SHOW TABLES FROM information_schema LIKE 'TABLES';
Tables_in_information_schema (TABLES)
TABLES
#######################################################################
# Testcase 3.2.1.1: INFORMATION_SCHEMA tables can be queried via SELECT
#######################################################################
DROP VIEW      IF EXISTS test.v1;
DROP PROCEDURE IF EXISTS test.p1;
DROP FUNCTION  IF EXISTS test.f1;
CREATE VIEW test.v1 AS     SELECT * FROM information_schema.TABLES;
CREATE PROCEDURE test.p1() SELECT * FROM information_schema.TABLES;
CREATE FUNCTION test.f1() returns BIGINT
BEGIN
DECLARE counter BIGINT DEFAULT NULL;
SELECT COUNT(*) INTO counter FROM information_schema.TABLES;
RETURN counter;
END//
# Attention: The printing of the next result sets is disabled.
SELECT * FROM information_schema.TABLES;
SELECT * FROM test.v1;
CALL test.p1;
SELECT test.f1();
DROP VIEW test.v1;
DROP PROCEDURE test.p1;
DROP FUNCTION test.f1;
#########################################################################
# Testcase 3.2.12.1: INFORMATION_SCHEMA.TABLES layout
#########################################################################
DESCRIBE          information_schema.TABLES;
Field	Type	Null	Key	Default	Extra
TABLE_CATALOG	varchar(512)	NO		NULL	
TABLE_SCHEMA	varchar(64)	NO		NULL	
TABLE_NAME	varchar(64)	NO		NULL	
TABLE_TYPE	varchar(64)	NO		NULL	
ENGINE	varchar(64)	YES		NULL	
VERSION	bigint(21) unsigned	YES		NULL	
ROW_FORMAT	varchar(10)	YES		NULL	
TABLE_ROWS	bigint(21) unsigned	YES		NULL	
AVG_ROW_LENGTH	bigint(21) unsigned	YES		NULL	
DATA_LENGTH	bigint(21) unsigned	YES		NULL	
MAX_DATA_LENGTH	bigint(21) unsigned	YES		NULL	
INDEX_LENGTH	bigint(21) unsigned	YES		NULL	
DATA_FREE	bigint(21) unsigned	YES		NULL	
AUTO_INCREMENT	bigint(21) unsigned	YES		NULL	
CREATE_TIME	datetime	YES		NULL	
UPDATE_TIME	datetime	YES		NULL	
CHECK_TIME	datetime	YES		NULL	
TABLE_COLLATION	varchar(64)	YES		NULL	
CHECKSUM	bigint(21) unsigned	YES		NULL	
CREATE_OPTIONS	varchar(2048)	YES		NULL	
TABLE_COMMENT	varchar(2048)	NO		NULL	
MAX_INDEX_LENGTH	bigint(21) unsigned	YES		NULL	
TEMPORARY	varchar(1)	YES		NULL	
SHOW CREATE TABLE information_schema.TABLES;
Table	Create Table
TABLES	CREATE TEMPORARY TABLE `TABLES` (
  `TABLE_CATALOG` varchar(512) NOT NULL,
  `TABLE_SCHEMA` varchar(64) NOT NULL,
  `TABLE_NAME` varchar(64) NOT NULL,
  `TABLE_TYPE` varchar(64) NOT NULL,
  `ENGINE` varchar(64),
  `VERSION` bigint(21) unsigned,
  `ROW_FORMAT` varchar(10),
  `TABLE_ROWS` bigint(21) unsigned,
  `AVG_ROW_LENGTH` bigint(21) unsigned,
  `DATA_LENGTH` bigint(21) unsigned,
  `MAX_DATA_LENGTH` bigint(21) unsigned,
  `INDEX_LENGTH` bigint(21) unsigned,
  `DATA_FREE` bigint(21) unsigned,
  `AUTO_INCREMENT` bigint(21) unsigned,
  `CREATE_TIME` datetime,
  `UPDATE_TIME` datetime,
  `CHECK_TIME` datetime,
  `TABLE_COLLATION` varchar(64),
  `CHECKSUM` bigint(21) unsigned,
  `CREATE_OPTIONS` varchar(2048),
  `TABLE_COMMENT` varchar(2048) NOT NULL,
  `MAX_INDEX_LENGTH` bigint(21) unsigned,
  `TEMPORARY` varchar(1)
) ENGINE=MEMORY DEFAULT CHARSET=utf8mb3 COLLATE=utf8mb3_general_ci
SHOW COLUMNS FROM information_schema.TABLES;
Field	Type	Null	Key	Default	Extra
TABLE_CATALOG	varchar(512)	NO		NULL	
TABLE_SCHEMA	varchar(64)	NO		NULL	
TABLE_NAME	varchar(64)	NO		NULL	
TABLE_TYPE	varchar(64)	NO		NULL	
ENGINE	varchar(64)	YES		NULL	
VERSION	bigint(21) unsigned	YES		NULL	
ROW_FORMAT	varchar(10)	YES		NULL	
TABLE_ROWS	bigint(21) unsigned	YES		NULL	
AVG_ROW_LENGTH	bigint(21) unsigned	YES		NULL	
DATA_LENGTH	bigint(21) unsigned	YES		NULL	
MAX_DATA_LENGTH	bigint(21) unsigned	YES		NULL	
INDEX_LENGTH	bigint(21) unsigned	YES		NULL	
DATA_FREE	bigint(21) unsigned	YES		NULL	
AUTO_INCREMENT	bigint(21) unsigned	YES		NULL	
CREATE_TIME	datetime	YES		NULL	
UPDATE_TIME	datetime	YES		NULL	
CHECK_TIME	datetime	YES		NULL	
TABLE_COLLATION	varchar(64)	YES		NULL	
CHECKSUM	bigint(21) unsigned	YES		NULL	
CREATE_OPTIONS	varchar(2048)	YES		NULL	
TABLE_COMMENT	varchar(2048)	NO		NULL	
MAX_INDEX_LENGTH	bigint(21) unsigned	YES		NULL	
TEMPORARY	varchar(1)	YES		NULL	
SELECT table_catalog, table_schema, table_name
FROM information_schema.tables WHERE table_catalog IS NULL OR table_catalog <> 'def';
table_catalog	table_schema	table_name
################################################################################
# Testcase 3.2.12.2 + 3.2.12.3: INFORMATION_SCHEMA.TABLES accessible information
################################################################################
DROP DATABASE IF EXISTS db_datadict;
CREATE DATABASE db_datadict;
DROP   USER 'testuser1'@'localhost';
CREATE USER 'testuser1'@'localhost';
GRANT CREATE, CREATE VIEW, INSERT, SELECT ON db_datadict.*
TO 'testuser1'@'localhost' WITH GRANT OPTION;
DROP   USER 'testuser2'@'localhost';
CREATE USER 'testuser2'@'localhost';
DROP   USER 'testuser3'@'localhost';
CREATE USER 'testuser3'@'localhost';
CREATE TABLE db_datadict.tb1 (f1 INT, f2 INT, f3 INT)
ENGINE = <engine_type>;
GRANT SELECT ON db_datadict.tb1 TO 'testuser1'@'localhost';
GRANT ALL    ON db_datadict.tb1 TO 'testuser2'@'localhost' WITH GRANT OPTION;
connect  testuser1, localhost, testuser1, , db_datadict;
CREATE TABLE tb2 (f1 DECIMAL)
ENGINE = <engine_type>;
CREATE TABLE tb3 (f1 VARCHAR(200))
ENGINE = <engine_type>;
GRANT SELECT ON db_datadict.tb3 to 'testuser3'@'localhost';
GRANT INSERT ON db_datadict.tb3 to 'testuser2'@'localhost';
CREATE VIEW v3 AS SELECT * FROM tb3;
GRANT SELECT ON db_datadict.v3 to 'testuser3'@'localhost';
SELECT * FROM information_schema.tables
WHERE table_schema = 'db_datadict' ORDER BY table_name;
TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	TABLE_TYPE	ENGINE	VERSION	ROW_FORMAT	TABLE_ROWS	AVG_ROW_LENGTH	DATA_LENGTH	MAX_DATA_LENGTH	INDEX_LENGTH	DATA_FREE	AUTO_INCREMENT	CREATE_TIME	UPDATE_TIME	CHECK_TIME	TABLE_COLLATION	CHECKSUM	CREATE_OPTIONS	TABLE_COMMENT	MAX_INDEX_LENGTH	TEMPORARY
def	db_datadict	tb1	BASE TABLE	#ENG#	10	#RF#	0	#ARL#	#DL#	#MDL#	#IL#	#DF#	NULL	#CRT	#UT#	#CT#	latin1_swedish_ci	#CS#			0	N
def	db_datadict	tb2	BASE TABLE	#ENG#	10	#RF#	0	#ARL#	#DL#	#MDL#	#IL#	#DF#	NULL	#CRT	#UT#	#CT#	latin1_swedish_ci	#CS#			0	N
def	db_datadict	tb3	BASE TABLE	#ENG#	10	#RF#	0	#ARL#	#DL#	#MDL#	#IL#	#DF#	NULL	#CRT	#UT#	#CT#	latin1_swedish_ci	#CS#			0	N
def	db_datadict	v3	VIEW	#ENG#	NULL	#RF#	NULL	#ARL#	#DL#	#MDL#	#IL#	#DF#	NULL	#CRT	#UT#	#CT#	NULL	#CS#	NULL	VIEW	NULL	NULL
SHOW TABLES FROM db_datadict;
Tables_in_db_datadict
tb1
tb2
tb3
v3
connect  testuser2, localhost, testuser2, , db_datadict;
SELECT * FROM information_schema.tables
WHERE table_schema = 'db_datadict' ORDER BY table_name;
TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	TABLE_TYPE	ENGINE	VERSION	ROW_FORMAT	TABLE_ROWS	AVG_ROW_LENGTH	DATA_LENGTH	MAX_DATA_LENGTH	INDEX_LENGTH	DATA_FREE	AUTO_INCREMENT	CREATE_TIME	UPDATE_TIME	CHECK_TIME	TABLE_COLLATION	CHECKSUM	CREATE_OPTIONS	TABLE_COMMENT	MAX_INDEX_LENGTH	TEMPORARY
def	db_datadict	tb1	BASE TABLE	#ENG#	10	#RF#	0	#ARL#	#DL#	#MDL#	#IL#	#DF#	NULL	#CRT	#UT#	#CT#	latin1_swedish_ci	#CS#			0	N
def	db_datadict	tb3	BASE TABLE	#ENG#	10	#RF#	0	#ARL#	#DL#	#MDL#	#IL#	#DF#	NULL	#CRT	#UT#	#CT#	latin1_swedish_ci	#CS#			0	N
SHOW TABLES FROM db_datadict;
Tables_in_db_datadict
tb1
tb3
connect  testuser3, localhost, testuser3, , db_datadict;
SELECT * FROM information_schema.tables
WHERE table_schema = 'db_datadict' ORDER BY table_name;
TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	TABLE_TYPE	ENGINE	VERSION	ROW_FORMAT	TABLE_ROWS	AVG_ROW_LENGTH	DATA_LENGTH	MAX_DATA_LENGTH	INDEX_LENGTH	DATA_FREE	AUTO_INCREMENT	CREATE_TIME	UPDATE_TIME	CHECK_TIME	TABLE_COLLATION	CHECKSUM	CREATE_OPTIONS	TABLE_COMMENT	MAX_INDEX_LENGTH	TEMPORARY
def	db_datadict	tb3	BASE TABLE	#ENG#	10	#RF#	0	#ARL#	#DL#	#MDL#	#IL#	#DF#	NULL	#CRT	#UT#	#CT#	latin1_swedish_ci	#CS#			0	N
def	db_datadict	v3	VIEW	#ENG#	NULL	#RF#	NULL	#ARL#	#DL#	#MDL#	#IL#	#DF#	NULL	#CRT	#UT#	#CT#	NULL	#CS#	NULL	VIEW	NULL	NULL
SHOW TABLES FROM db_datadict;
Tables_in_db_datadict
tb3
v3
connection default;
SELECT * FROM information_schema.tables
WHERE table_schema = 'db_datadict' ORDER BY table_name;
TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	TABLE_TYPE	ENGINE	VERSION	ROW_FORMAT	TABLE_ROWS	AVG_ROW_LENGTH	DATA_LENGTH	MAX_DATA_LENGTH	INDEX_LENGTH	DATA_FREE	AUTO_INCREMENT	CREATE_TIME	UPDATE_TIME	CHECK_TIME	TABLE_COLLATION	CHECKSUM	CREATE_OPTIONS	TABLE_COMMENT	MAX_INDEX_LENGTH	TEMPORARY
def	db_datadict	tb1	BASE TABLE	#ENG#	10	#RF#	0	#ARL#	#DL#	#MDL#	#IL#	#DF#	NULL	#CRT	#UT#	#CT#	latin1_swedish_ci	#CS#			0	N
def	db_datadict	tb2	BASE TABLE	#ENG#	10	#RF#	0	#ARL#	#DL#	#MDL#	#IL#	#DF#	NULL	#CRT	#UT#	#CT#	latin1_swedish_ci	#CS#			0	N
def	db_datadict	tb3	BASE TABLE	#ENG#	10	#RF#	0	#ARL#	#DL#	#MDL#	#IL#	#DF#	NULL	#CRT	#UT#	#CT#	latin1_swedish_ci	#CS#			0	N
def	db_datadict	v3	VIEW	#ENG#	NULL	#RF#	NULL	#ARL#	#DL#	#MDL#	#IL#	#DF#	NULL	#CRT	#UT#	#CT#	NULL	#CS#	NULL	VIEW	NULL	NULL
SHOW TABLES FROM db_datadict;
Tables_in_db_datadict
tb1
tb2
tb3
v3
disconnect testuser1;
disconnect testuser2;
disconnect testuser3;
DROP USER 'testuser1'@'localhost';
DROP USER 'testuser2'@'localhost';
DROP USER 'testuser3'@'localhost';
DROP DATABASE db_datadict;
#########################################################################
# 3.2.1.13+3.2.1.14+3.2.1.15: INFORMATION_SCHEMA.TABLES modifications
#########################################################################
DROP TABLE IF EXISTS test.t1_my_table;
DROP DATABASE IF EXISTS db_datadict;
CREATE DATABASE db_datadict;
SELECT table_name FROM information_schema.tables
WHERE table_name LIKE 't1_my_table%';
table_name
CREATE TABLE test.t1_my_table (f1 BIGINT)
DEFAULT CHARACTER SET latin1 COLLATE latin1_swedish_ci
COMMENT = 'Initial Comment' ENGINE = <engine_type>;
SELECT * FROM information_schema.tables
WHERE table_name = 't1_my_table';
TABLE_CATALOG	def
TABLE_SCHEMA	test
TABLE_NAME	t1_my_table
TABLE_TYPE	BASE TABLE
ENGINE	#ENG#
VERSION	10
ROW_FORMAT	#RF#
TABLE_ROWS	0
AVG_ROW_LENGTH	#ARL#
DATA_LENGTH	#DL#
MAX_DATA_LENGTH	#MDL#
INDEX_LENGTH	#IL#
DATA_FREE	#DF#
AUTO_INCREMENT	NULL
CREATE_TIME	#CRT
UPDATE_TIME	#UT#
CHECK_TIME	#CT#
TABLE_COLLATION	latin1_swedish_ci
CHECKSUM	#CS#
CREATE_OPTIONS	
TABLE_COMMENT	Initial Comment
MAX_INDEX_LENGTH	0
TEMPORARY	N
SELECT table_name FROM information_schema.tables
WHERE table_name LIKE 't1_my_table%';
table_name
t1_my_table
RENAME TABLE test.t1_my_table TO test.t1_my_tablex;
SELECT table_name FROM information_schema.tables
WHERE table_name LIKE 't1_my_table%';
table_name
t1_my_tablex
SELECT table_schema,table_name FROM information_schema.tables
WHERE table_name = 't1_my_tablex';
table_schema	table_name
test	t1_my_tablex
RENAME TABLE test.t1_my_tablex TO db_datadict.t1_my_tablex;
SELECT table_schema,table_name FROM information_schema.tables
WHERE table_name = 't1_my_tablex';
table_schema	table_name
db_datadict	t1_my_tablex
SELECT table_name, engine FROM information_schema.tables
WHERE table_name = 't1_my_tablex';
table_name	engine
t1_my_tablex	<engine_type>
ALTER TABLE db_datadict.t1_my_tablex
ENGINE = <other_engine_type>;
SELECT table_name, engine FROM information_schema.tables
WHERE table_name = 't1_my_tablex';
table_name	engine
t1_my_tablex	<other_engine_type>
SELECT table_name, table_rows FROM information_schema.tables
WHERE table_name = 't1_my_tablex';
table_name	table_rows
t1_my_tablex	0
INSERT INTO db_datadict.t1_my_tablex VALUES(1),(2);
SELECT table_name, table_rows FROM information_schema.tables
WHERE table_name = 't1_my_tablex';
table_name	table_rows
t1_my_tablex	2
SELECT table_name, table_collation FROM information_schema.tables
WHERE table_name = 't1_my_tablex';
table_name	table_collation
t1_my_tablex	latin1_swedish_ci
ALTER TABLE db_datadict.t1_my_tablex DEFAULT CHARACTER SET utf8;
SELECT table_name, table_collation FROM information_schema.tables
WHERE table_name = 't1_my_tablex';
table_name	table_collation
t1_my_tablex	utf8mb3_general_ci
SELECT table_name, table_collation FROM information_schema.tables
WHERE table_name = 't1_my_tablex';
table_name	table_collation
t1_my_tablex	utf8mb3_general_ci
ALTER TABLE db_datadict.t1_my_tablex
DEFAULT CHARACTER SET latin1 COLLATE latin1_german1_ci;
SELECT table_name, table_collation FROM information_schema.tables
WHERE table_name = 't1_my_tablex';
table_name	table_collation
t1_my_tablex	latin1_german1_ci
SELECT table_name, TABLE_COMMENT FROM information_schema.tables
WHERE table_name = 't1_my_tablex';
table_name	TABLE_COMMENT
t1_my_tablex	Initial Comment
ALTER TABLE db_datadict.t1_my_tablex COMMENT 'Changed Comment';
SELECT table_name, TABLE_COMMENT FROM information_schema.tables
WHERE table_name = 't1_my_tablex';
table_name	TABLE_COMMENT
t1_my_tablex	Changed Comment
SELECT table_name, AUTO_INCREMENT FROM information_schema.tables
WHERE table_name = 't1_my_tablex';
table_name	AUTO_INCREMENT
t1_my_tablex	NULL
ALTER TABLE db_datadict.t1_my_tablex
ADD f2 BIGINT AUTO_INCREMENT, ADD PRIMARY KEY (f2);
SELECT table_name, AUTO_INCREMENT FROM information_schema.tables
WHERE table_name = 't1_my_tablex';
table_name	AUTO_INCREMENT
t1_my_tablex	3
SELECT table_name, ROW_FORMAT FROM information_schema.tables
WHERE table_name = 't1_my_tablex';
table_name	ROW_FORMAT
t1_my_tablex	Fixed
ALTER TABLE db_datadict.t1_my_tablex ROW_FORMAT = dynamic;
SELECT table_name, ROW_FORMAT FROM information_schema.tables
WHERE table_name = 't1_my_tablex';
table_name	ROW_FORMAT
t1_my_tablex	Dynamic
SELECT table_name, checksum FROM information_schema.tables
WHERE table_name = 't1_my_tablex';
table_name	checksum
t1_my_tablex	NULL
ALTER TABLE db_datadict.t1_my_tablex CHECKSUM = 1;
SELECT table_name, checksum IS NOT NULL FROM information_schema.tables
WHERE table_name = 't1_my_tablex';
table_name	checksum IS NOT NULL
t1_my_tablex	1
SELECT UPDATE_TIME, checksum INTO @UPDATE_TIME, @checksum
FROM information_schema.tables
WHERE table_name = 't1_my_tablex';
INSERT INTO db_datadict.t1_my_tablex SET f1 = 3;
FLUSH TABLES;
SELECT UPDATE_TIME > @UPDATE_TIME
AS "Is current UPDATE_TIME bigger than before last INSERT?"
FROM information_schema.tables
WHERE table_name = 't1_my_tablex';
Is current UPDATE_TIME bigger than before last INSERT?
1
SELECT checksum <> @checksum
AS "Is current CHECKSUM different than before last INSERT?"
FROM information_schema.tables
WHERE table_name = 't1_my_tablex';
Is current CHECKSUM different than before last INSERT?
1
SELECT CREATE_TIME INTO @CREATE_TIME FROM information_schema.tables
WHERE table_name = 't1_my_tablex';
SELECT table_name FROM information_schema.tables
WHERE table_name LIKE 't1_my_table%';
table_name
t1_my_tablex
DROP TABLE db_datadict.t1_my_tablex;
SELECT table_name FROM information_schema.tables
WHERE table_name LIKE 't1_my_table%';
table_name
CREATE TABLE test.t1_my_tablex (f1 BIGINT)
ENGINE = <other_engine_type>;
SELECT CREATE_TIME > @CREATE_TIME
AS "Is current CREATE_TIME bigger than for the old dropped table?"
FROM information_schema.tables
WHERE table_name = 't1_my_tablex';
Is current CREATE_TIME bigger than for the old dropped table?
1
DROP TABLE test.t1_my_tablex;
CREATE VIEW test.t1_my_tablex AS SELECT 1;
SELECT * FROM information_schema.tables
WHERE table_name = 't1_my_tablex';
TABLE_CATALOG	def
TABLE_SCHEMA	test
TABLE_NAME	t1_my_tablex
TABLE_TYPE	VIEW
ENGINE	NULL
VERSION	NULL
ROW_FORMAT	NULL
TABLE_ROWS	NULL
AVG_ROW_LENGTH	NULL
DATA_LENGTH	NULL
MAX_DATA_LENGTH	NULL
INDEX_LENGTH	NULL
DATA_FREE	NULL
AUTO_INCREMENT	NULL
CREATE_TIME	NULL
UPDATE_TIME	NULL
CHECK_TIME	NULL
TABLE_COLLATION	NULL
CHECKSUM	NULL
CREATE_OPTIONS	NULL
TABLE_COMMENT	VIEW
MAX_INDEX_LENGTH	NULL
TEMPORARY	NULL
DROP VIEW test.t1_my_tablex;
SELECT table_name FROM information_schema.tables
WHERE table_name = 't1_my_tablex';
table_name
CREATE TEMPORARY TABLE test.t1_my_tablex
ENGINE = <other_engine_type>
AS SELECT 1;
SELECT table_name, table_type FROM information_schema.tables
WHERE table_name = 't1_my_tablex';
DROP TEMPORARY TABLE test.t1_my_tablex;
CREATE TABLE db_datadict.t1_my_tablex
ENGINE = <engine_type> AS
SELECT 1;
SELECT table_name FROM information_schema.tables
WHERE table_name = 't1_my_tablex';
table_name
t1_my_tablex
DROP DATABASE db_datadict;
SELECT table_name FROM information_schema.tables
WHERE table_name = 't1_my_tablex';
table_name
########################################################################
# Testcases 3.2.1.3-3.2.1.5 + 3.2.1.8-3.2.1.12: INSERT/UPDATE/DELETE and
#           DDL on INFORMATION_SCHEMA tables are not supported
########################################################################
DROP DATABASE IF EXISTS db_datadict;
CREATE DATABASE db_datadict;
CREATE TABLE db_datadict.t1 (f1 BIGINT)
ENGINE = <engine_type>;
INSERT INTO information_schema.tables
SELECT * FROM information_schema.tables;
ERROR 42000: Access denied for user 'root'@'localhost' to database 'information_schema'
UPDATE information_schema.tables SET table_schema = 'test'
WHERE table_name = 't1';
Got one of the listed errors
DELETE FROM information_schema.tables WHERE table_name = 't1';
ERROR 42000: Access denied for user 'root'@'localhost' to database 'information_schema'
TRUNCATE information_schema.tables;
ERROR 42000: Access denied for user 'root'@'localhost' to database 'information_schema'
CREATE INDEX my_idx_on_tables ON information_schema.tables(table_schema);
ERROR 42000: Access denied for user 'root'@'localhost' to database 'information_schema'
ALTER TABLE information_schema.tables DROP PRIMARY KEY;
ERROR 42000: Access denied for user 'root'@'localhost' to database 'information_schema'
ALTER TABLE information_schema.tables ADD f1 INT;
ERROR 42000: Access denied for user 'root'@'localhost' to database 'information_schema'
DROP TABLE information_schema.tables;
ERROR 42000: Access denied for user 'root'@'localhost' to database 'information_schema'
ALTER TABLE information_schema.tables RENAME db_datadict.tables;
ERROR 42000: Access denied for user 'root'@'localhost' to database 'information_schema'
ALTER TABLE information_schema.tables RENAME information_schema.xtables;
ERROR 42000: Access denied for user 'root'@'localhost' to database 'information_schema'
DROP DATABASE db_datadict;