MySQL 5.5 Reference Manual :: 2 Installing and Upgrading MySQL :: 2.11 Upgrading or Downgrading MySQL :: 2.11.2 Downgrading MySQL :: 2.11.2.1 Downgrading to MySQL 5.1

2.11.3 Checking Whether Tables or Indexes Must Be Rebuilt »

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2.11.2 Downgrading MySQL
2.11.2.1 Downgrading to MySQL 5.1

2.11.2.1. Downgrading to MySQL 5.1

When downgrading to MySQL 5.1 from MySQL 5.5, you should keep in mind the following issues relating to features found in MySQL 5.5, but not in MySQL 5.1:

InnoDB. MySQL 5.5 uses InnoDB Plugin as the built-in version of InnoDB. MySQL 5.1 includes InnoDB Plugin as of 5.1.38, but as an option that must be enabled explicitly. See Changes in MySQL 5.1.38.

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