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migrating mySql DB to another partition resulted in mySql cant start with an exit code

sunhux asked
Last Modified: 2020-03-05
We tried to move current mySql DB out of Linux system
partition by following the instructions in the links below
but mySql gave an error after migration:


& how do I change the location of the data directory? (Doc ID 1023178.1)

# systemctl start mysqld
Job for mysqld.service failed because the control process exited with error code. See "systemctl status mysqld.service" and "journalctl -xe" for details.

DBA colleague told me there's not much of a clue from journalctl -xe
We're on RHEL 7.   Have also tried to create soft links to new partition
but it did not work.

What's missed?
Hopefull don't have to export all data out, recreate DB & re-import:
we don't want this option
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