[wp-trac] [WordPress Trac] #60036: Raise the minimum required version of MySQL to 5.5.5

[WordPress Trac]

#60036: Raise the minimum required version of MySQL to 5.5.5
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 Reporter:  desrosj       |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  6.5
Component:  Database      |    Version:
 Severity:  normal        |   Keywords:  has-patch commit
  Focuses:                |
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 The minimum version of MySQL required to run WordPress has sat at 5.0
 since 2011 (see [17523]).

 MySQL 5.0 was initially made generally available in 2005 and reached its
 end of life (EOL) in January of 2012, making it unsupported and insecure
 for over 12 years. This is extremely old and this requirement is being
 raised.

 Currently, only 0.4% of all WordPress sites are running either version 5.0
 or 5.1 of MySQL.

 Usage for MySQL 5.5 sits at just under 15%, making it the logical landing
 point. Of all sites running 5.5.x, 100% of them are running 5.5.5 or
 higher. `utf8mb4` support was introduced in 5.5.3, and `InnoDB` was made
 the default storage engine over `MyISAM` in 5.5.5, making it worthwhile to
 use the 5.5.5 point release instead of any 5.5.x version (`utf8mb4` is the
 preferred default character set).

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Ticket URL: <https://core.trac.wordpress.org/ticket/60036>
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