select * from performance_schema.setup_actors;
HOST	USER	ROLE
%	%	%
truncate table performance_schema.setup_actors;
insert into performance_schema.setup_actors
values ('hosta', 'user1', '%');
insert into performance_schema.setup_actors
values ('%', 'user2', '%');
insert into performance_schema.setup_actors
values ('localhost', 'user3', '%');
insert into performance_schema.setup_actors
values ('hostb', '%', '%');
select * from performance_schema.setup_actors
order by USER, HOST, ROLE;
HOST	USER	ROLE
hostb	%	%
hosta	user1	%
%	user2	%
localhost	user3	%
grant ALL on *.* to user1@localhost;
grant ALL on *.* to user2@localhost;
grant ALL on *.* to user3@localhost;
grant ALL on *.* to user4@localhost;
grant select on test.* to user5@localhost;
flush privileges;
# Switch to (con1, localhost, user1, , )
select NAME, TYPE, INSTRUMENTED, PROCESSLIST_USER, PROCESSLIST_HOST
from performance_schema.threads
where PROCESSLIST_ID = connection_id();
NAME	TYPE	INSTRUMENTED	PROCESSLIST_USER	PROCESSLIST_HOST
thread/sql/one_connection	FOREGROUND	NO	user1	localhost
# Switch to connection default
insert into performance_schema.setup_actors
values ('%', 'user1', '%');
# Switch to connection con1
select NAME, TYPE, INSTRUMENTED, PROCESSLIST_USER, PROCESSLIST_HOST
from performance_schema.threads
where PROCESSLIST_ID = connection_id();
NAME	TYPE	INSTRUMENTED	PROCESSLIST_USER	PROCESSLIST_HOST
thread/sql/one_connection	FOREGROUND	NO	user1	localhost
# Disconnect con1
# Switch to (con2, localhost, user2, , )
select NAME, TYPE, INSTRUMENTED, PROCESSLIST_USER, PROCESSLIST_HOST
from performance_schema.threads
where PROCESSLIST_ID=connection_id();
NAME	TYPE	INSTRUMENTED	PROCESSLIST_USER	PROCESSLIST_HOST
thread/sql/one_connection	FOREGROUND	YES	user2	localhost
# Disconnect con2
# Switch to connection default
drop table if exists test.t1;
create table test.t1 (col1 bigint);
lock table test.t1 write;
# Switch to (con3, localhost, user3, , )
select NAME, TYPE, INSTRUMENTED, PROCESSLIST_USER, PROCESSLIST_HOST
from performance_schema.threads
where PROCESSLIST_ID = connection_id();
NAME	TYPE	INSTRUMENTED	PROCESSLIST_USER	PROCESSLIST_HOST
thread/sql/one_connection	FOREGROUND	YES	user3	localhost
# Send a statement to the server, but do not wait till the result
# comes back. We will pull this later.
insert into test.t1 set col1 = 1;
# Switch to (con4, localhost, user4, , )
# Poll till INFO is no more NULL and State = 'Waiting for table metadata lock'.
select count(*) = 1
from performance_schema.threads T inner join information_schema.PROCESSLIST P
on T.PROCESSLIST_ID = P.ID and T.PROCESSLIST_USER = P.USER and
T.PROCESSLIST_HOST = P.HOST and T.PROCESSLIST_DB = P.DB and
T.PROCESSLIST_COMMAND = P.COMMAND and T.PROCESSLIST_INFO = P.INFO
where T.PROCESSLIST_USER = 'user3' and T.NAME = 'thread/sql/one_connection';
count(*) = 1
1
# Switch to connection default
unlock tables;
# Switch to connection con3 and reap the result of the no more blocked insert
# Switch to connection default
drop table test.t1;
# Disconnect con3
# Switch to connection con4
select NAME, TYPE, INSTRUMENTED, PROCESSLIST_USER, PROCESSLIST_HOST
from performance_schema.threads
where PROCESSLIST_ID = connection_id();
NAME	TYPE	INSTRUMENTED	PROCESSLIST_USER	PROCESSLIST_HOST
thread/sql/one_connection	FOREGROUND	NO	user4	localhost
# Disconnect con4
# Switch to connection default
insert into performance_schema.setup_actors
values ('localhost', '%', '%');
select * from performance_schema.setup_actors
order by USER, HOST, ROLE;
HOST	USER	ROLE
hostb	%	%
localhost	%	%
%	user1	%
hosta	user1	%
%	user2	%
localhost	user3	%
# Switch to (con4b, localhost, user4, , )
select NAME, TYPE, INSTRUMENTED, PROCESSLIST_USER, PROCESSLIST_HOST
from performance_schema.threads
where PROCESSLIST_ID = connection_id();
NAME	TYPE	INSTRUMENTED	PROCESSLIST_USER	PROCESSLIST_HOST
thread/sql/one_connection	FOREGROUND	YES	user4	localhost
# Disconnect con4b
# Switch to connection default
insert into performance_schema.setup_actors
values ('%', 'user5', '%');
create sql security definer view test.v1 as select NAME, TYPE, INSTRUMENTED, PROCESSLIST_USER, PROCESSLIST_HOST
from performance_schema.threads
where PROCESSLIST_ID = connection_id();
# Switch to (con5, localhost, user5, , )
select * from performance_schema.threads;
ERROR 42000: SELECT command denied to user 'user5'@'localhost' for table 'threads'
select * from test.v1;
NAME	TYPE	INSTRUMENTED	PROCESSLIST_USER	PROCESSLIST_HOST
thread/sql/one_connection	FOREGROUND	YES	user5	localhost
# Disconnect con5
# Switch to connection default and cleanup
drop view test.v1;
revoke all privileges, grant option from user1@localhost;
revoke all privileges, grant option from user2@localhost;
revoke all privileges, grant option from user3@localhost;
revoke all privileges, grant option from user4@localhost;
revoke all privileges, grant option from user5@localhost;
drop user user1@localhost;
drop user user2@localhost;
drop user user3@localhost;
drop user user4@localhost;
drop user user5@localhost;
flush privileges;
truncate table performance_schema.setup_actors;
insert into performance_schema.setup_actors
values ('%', '%', '%');
select * from performance_schema.setup_actors;
HOST	USER	ROLE
%	%	%