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Editorial Team
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Asked: 2026-05-15T18:35:04+00:00

I have these lines at the top of a MySQL .sql file (dumped with

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I have these lines at the top of a MySQL .sql file (dumped with phpMyAdmin):

/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8 */;

But they all seem to be commented out. So will MySQL ignore them when the file is loaded back into a database? If so, why generate these lines at all?

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1 Answer

  1. Editorial Team

    These are conditional comments aimed at certain versions of mySQL.

    From here and here:

    • MySQL version specific comments start with /*!
    • And end with */
    • Version numbers are always 5 digits
    • Version numbers are in the format major release number,
      minor release number, revision number with the major being 1 digit
      and the minor and revision being 2 digits left-padded with 0’s
    • Version specific comments will target any version equal to or higher than
      the version number listed
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