What are the logical structure and physical structure in oracle

what are the logical structure and physical structure in oracle and how can allocate a DB block size as default size is 8192?

From the Concepts Guide
http://download-east.oracle.com/docs/cd/B19306_01/server.102/b14220/toc.htm
The physical structures are:
Datafiles
Control Files
Redo Log Files
Archive Log Files
Parameter Files
Alert and Trace Log Files
Backup Files
The Logical Structures are:
Tablespaces
Oracle Data Blocks
Extents
Segments

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