Mysql 5.6 headaches on Mac OSX

Question

Several of my colleagues and I have recently upgraded from MySQL 5.5 to MySQL 5.6 using homebrew on our Macs to test locally before upgrading our servers. Since this upgrad

Answer 1

We found that using the following fixes this for us:

brew install mysql --use-llvm

This is on a rails 2.3 ontop of REE (1.8.7) in rbenv on OSX 10.8. YMMV

Answer 2

I'm having the same issue on same configuration (mysql 5.6.12). I've just upgraded mysql with homebrew to version 5.6.13 and the problem is gone.

Answer 3

I struck this problem with mysql 5.6.16, freshly installed via Homebrew on Mavericks, along with rbenv and rails etc.

Decided to reboot before working through the other solutions here. Problem solved!

So if you haven't rebooted since installing mysql etc, I'd recommend restarting before working through the answers here.

Answer 4

None of the answers here helped me, but finally I got MySQL 5.6 to work.

THREE options to fix MySQL 5.6:

1. (confirmed) Edit /etc/my.cnf (create if not exists) and add:

   [mysqld]
   innodb_file_per_table = OFF
   

and restart MySQL. Then for this to work you'll need to dump your databases into SQL file (mysqldump), then drop and re-create the databases, then load the data back.

2. Change default ulimit value of OSX (suggested by Github user sodabrew): https://superuser.com/questions/261023/how-to-change-default-ulimit-values-in-mac-os-x-10-6

3. Add the following option to [mysqld] section of my.cnf: table_open_cache = 250. By default it is set to 2000, which is way above OSX's default ulimit. This solution is also not recommended, because it hurts the performance of your MySQL - it forces MySQL to re-open tables often, if you have more than 250 tables: https://mariadb.com/kb/en/optimizing-table_open_cache/

Why this error is happening?

Since MySQL 5.6 innodb_file_per_table option is ON by default, which means that each table's data is stored in its own file. OSX default limit of the number of the open files is 256 per process. Normally this isn't a problem, but in my case I'm running unit tests in parallel, which creates 8 databases with 405 tables each. OSX has a limit of the number of open file handles per process. This StackOverflow answer suggests that this limit is 256, which explains my problem perfectly: before MySQL 5.6 all data from all these 8 databases was in ONE file.

Thanks to my colleague Thomas L. who found a MySQL bug report which hinted this solution!

Answer 5

On Mavericks, this worked for me:

mysql.server stop
brew install mysql
mysql.server start
gem remove mysql2
gem install mysql2

I reinstalled Homebrew after upgrading to Mavericks. Homebrew installed the bottled version of MySQL 5.6.13.

Answer 6

What I found worked, was setting table_open_cache to a value no higher than 1000

table_open_cache=1000

I found this on the bug page, very last comment https://bugs.mysql.com/bug.php?id=71960