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would a MYSQL sort on the whole table
select * from mytable order by col;
lock the table or would it be some ranged lock depending on the process state?
or would there be no lock?
In so far as I’m aware, it locks nothing in the default isolation level (i.e. read committed). See:
http://dev.mysql.com/doc/refman/5.1/en/innodb-locking-reads.html