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  1. MariaDB Server
  2. MDEV-626

LP:639949 - Non optimal index choice, depending on index creation order

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      Hi,

      There are several simple cases where MySQL optimiser doesn't select the right index. This entails strong performance issues, and force the developers to hack their applications, using USE INDEX (when it's possible...)

      This wrong optimizer behaviour is explained in detail here : http://bugs.mysql.com/bug.php?id=36817

      The bugs also occurs both in MariaDB 5.1 & 5.2.

      Since this bug is around for more than 2 years now, I really hope it could be fixed really soon in MariaDB.

      Thanks and regards,
      Jocelyn Fournier

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          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. MDEV-465 Optimizer : wrong index choice, leading to strong performances issues

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Closed

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              jocelynfournier jocelyn fournier
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