title: If I could lock a few tables, would it be bad?
body: <p>Let's create Page.php</p>
  
  <pre><code> query1
   query2
   query3
  </code></pre>
  
  <p>Is there any way to lock a few tables, so if one user visits Page.php and second user opens this page a little bit later, second user would need to wait until the first user's all queries executes. </p>
  
  <p>And more importantly, would it slow a website very much if there are a few hundreds users on the same page at the same time?</p>
  
  <p>Thank you.</p>