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       col_name,
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       SUBSTR(col_name,
              INSTR(col_name || ',', ',', 1, 1) + 1,
              INSTR(col_name || ',', ',', 1, 2) - INSTR(col_name || ',', ',', 1, 1) - 1) C2,
 SUBSTR(col_name,
              INSTR(col_name || ',', ',', 1, 2) + 1,
              INSTR(col_name || ',', ',', 1, 3) - INSTR(col_name || ',', ',', 1, 2) - 1) C3
  from tab_name


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2.select * from dictionary;
describe dba_users;
select * from dba_users;
select name from v$controlfile;
3.
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select archiver from v$instance;
alter tablespace userdata read only;
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