Question

I am using Rails v2.3.2 with MySQL v5.1 and mysql2 gem.

I run the following rake tasks in a method like:

def db_operation
    Rake::Task['db:drop'].invoke #this one does not work
    Rake::Task['db:create'].invoke
    Rake::Task['db:migrate'].invoke
    ...
 end

but Rake::Task['db:drop'].invoke does not drop my database**, and there is no error message which makes me have no clue to find the reason.

Then:
I go to MySQL command-line to execute “DROP DATABASE my_db;” , it raise me the following error message:

ERROR 1010 (HY000): Error dropping database (can't rmdir './my_db/', errno: 17)

After that:
I run above code again, the database surprisingly get dropped…

What was happening?? Why my rake db:drop does not drop database, but after I run drop command on MySQL command-line and run rake db:drop again, it get dropped??? (and I got error when I run on MySQL command-line)

P.S.

rake db:create and rake db:migrate are working without problem.

Answer 1

Refer this LINK

you might be having files in /var/lib/mysql/my_db/ that mysql didn’t create.
Try listing those files and see what’s there. Try moving anything there to a temporary directory (or deleting if you’re really sure you won’t need them), then try again.