how to avoid deadlock in mysql

Question

I have the following query (all tables are innoDB)

INSERT INTO busy_machines(machine) 
               SELECT machine FROM all_machines 
               WHERE mach         


        

Answer 1

You will probably get better performance if you replace your "NOT IN" with an outer join.

You can also separate this into two queries to avoid inserting and selecting the same table in a single query.

Something like this:

           SELECT a.machine 
           into @machine
           FROM all_machines a
           LEFT OUTER JOIN busy_machines b on b.machine = a.machine
           WHERE a.machine_name!='Main' 
           and b.machine IS NULL 
           LIMIT 1;

           INSERT INTO busy_machines(machine) 
           VALUES (@machine);