title: ORA-01653: unable to extend table by in tablespace ORA-06512
body: <p>I tried to generate some test data by running the following sql.</p>
  
  <pre><code>BEGIN    
    FOR i IN 1..8180 LOOP
      insert into SPEEDTEST
      select 'column1', 'column2', 'column3', 'column4', 'column5', 'column6', 'column7', 'column8', 'column9', 'column10', 'column11', 'column12', 'column13', 'column14', 'column15', 'column16', 'column17', 'column18', 'column19', 'column20', 'column21', 'column22', 'column23', 'column24', 'column25', 'column26', 'column27', 'column28', 'column29', 'column30', 'column31', 'column32', 'column33', 'column34', 'column35', 'column36', 'column37', 'column38', 'column39', 'column40', 'column41', 'column42', 'column43', 'column44', 'column45', 'column46', 'column47', 'column48', 'column49', 'column50', 'column51', 'column52', 'column53', 'column54', 'column55', 'column56', 'column57', 'column58', 'column59', 'column60', 'column61', 'column62', 'column63', 'column64', 'column65', 'column66', 'column67', 'column68', 'column69', 'column70', 'column71', 'column72', 'column73', 'column74', 'column75', 'column76', 'column77', 'column78', 'column79', 'column80', 'column81', 'column82', 'column83', 'column84', 'column85', 'column86', 'column87', 'column88', 'column89', 'column90', 'column91', 'column92', 'column93', 'column94', 'column95', 'column96', 'column97', 'column98', 'column99', 'column100', i from dual;
    END LOOP;
  END;
  /
  commit;
  </code></pre>
  
  <p>and it gave me following error:</p>
  
  <pre><code>ORA-01653: unable to extend table LEGAL.SPEEDTEST by 128 in tablespace LEGAL_DATA
  ORA-06512: at line 4
  </code></pre>
  
  <p>Which indicates that I ran out of space, <strong>how do I add more and how to know how much do I need? What 128 stands for?</strong></p>