select @@global.innodb_log_compressed_pages into @save_innodb_log_compressed_pages;
SET @@global.innodb_log_compressed_pages=1;
SET GLOBAL innodb_cmp_per_index_enabled=ON;
SELECT * FROM information_schema.innodb_cmp_per_index;
CREATE TABLE t (
a INT,
b VARCHAR(512),
c VARCHAR(16),
PRIMARY KEY (a),
INDEX (b(512)),
INDEX (c(16))
) charset latin1 ENGINE=INNODB KEY_BLOCK_SIZE=2;
SELECT
database_name,
table_name,
index_name,
compress_ops,
compress_ops_ok,
uncompress_ops
FROM information_schema.innodb_cmp_per_index
ORDER BY 1, 2, 3;
database_name	test
table_name	t
index_name	b
compress_ops	1
compress_ops_ok	1
uncompress_ops	0
database_name	test
table_name	t
index_name	c
compress_ops	1
compress_ops_ok	1
uncompress_ops	0
database_name	test
table_name	t
index_name	PRIMARY
compress_ops	1
compress_ops_ok	1
uncompress_ops	0
BEGIN;
COMMIT;
ALTER TABLE t DROP INDEX c;
CREATE USER 'tuser01'@'localhost' IDENTIFIED BY 'cDJvI9s_Uq';
FLUSH PRIVILEGES;
SELECT * FROM information_schema.innodb_cmp_per_index;
ERROR 42000: Access denied; you need (at least one of) the PROCESS privilege(s) for this operation
DROP USER 'tuser01'@'localhost';
SELECT
database_name,
table_name,
index_name,
CASE WHEN compress_ops=47 and @@innodb_compression_level IN (4,8,9) THEN 65
ELSE compress_ops END as compress_ops,
CASE WHEN compress_ops_ok=47 and @@innodb_compression_level IN (4,8,9) THEN 65
ELSE compress_ops_ok END as compress_ops_ok,
uncompress_ops
FROM information_schema.innodb_cmp_per_index
ORDER BY 1, 2, 3;
database_name	test
table_name	t
index_name	b
compress_ops	43
compress_ops_ok	43
uncompress_ops	0
database_name	test
table_name	t
index_name	PRIMARY
compress_ops	80
compress_ops_ok	80
uncompress_ops	0
SET GLOBAL innodb_log_compressed_pages=@save_innodb_log_compressed_pages;
DROP TABLE t;
SET GLOBAL innodb_cmp_per_index_enabled=default;