title: What is the exactly meaning of "In_use" from "SHOW OPEN TABLES" command in mysql
body: <p><code>In_use</code> column from <code>SHOW OPEN TABLES</code> command in mysql is locking count as far as I know.</p>
  
  <p>But, After many times of reading data from table, <code>In_use</code> value has been increased.</p>
  
  <p>And all records of updating to that table is available.</p>
  
  <p>What is the exactly meaning of <code>In_use</code>?</p>
  
  <p>I've tested on MySQL 5.6 Community Server (Amazon RDS) with Default configurations and InnoDB.</p>