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MariaDB / MySQL: export or backup data to a CSV file

It seems there are several ways to do this. Here is one, using the mysql prompt. I used mysql root account because my usual user has not enough permissions to write files (ERROR 1045 (28000): Access denied for user 'username'@'localhost' (using password: YES)), even after a chmod 777: UPDATE: We need to grant file access to the database user:

$ mysql -u root -p
Enter password:
[...]
MariaDB [(none)]> GRANT FILE ON *.* TO 'username'@'localhost';

GRANT ALL does not include file permission. Now we can execute a query and output it into a CSV file. Formatting options are available:

$ mysql -u username -p database_name
MariaDB [database_name]> SELECT field1, field2, field3 INTO OUTFILE 'database_name_export.csv' FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"' LINES TERMINATED BY 'n' FROM table_name;

Not specifying a path put the file in /var/lib/mysql/database_name. When I use /tmp/database_name_export.csv, the file is written in /tmp/systemd-private-14da7...-mysqld.service-.../tmp/. This behaviour happens on an encrypted Arch Linux system.

Also note that mysql won't overwrite an existing file, for security reason: ERROR 1086 (HY000): File '/tmp/database_name_export.csv' already exists.

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