Two years ago Ovais Tariq had explained in detail what kinds of problems existed before MySQL introduced metadata locks in 5.5.3 and how these locks help to prevent them. Still, some implications of metadata locking in MySQL remain unclear for users  DBAs and even software developers that target recent MySQL versions. Ive decided to [&]

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http://www.percona.com/blog/2015/04/07/more-on-transactional-mysql-metadata-locks/