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I have recently installed MSQL for a Rails App. After some tinkering, I have an error starting mysql now that reads as follows:

Warning: The /usr/local/mysql/data directory is not owned by the 'mysql' or '_mysql' user.

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migrated from May 24 '11 at 12:46

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"Not a programming question." – Anonymous May 22 '11 at 21:26

in terminal as root (or do sudo + below command):

chown -R mysql:mysql /usr/local/mysql/data
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Thanks! It worked! – Anonymous May 22 '11 at 21:33
Glad that worked for you, but on numerous OS's like 10.6 you actually want to make sure and use the _mysql user/group. – quest May 23 '11 at 3:08

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