Can you please tell me the defintions of scema,direcotry,dictionary,control file amd library in oracle
Please help me by giving the definitions.....

Is it a kind of homework ?
Information you ask for are available through many system views. When I ain't sure of it's name I usually do something like this:
select *
  from all_objects
where object_name like '%CONTROL%'to get a list of objects that might help me finding control files.
Another method is actually searching for information in dictionary view.

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