MySQL - SQL_BIG_SELECTS

Question

Hey, I\'ve been investigating SQL_BIG_SELECTS, but the MySQL documentation so far has been pretty unhelpful. I\'m looking for some insight as to preventing errors like the o

Answer 1

As someone has post before, you can not set SQL_BIG_SELECTS on my.cnf at server startup. This kind of variable does not support that.

I had a same problem with a Symfony application showing this annoying error:

The SELECT would examine more than MAX_JOIN_SIZE rows; check your WHERE and use SET SQL_BIG_SELECTS=1 or SET SQL_MAX_JOIN_SIZE=# if the SELECT is okay

But you can increase the number of varialbe

max_join_size which is related to sql_big_selects

I was able to fix it executing a command as privileged mysql user:

# SET GLOBAL max_join_size=18446744073709551615;

Or you can include it in my.cnf because max_join_size is allowed to set up in configuration file

Well, I hope this can help someone else.