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walkerdba

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SQL> create tablespace my_tb datafile '/u01/oracle/oradata/repdb/my_tbs.dbf' size 100m; Tablespace created.


 SQL> create table my_tab tablespace my_tbs as select * from dba_objects;

why we are using the part " select * from dba_objects" in the query.....


??
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Andy Marshall
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Presumably to adopt the structure/columns of dba_objects as the basis of the structure of your table my_tbs, and possibly to import any records from dba_objects if there are any present in the table.

Happy New Year!!
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The sys.dba_objects view shows the data dictionary (every database object).  It is a commonly cited set of "random" data.  As your example shows, it's a quick way to populate a test table.  The other advantage is that it gives you a consistent test bed if you need to drop and repopulate the table.
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Geert G
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Or, are you asking: "Why create a table that is a copy of data that is already available from a view?"  One reason for doing this is for performance.  If you need to retrieve this data multiple times, repeated queries of this table will likely be much faster (and cause many fewer logical block reads) than a query from the view.
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