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MySQL: SQLSTATE[HY000]: General error: 3 Error writing file '/tmp/xyz' (Errcode: 28)

If you run MySQL and this error occurs:

 SQLSTATE[HY000]: General error: 3 Error writing file '/tmp/MYh0VgDS' (Errcode: 28)

then check if your server isn't using the famous "overflow" filesystem for /tmp, limited to 1 MB space.

The MySQL error message is - as usual - misleading and non-descriptive.

There are many other possible causes for this error code, so this one here might just be a hint.


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