title: error in locking 'pma__column_info' after change in config.inc.php
body: <p>I need to import some big sql text files (120 and 300 MB) to a local database via phpmyadmin. I succeeded at the smaller dbs, around 8 and 18 MB, but got several time-outs on the next one (120 MB).</p>
  
  <p>Following a suggestion <a href="https://stackoverflow.com/a/21641325/1086511">here</a>, I inserted "$cfg['ExecTimeLimit'] = 0;" in two different places in config.inc.php, and now I got this error:</p>
  
  <pre><code>SQL query: DocumentationEdit Edit
  
  SELECT `comment`
  FROM `phpmyadmin`.`pma__column_info`
  WHERE db_name = 'bot4b'
  AND table_name = ''
  AND column_name = '(db_comment)'
  
  MySQL said: Documentation
  #1100 - Table 'pma__column_info' was not locked with LOCK TABLES 
  </code></pre>
  
  <p>I commented out the "$cfg['ExecTimeLimit'] = 0;", but the error persists. I restarted apache and even rebooted.</p>
  
  <p>After the boot, I created a new database, and tried to reimport the smaller one (8 MB), with the same error.</p>
  
  <p>I think it's not a user/password problem, and I'm afraid to try the suggestion <a href="https://stackoverflow.com/a/18226505/1086511">here</a> without knowing what I'm doing. I prefer to understand what's happening than just applying blind fixes that could ruin the system even more. (Btw, my 'controluser' and 'controlpass' are uncommented, and set to local variables $dbuser and $dbpass as default.)</p>
  
  <p>I'm using Ubuntu 14.04, Apache 2.4.7 (Ubuntu), MySQL 14.14 and PHP 5.5.9-1ubuntu4.11 (cli)</p>
  
  <p>Thanks in advance.</p>