mysql> show variables like '%dir%';
+----------------------------+----------------------------+
| Variable_name | Value |
+----------------------------+----------------------------+
| basedir | / |
| character_sets_dir | /usr/share/mysql/charsets/ |
| datadir | /data/mysql/ |
| innodb_data_home_dir | |
| innodb_log_arch_dir | |
| innodb_log_group_home_dir | ./ |
| innodb_max_dirty_pages_pct | 90 |
| slave_load_tmpdir | /tmp/ |
| tmpdir | /tmp/ |
+----------------------------+----------------------------+