I know, what, MyISAM-only? Yes, it’s true, and it occurs more than you might think.
If you do run MyISAM-only, it’s common to have disabled InnoDB altogether (–skip-innodb) to avoid allocating any RAM to it, and to avoid unnecessary files required for backups, and so forth. (See this post if interested in disabling InnoDB in MySQL 5.6 and/or MariaDB 10.0.)
One improvement in MySQL 5.6 and MariaDB 10.0 is the addition of some system tables. The 2 that are in both are `innodb_table_stats` and `innodb_index_stats`, both of which have an engine type of InnoDB. (The 1 additional system table in MariaDB 10.0 is `gtid_slave_pos`, and the 3 additional system tables in MySQL 5.6 are `slave_master_info`, `slave_relay_log_info`, and `slave_worker_info`.)
The issue, with regards to running MyISAM-only, is that these new …[Read more]