Mysql Set Sql Safe Updates
Description: The sql_safe_updates variable does not work when set in global scope. How to repeat: mysql> set global sql_safe_updates=1; Query OK, 0 rows affected (0.
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This is fresh mysql install from Debian apt. Mysql s - mysql Ver 14.14 Distrib 5.5.47, for debian-linux-gnu (x8664) using readline 6.3. Server version: 5.5.47-0+deb8u1-log (Debian) Protocol version: 10 Connection: Localhost via UNIX socket. Note that you are running in safeupdatemode: UPDATEs and DELETEs that don't use a key in the WHERE clause are not allowed. This is how it's set: mysql show global variables like 'sqlsafeupdates'; +-+-+ Variablename Value +-+-+ sqlsafeupdates OFF +-+-+ mysql show variables like 'sqlsafeupdates'; +-+-+ Variablename Value +-+-+ sqlsafeupdates ON +-+-+ There's no sqlsafeupdates setting on any config file ( my.cnf or /.my.cnf etc.). Why it's set to ON for my session (run mysql from root). From, you obtain the command to change the setting for sqlsafeupdates (from the mysql client command line).
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It's fairly simple - SET SQLSAFEUPDATES=0; (or 1), though as you point out, it can't be modified in my.ini or my.cnf. However, from on StackOverflow, you have a method to on server startup. Briefly, you create a file called (arbitrary).sql and put the command above setting the sqlsafeupdates in that file.
Then, in the mysqld section of the my.ini (or my.cnf), you put the line init-file='C:/xxx/yyy/.sql' To answer your specific question, there is a reason that the default is ON. This is because many software developers are not very proficient in SQL. To compound this problem, many of them use frameworks which produce SQL which is (ahem.) not optimal. If one ran a command DELETE FROM TABLE on a production system, this could cause havoc (and has done, judging by the number of posts here pleading for help with a deleted table). Note: I tested this on Windows (don't have Linux up and running at the moment).