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I explained right before that the most crucial overhead of InnoDB is crafting the info twice (log and tables). This is really wrong, as it could essentially generate it 3 times (over the double compose region) and in some cases four situations, in the binary log. The binary log is not really enabled by default, though the double create is, because it safeguards from corruption.
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The subsequent will update a area (field9 which can be vacant) in TABLE1 with info from a industry (field9) in TABLE3 using joins with TABLE2 and TABLE3. I have made up the WHERE & AND conditions to point out this instance.
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