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Continue to ChatLOCK TABLES in MyISAM is NOT a poor man's tranactions substitute https://code.openark.org/blog/mysql/lock-tables-in-myisam-is-not-a-poor-mans-tranactions-substitute
LOCK TABLES in MyISAM is NOT a poor man's tranactions substitute https://code.openark.org/blog/mysql/lock-tables-in-myisam-is-not-a-poor-mans-tranactions-substitute