title: What kind of datatype will be set in Pentaho kettle?
body: <p>I have a question about kettle performance tuning. The question is：  </p>
  
  <p>We use kettle to get data from Oracle database</p>
  
  <pre><code>CREATE TABLE demo_table(demo_field varchar(2000));
  INSERT INTO demo_table(demo_field) values('1');
  </code></pre>
  
  <p>We use kettle component table input, so when kettle get data from this table, how much memory space will it use in kettle? According to the datatype length or the real length?</p>
  
  <p>Also another component select values, you can select type, if type is none what does this mean?</p>