Execute MySQL query in multiple databases at once

Question

I have many MySQL databases that have same tables with the same structure. I am looking for simple way how can I alter table structure in all of the databases at once ( in one query or using one tool).

Answer 1

you can see this solution like of alter many tables in the post :

select concat( 'alter table ', a.table_name, ' add index `fields` (`field`);' )
from information_schema.tables a 
where a.table_name like 'table_prefix_%';

Answer 2

A QND way, but anyhow,

• make changes on main-db with prefered tool.
• copy successful sql-statement to web-script (php or similar) that executes the sql with loop on defined 'slave' dbs.

//regards