call mtr.add_suppression("mysql.concurrency_control");
create database ccl_db;
create table ccl_db.t1(id int, name varchar(100));
create user 'u0'@'%';
grant all privileges on *.* to 'u0'@'%';
create user 'u1'@'%';
grant all privileges on ccl_db.* to 'u1'@'%';
grant all privileges on mysql.* to 'u1'@'%';
show create table mysql.concurrency_control;
Table	Create Table
concurrency_control	CREATE TABLE `concurrency_control` (
  `Id` bigint(20) NOT NULL AUTO_INCREMENT,
  `Type` enum('SELECT','UPDATE','INSERT','DELETE') CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL DEFAULT 'SELECT',
  `Schema_name` varchar(64) COLLATE utf8_bin DEFAULT NULL,
  `Table_name` varchar(64) COLLATE utf8_bin DEFAULT NULL,
  `Concurrency_count` bigint(20) NOT NULL,
  `Keywords` text COLLATE utf8_bin,
  `State` enum('N','Y') CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL DEFAULT 'Y',
  `Ordered` enum('N','Y') CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL DEFAULT 'N',
  PRIMARY KEY (`Id`)
) /*!50100 TABLESPACE `mysql` */ ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin STATS_PERSISTENT=0 COMMENT='Concurrency control'
2.1 check privileges
call dbms_ccl.add_ccl_rule("SELECT", "mysql", "user", 10, "key1;key2;key3");
call dbms_ccl.show_ccl_rule();
ID	TYPE	SCHEMA	TABLE	STATE	ORDER	CONCURRENCY_COUNT	MATCHED	RUNNING	WAITTING	KEYWORDS
#	SELECT	mysql	user	Y	N	10	0	0	0	key1;key2;key3
call dbms_ccl.flush_ccl_rule();
call dbms_ccl.del_ccl_rule(1);
call dbms_ccl.show_ccl_rule();
ID	TYPE	SCHEMA	TABLE	STATE	ORDER	CONCURRENCY_COUNT	MATCHED	RUNNING	WAITTING	KEYWORDS
2.2 test the parameters
call dbms_ccl.add_ccl_rule("ccl_db", "t1", 10, "key1;key2;key3");
ERROR 42000: Incorrect number of arguments for PROCEDURE dbms_ccl.add_ccl_rule; expected 5, got 4
call dbms_ccl.add_ccl_rule("ccl_db", 10, 10, "key1;key2;key3");
ERROR 42000: Incorrect number of arguments for PROCEDURE dbms_ccl.add_ccl_rule; expected 5, got 4
call dbms_ccl.add_ccl_rule(10, "ccl_db", 10, 10, "key1;key2;key3");
ERROR HY000: The 1th parameter didn't match for native procedure dbms_ccl.add_ccl_rule
call dbms_ccl.add_ccl_rule("select", "ccl_db", "", 10, "key1;key2;key3");
ERROR HY000: Concurrency control rule 0 is not valid when add rule
call dbms_ccl.add_ccl_rule("select", "", "t1", 10, "key1;key2;key3");
ERROR HY000: Concurrency control rule 0 is not valid when add rule
call dbms_ccl.add_ccl_rule("xxxx", "", "t1", 10, "key1;key2;key3");
ERROR HY000: Concurrency control rule 0 is not valid when add rule
call dbms_ccl.add_ccl_rule("", "ccl_db", "t1", 10, "key1;key2;key3");
ERROR HY000: Concurrency control rule 0 is not valid when add rule
call dbms_ccl.add_ccl_rule("select", "ccl_db",
"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxpchild", 10, "key1;key2;key3");
call dbms_ccl.add_ccl_rule("select", "ccl_db", "t1", 10, "key1;key2;key3");
call dbms_ccl.show_ccl_rule();
ID	TYPE	SCHEMA	TABLE	STATE	ORDER	CONCURRENCY_COUNT	MATCHED	RUNNING	WAITTING	KEYWORDS
#	SELECT	ccl_db	t1	Y	N	10	0	0	0	key1;key2;key3
#	SELECT	ccl_db	xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxpchild	Y	N	10	0	0	0	key1;key2;key3
select * from mysql.concurrency_control;
Id	Type	Schema_name	Table_name	Concurrency_count	Keywords	State	Ordered
#	SELECT	ccl_db	xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx	10	key1;key2;key3	Y	N
#	SELECT	ccl_db	t1	10	key1;key2;key3	Y	N
delete from mysql.concurrency_control;
commit;
call dbms_ccl.flush_ccl_rule();
call dbms_ccl.show_ccl_rule();
ID	TYPE	SCHEMA	TABLE	STATE	ORDER	CONCURRENCY_COUNT	MATCHED	RUNNING	WAITTING	KEYWORDS
select * from mysql.concurrency_control;
Id	Type	Schema_name	Table_name	Concurrency_count	Keywords	State	Ordered
2.3 test the ccl table error.
alter table mysql.concurrency_control add col1 int;
call dbms_ccl.add_ccl_rule("select", "ccl_db", "t1", 10, "key1;key2;key3");
ERROR HY000: Cannot load from mysql.concurrency_control. The table is probably corrupted
call dbms_ccl.del_ccl_rule(1);
ERROR HY000: Cannot load from mysql.concurrency_control. The table is probably corrupted
call dbms_ccl.flush_ccl_rule();
ERROR HY000: Cannot load from mysql.concurrency_control. The table is probably corrupted
call dbms_ccl.show_ccl_rule();
ID	TYPE	SCHEMA	TABLE	STATE	ORDER	CONCURRENCY_COUNT	MATCHED	RUNNING	WAITTING	KEYWORDS
alter table mysql.concurrency_control drop column col1;
2.4 test delete warning
call dbms_ccl.del_ccl_rule(1234567);
Warnings:
Warning	7526	Concurrency control rule 1234567 is not found in table
Warning	7526	Concurrency control rule 1234567 is not found in cache
2.5 test rule conflicit
call dbms_ccl.add_ccl_rule("select", "", "", 10, "");
call dbms_ccl.show_ccl_rule();
ID	TYPE	SCHEMA	TABLE	STATE	ORDER	CONCURRENCY_COUNT	MATCHED	RUNNING	WAITTING	KEYWORDS
#	SELECT			Y	N	10	0	0	0	
call dbms_ccl.add_ccl_rule("select", "", "", 11, "");
ERROR HY000: Concurrency control rule 5 is duplicate when load command rule
call dbms_ccl.show_ccl_rule();
ID	TYPE	SCHEMA	TABLE	STATE	ORDER	CONCURRENCY_COUNT	MATCHED	RUNNING	WAITTING	KEYWORDS
#	SELECT			Y	N	10	0	0	0	
call dbms_ccl.add_ccl_rule("select", "ccl_db", "t1", 10, "");
call dbms_ccl.add_ccl_rule("update", "ccl_db", "t1", 10, "");
call dbms_ccl.add_ccl_rule("insert", "ccl_db", "t1", 10, "");
call dbms_ccl.add_ccl_rule("delete", "ccl_db", "t1", 10, "");
call dbms_ccl.add_ccl_rule("select", "ccl_db", "t1", 11, "");
ERROR HY000: Concurrency control rule 10 is duplicate when load intact rule
call dbms_ccl.add_ccl_rule("select", "", "", 10, "key1");
call dbms_ccl.add_ccl_rule("select", "", "", 10, "key2");
call dbms_ccl.show_ccl_rule();
ID	TYPE	SCHEMA	TABLE	STATE	ORDER	CONCURRENCY_COUNT	MATCHED	RUNNING	WAITTING	KEYWORDS
#	SELECT	ccl_db	t1	Y	N	10	0	0	0	
#	SELECT			Y	N	10	0	0	0	key1
#	SELECT			Y	N	10	0	0	0	key2
#	SELECT			Y	N	10	0	0	0	
#	UPDATE	ccl_db	t1	Y	N	10	0	0	0	
#	INSERT	ccl_db	t1	Y	N	10	0	0	0	
#	DELETE	ccl_db	t1	Y	N	10	0	0	0	
delete from mysql.concurrency_control;
commit;
call dbms_ccl.flush_ccl_rule();
call dbms_ccl.show_ccl_rule();
ID	TYPE	SCHEMA	TABLE	STATE	ORDER	CONCURRENCY_COUNT	MATCHED	RUNNING	WAITTING	KEYWORDS
3 test the rule match
call dbms_ccl.add_ccl_rule("select", "", "", 10, "");
call dbms_ccl.show_ccl_rule();
ID	TYPE	SCHEMA	TABLE	STATE	ORDER	CONCURRENCY_COUNT	MATCHED	RUNNING	WAITTING	KEYWORDS
#	SELECT			Y	N	10	0	0	0	
select "key";
key
key
call dbms_ccl.show_ccl_rule();
ID	TYPE	SCHEMA	TABLE	STATE	ORDER	CONCURRENCY_COUNT	MATCHED	RUNNING	WAITTING	KEYWORDS
#	SELECT			Y	N	10	1	0	0	
call dbms_ccl.add_ccl_rule("select", "ccl_db", "t1", 10, "");
call dbms_ccl.show_ccl_rule();
ID	TYPE	SCHEMA	TABLE	STATE	ORDER	CONCURRENCY_COUNT	MATCHED	RUNNING	WAITTING	KEYWORDS
#	SELECT	ccl_db	t1	Y	N	10	0	0	0	
#	SELECT			Y	N	10	1	0	0	
select "key" from ccl_db.t1;
key
call dbms_ccl.show_ccl_rule();
ID	TYPE	SCHEMA	TABLE	STATE	ORDER	CONCURRENCY_COUNT	MATCHED	RUNNING	WAITTING	KEYWORDS
#	SELECT	ccl_db	t1	Y	N	10	1	0	0	
#	SELECT			Y	N	10	1	0	0	
delete from mysql.concurrency_control;
commit;
call dbms_ccl.flush_ccl_rule();
call dbms_ccl.add_ccl_rule("select", "ccl_db", "t1", 20, "");
call dbms_ccl.add_ccl_rule("select", "", "", 20, "key");
call dbms_ccl.show_ccl_rule();
ID	TYPE	SCHEMA	TABLE	STATE	ORDER	CONCURRENCY_COUNT	MATCHED	RUNNING	WAITTING	KEYWORDS
#	SELECT	ccl_db	t1	Y	N	20	0	0	0	
#	SELECT			Y	N	20	0	0	0	key
select "key" from ccl_db.t1;
key
call dbms_ccl.show_ccl_rule();
ID	TYPE	SCHEMA	TABLE	STATE	ORDER	CONCURRENCY_COUNT	MATCHED	RUNNING	WAITTING	KEYWORDS
#	SELECT	ccl_db	t1	Y	N	20	1	0	0	
#	SELECT			Y	N	20	0	0	0	key
call dbms_ccl.show_ccl_rule();
ID	TYPE	SCHEMA	TABLE	STATE	ORDER	CONCURRENCY_COUNT	MATCHED	RUNNING	WAITTING	KEYWORDS
#	SELECT	ccl_db	t1	Y	N	20	1	0	0	
#	SELECT			Y	N	20	0	0	0	key
select "key";
key
key
call dbms_ccl.show_ccl_rule();
ID	TYPE	SCHEMA	TABLE	STATE	ORDER	CONCURRENCY_COUNT	MATCHED	RUNNING	WAITTING	KEYWORDS
#	SELECT	ccl_db	t1	Y	N	20	1	0	0	
#	SELECT			Y	N	20	1	0	0	key
delete from mysql.concurrency_control;
commit;
call dbms_ccl.flush_ccl_rule();
4 test keywords
call dbms_ccl.add_ccl_rule("select", "ccl_db", "t1", 30, "");
call dbms_ccl.add_ccl_rule("select", "", "", 30, "key1;key2;key3");
select "key1key2" from ccl_db.t1;
key1key2
select "key1key2key3";
key1key2key3
key1key2key3
select "key1 key2 key3";
key1 key2 key3
key1 key2 key3
select "key2 key1 key3";
key2 key1 key3
key2 key1 key3
call dbms_ccl.show_ccl_rule();
ID	TYPE	SCHEMA	TABLE	STATE	ORDER	CONCURRENCY_COUNT	MATCHED	RUNNING	WAITTING	KEYWORDS
#	SELECT	ccl_db	t1	Y	N	30	1	0	0	
#	SELECT			Y	N	30	3	0	0	key1;key2;key3
update mysql.concurrency_control set ordered = 'Y' where keywords="key1;key2;key3";
commit;
call dbms_ccl.flush_ccl_rule();
call dbms_ccl.show_ccl_rule();
ID	TYPE	SCHEMA	TABLE	STATE	ORDER	CONCURRENCY_COUNT	MATCHED	RUNNING	WAITTING	KEYWORDS
#	SELECT	ccl_db	t1	Y	N	30	0	0	0	
#	SELECT			Y	Y	30	0	0	0	key1;key2;key3
select "key1key2key3";
key1key2key3
key1key2key3
select "key1 key2 key3";
key1 key2 key3
key1 key2 key3
select "key2 key1 key3";
key2 key1 key3
key2 key1 key3
call dbms_ccl.show_ccl_rule();
ID	TYPE	SCHEMA	TABLE	STATE	ORDER	CONCURRENCY_COUNT	MATCHED	RUNNING	WAITTING	KEYWORDS
#	SELECT	ccl_db	t1	Y	N	30	0	0	0	
#	SELECT			Y	Y	30	2	0	0	key1;key2;key3
test 5 insert case
delete from mysql.concurrency_control;
commit;
call dbms_ccl.flush_ccl_rule();
call dbms_ccl.add_ccl_rule("insert", "ccl_db", "t1", 40, "");
insert into ccl_db.t1 values(1, 'xpchild');
commit;
call dbms_ccl.show_ccl_rule();
ID	TYPE	SCHEMA	TABLE	STATE	ORDER	CONCURRENCY_COUNT	MATCHED	RUNNING	WAITTING	KEYWORDS
#	INSERT	ccl_db	t1	Y	N	40	1	0	0	
delete from mysql.concurrency_control;
commit;
call dbms_ccl.flush_ccl_rule();
call dbms_ccl.add_ccl_rule("insert", "", "", 50, "");
insert into ccl_db.t1 values(1, 'xpchild');
commit;
call dbms_ccl.show_ccl_rule();
ID	TYPE	SCHEMA	TABLE	STATE	ORDER	CONCURRENCY_COUNT	MATCHED	RUNNING	WAITTING	KEYWORDS
#	INSERT			Y	N	50	1	0	0	
delete from mysql.concurrency_control;
commit;
call dbms_ccl.flush_ccl_rule();
call dbms_ccl.add_ccl_rule("insert", "", "", 60, "xpchild");
insert into ccl_db.t1 values(1, 'xpchild');
commit;
call dbms_ccl.show_ccl_rule();
ID	TYPE	SCHEMA	TABLE	STATE	ORDER	CONCURRENCY_COUNT	MATCHED	RUNNING	WAITTING	KEYWORDS
#	INSERT			Y	N	60	1	0	0	xpchild
delete from mysql.concurrency_control;
commit;
call dbms_ccl.flush_ccl_rule();
call dbms_ccl.show_ccl_rule();
ID	TYPE	SCHEMA	TABLE	STATE	ORDER	CONCURRENCY_COUNT	MATCHED	RUNNING	WAITTING	KEYWORDS
test update case
delete from mysql.concurrency_control;
commit;
call dbms_ccl.flush_ccl_rule();
call dbms_ccl.add_ccl_rule("update", "ccl_db", "t1", 70, "");
update ccl_db.t1 set name = 'xpchild' where id = 1;
commit;
call dbms_ccl.show_ccl_rule();
ID	TYPE	SCHEMA	TABLE	STATE	ORDER	CONCURRENCY_COUNT	MATCHED	RUNNING	WAITTING	KEYWORDS
#	UPDATE	ccl_db	t1	Y	N	70	1	0	0	
delete from mysql.concurrency_control;
commit;
call dbms_ccl.flush_ccl_rule();
call dbms_ccl.add_ccl_rule("update", "", "", 80, "");
update ccl_db.t1 set name = 'xpchild' where id = 1;
commit;
call dbms_ccl.show_ccl_rule();
ID	TYPE	SCHEMA	TABLE	STATE	ORDER	CONCURRENCY_COUNT	MATCHED	RUNNING	WAITTING	KEYWORDS
#	UPDATE			Y	N	80	1	0	0	
delete from mysql.concurrency_control;
commit;
call dbms_ccl.flush_ccl_rule();
call dbms_ccl.add_ccl_rule("update", "", "", 90, "xpchild");
update ccl_db.t1 set name = 'xpchild' where id = 1;
commit;
call dbms_ccl.show_ccl_rule();
ID	TYPE	SCHEMA	TABLE	STATE	ORDER	CONCURRENCY_COUNT	MATCHED	RUNNING	WAITTING	KEYWORDS
#	UPDATE			Y	N	90	1	0	0	xpchild
delete from mysql.concurrency_control;
commit;
call dbms_ccl.flush_ccl_rule();
call dbms_ccl.show_ccl_rule();
ID	TYPE	SCHEMA	TABLE	STATE	ORDER	CONCURRENCY_COUNT	MATCHED	RUNNING	WAITTING	KEYWORDS
test delete case
delete from mysql.concurrency_control;
commit;
call dbms_ccl.flush_ccl_rule();
call dbms_ccl.add_ccl_rule("delete", "ccl_db", "t1", 100, "");
delete from ccl_db.t1 where name = 'xpchild';
commit;
call dbms_ccl.show_ccl_rule();
ID	TYPE	SCHEMA	TABLE	STATE	ORDER	CONCURRENCY_COUNT	MATCHED	RUNNING	WAITTING	KEYWORDS
#	DELETE	ccl_db	t1	Y	N	100	1	0	0	
delete from mysql.concurrency_control;
commit;
call dbms_ccl.flush_ccl_rule();
call dbms_ccl.add_ccl_rule("delete", "", "", 110, "");
delete from ccl_db.t1 where name = 'xpchild';
commit;
call dbms_ccl.show_ccl_rule();
ID	TYPE	SCHEMA	TABLE	STATE	ORDER	CONCURRENCY_COUNT	MATCHED	RUNNING	WAITTING	KEYWORDS
#	DELETE			Y	N	110	1	0	0	
delete from mysql.concurrency_control;
commit;
call dbms_ccl.flush_ccl_rule();
call dbms_ccl.add_ccl_rule("delete", "", "", 120, "xpchild");
delete from ccl_db.t1 where name = 'xpchild';
commit;
call dbms_ccl.show_ccl_rule();
ID	TYPE	SCHEMA	TABLE	STATE	ORDER	CONCURRENCY_COUNT	MATCHED	RUNNING	WAITTING	KEYWORDS
#	DELETE			Y	N	120	1	0	0	xpchild
delete from mysql.concurrency_control;
commit;
call dbms_ccl.flush_ccl_rule();
call dbms_ccl.show_ccl_rule();
ID	TYPE	SCHEMA	TABLE	STATE	ORDER	CONCURRENCY_COUNT	MATCHED	RUNNING	WAITTING	KEYWORDS
test concurrent case and threads_running
call dbms_ccl.add_ccl_rule('select', 'ccl_db', 't1', 1, '');
call dbms_ccl.show_ccl_rule();
ID	TYPE	SCHEMA	TABLE	STATE	ORDER	CONCURRENCY_COUNT	MATCHED	RUNNING	WAITTING	KEYWORDS
#	SELECT	ccl_db	t1	Y	N	1	5	0	0	
delete from mysql.concurrency_control;
commit;
call dbms_ccl.flush_ccl_rule();
call dbms_ccl.add_ccl_rule("select", "", "", 1, "");
call dbms_ccl.show_ccl_rule();
ID	TYPE	SCHEMA	TABLE	STATE	ORDER	CONCURRENCY_COUNT	MATCHED	RUNNING	WAITTING	KEYWORDS
#	SELECT			Y	N	1	0	0	0	
select 1 from dual;
1
1
create procedure proc_1() flush status;
create function func_1() returns int begin call proc_1(); return 1; end|
select func_1() from dual;
ERROR 0A000: FLUSH is not allowed in stored function or trigger
delete from mysql.concurrency_control;
commit;
call dbms_ccl.flush_ccl_rule();
call dbms_ccl.add_ccl_rule('select', 'ccl_db', 't1', 1, '');
delete from mysql.concurrency_control;
commit;
call dbms_ccl.flush_ccl_rule();
create table ccl_db.t2(id int, name varchar(100));
create table ccl_db.t3(id int, name varchar(100));
call dbms_ccl.add_ccl_rule("select", "ccl_db", "t1", 0, "");
call dbms_ccl.add_ccl_rule("select", "ccl_db", "t2", 0, "id");
call dbms_ccl.add_ccl_rule("select", "", "", 0, "name");
call dbms_ccl.add_ccl_rule("select", "", "", 0, "");
call dbms_ccl.show_ccl_rule();
ID	TYPE	SCHEMA	TABLE	STATE	ORDER	CONCURRENCY_COUNT	MATCHED	RUNNING	WAITTING	KEYWORDS
#	SELECT	ccl_db	t2	Y	N	0	0	0	0	id
#	SELECT	ccl_db	t1	Y	N	0	0	0	0	
#	SELECT			Y	N	0	0	0	0	name
#	SELECT			Y	N	0	0	0	0	
select * from ccl_db.t1 limit 1;
ERROR HY000: Concurrency control refuse to execute query
select * from ccl_db.t2 limit 1;
ERROR HY000: Concurrency control refuse to execute query
select * from ccl_db.t2 where id = 1;
ERROR HY000: Concurrency control refuse to execute query
select * from ccl_db.t3;
ERROR HY000: Concurrency control refuse to execute query
select func_1() from dual;
ERROR HY000: Concurrency control refuse to execute query
call proc_1();
call dbms_ccl.show_ccl_rule();
ID	TYPE	SCHEMA	TABLE	STATE	ORDER	CONCURRENCY_COUNT	MATCHED	RUNNING	WAITTING	KEYWORDS
#	SELECT	ccl_db	t2	Y	N	0	1	0	0	id
#	SELECT	ccl_db	t1	Y	N	0	1	0	0	
#	SELECT			Y	N	0	0	0	0	name
#	SELECT			Y	N	0	3	0	0	
delete from mysql.concurrency_control;
commit;
call dbms_ccl.flush_ccl_rule();
delete from mysql.concurrency_control;
commit;
call dbms_ccl.flush_ccl_rule();
call dbms_ccl.add_ccl_rule("select", "ccl_db", "t1", 0, "");
select * from ccl_db.t1 where id in (select id from ccl_db.t2);
ERROR HY000: Concurrency control refuse to execute query
select * from ccl_db.t2 where id in (select id from ccl_db.t1);
ERROR HY000: Concurrency control refuse to execute query
select * from ccl_db.t1 union select * from ccl_db.t2;
ERROR HY000: Concurrency control refuse to execute query
select * from ccl_db.t2 limit 1;
id	name
call dbms_ccl.show_ccl_rule();
ID	TYPE	SCHEMA	TABLE	STATE	ORDER	CONCURRENCY_COUNT	MATCHED	RUNNING	WAITTING	KEYWORDS
#	SELECT	ccl_db	t1	Y	N	0	3	0	0	
delete from mysql.concurrency_control;
commit;
call dbms_ccl.flush_ccl_rule();
drop function func_1;
drop procedure proc_1;
drop database ccl_db;
drop user 'u0'@'%';
drop user 'u1'@'%';