CREATE TABLE test_cached_indexes (
a INT,
b INT,
c INT,
PRIMARY KEY (a),
KEY `index_on_b` (b),
KEY `index_on_bc` (b, c)
) ENGINE=INNODB;
SELECT
tables.name AS table_name,
indexes.name AS index_name,
cached.n_cached_pages AS n_cached_pages
FROM
information_schema.innodb_cached_indexes AS cached,
information_schema.innodb_indexes AS indexes,
information_schema.innodb_tables AS tables
WHERE
cached.index_id = indexes.index_id
AND cached.space_id = indexes.space
AND indexes.table_id = tables.table_id
AND tables.name LIKE '%test_cached_indexes' -- remove this line to see all cached indexes
ORDER BY 1, 2, 3;
table_name	index_name	n_cached_pages
test/test_cached_indexes	index_on_b	1
test/test_cached_indexes	index_on_bc	1
test/test_cached_indexes	PRIMARY	1
DROP TABLE test_cached_indexes;