February 2018
Intermediate to advanced
510 pages
16h 10m
English
Content preview from MySQL 8 Administrator???s Guide
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Downgrading methods
An in-place downgrade means shutting down the new version of MySQL 8, replacing its binaries or packages with the old version of MySQL. Restarting the old version means MySQL 5.7 on the existing data directory. This downgrade method is supported between GA versions within the same series. Perform the following steps for an in-place downgrade:
- Shut down the newer version of MySQL 8.
- After the shutdown, remove the InnoDB redo log files from the data directory to avoid downgrade issues:
rm ib_logfile*
- Position the older version of MySQL in place of the newer version binaries or package.
- Start the downgraded version of MySQL by specifying the data directory, using the following command:
mysqld_safe --user=mysql --datadir=/path/to/existing-datadir ...
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