From: Rich Prohaska Date: September 27 2012 4:27pm Subject: execution of the update rows event on a replication slave in mysql 5.6.6-m9 List-Archive: http://lists.mysql.com/internals/38589 Message-Id: MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Hello, We noticed that the 5.6.6-m9 code that handles the update rows log event on a slave looks as if it no longer fetches the row as MySQL 5.5 does (5.5 calls find_row to fetch the row) before calling the storage engine update_row method. Here are some questions: 1. Is it in fact the case that 5.6 does not read the row when executing update log events on the slave? The log event has the before and after update versions of the row, so reading the row seems redundant. 2. Why was this change made? 3. Can the same change be applied to MySQL 5.5? If so, are there any addition changed needed? Thanks Rich Prohaska