title: Create index on existing table Oracle
body: <p>Is it safe to create an index on an existing table in oracle? </p>
  
  <p>Like this:</p>
  
  <pre><code>CREATE INDEX table_sample_ix03
        ON table_sample
  (
    col4,
    col22
  )
  TABLESPACE data
  STORAGE
  (
    INITIAL        10M    NEXT          2M
    MINEXTENTS      1     MAXEXTENTS  100
    PCTINCREASE     0
  )
  ;
  </code></pre>