MySQL
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* fix mysqldump error after upgrade

  .. versionadded:: @2012-11-17
     创建

  After mysql upgrade, mysqldump may fail w/ following error:

  *Error: Couldn't read status information for table general_log ()
  mysqldump: Couldn't execute 'show create table \`general_log\`': Table 'mysql.general_log' doesn't exist (1146)*

  Fix it by run mysql_upgrade!