在标准MySQL 5.6上查询没有使用过的索引的SQL

select distinct
mysql.innodb_index_stats.table_name,
mysql.innodb_index_stats.index_name
from
mysql.innodb_index_stats
where
concat(mysql.innodb_index_stats.index_name,
mysql.innodb_index_stats.table_name) not in (select
concat(information_schema.statistics.index_name,
information_schema.statistics.table_name)
from
information_schema.statistics)
and mysql.innodb_index_stats.index_name <> 'GEN_CLUST_INDEX';