title: insert into one table selecting from another works slow. (Sybase)
body: <p>SYBASE</p>
  
  <pre><code>insert into table_1
  select * from table_2
  </code></pre>
  
  <p>the query works very slow. Table_1 is empty but has a clustered index, table_2 has 70 mln rows, and 72 columns. 
  Any suggestion?</p>
  
  <p>Thanks,
  Oleg</p>