On 10/16/2014 6:51 AM, Mark Rosedale wrote:
I went through your ask post. This was extremely helpful information.
However, I wanted to add some updated information about reclaiming your
space the hard way.

According to the mysql documentation
<http://dev.mysql.com/doc/refman/5.6/en/tablespace-enabling.html> you
can change the innodb_file_per_table setting and then run the following
command to split the table off into its own file.

I wasn't aware that it was that easy to break tables out. That appears to be a 5.5+ feature based on docs, but maybe I just can't find the reference to it in earlier versions. At first glance this looked like a very simple way to solve the problem. However it will reclaim space in the manner you're expecting. The problem is that space in the system idbata files is never reclaimed. If you've allowed your Dashboard db to grow to 80GB without innodb_file_per_table when you create the new table with this method the new table will be the size of the data which is what we expect because it was created new. Unfortunately the system ibdata files will still be 80GB.

http://dev.mysql.com/doc/refman/5.6/en/glossary.html#glos_system_tablespace

Ramin

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