DROP TABLE IF EXISTS t1,t2,t3;
grant CREATE, SELECT, DROP on *.* to test@localhost;
set global read_only=0;
create table t1 (a int);
insert into t1 values(1);
create table t2 select * from t1;
set global read_only=1;
create table t3 (a int);
drop table t3;
select @@global.read_only;
@@global.read_only
1
create table t3 (a int);
ERROR HY000: The MySQL server is running with the --read-only option so it cannot execute this statement
insert into t1 values(1);
ERROR HY000: The MySQL server is running with the --read-only option so it cannot execute this statement
update t1 set a=1 where 1=0;
ERROR HY000: The MySQL server is running with the --read-only option so it cannot execute this statement
update t1,t2 set t1.a=t2.a+1 where t1.a=t2.a;
ERROR HY000: The MySQL server is running with the --read-only option so it cannot execute this statement
delete t1,t2 from t1,t2 where t1.a=t2.a;
ERROR HY000: The MySQL server is running with the --read-only option so it cannot execute this statement
create temporary table t3 (a int);
create temporary table t4 (a int) select * from t3;
insert into t3 values(1);
insert into t4 select * from t3;
update t1,t3 set t1.a=t3.a+1 where t1.a=t3.a;
ERROR HY000: The MySQL server is running with the --read-only option so it cannot execute this statement
update t1,t3 set t3.a=t1.a+1 where t1.a=t3.a;
update t4,t3 set t4.a=t3.a+1 where t4.a=t3.a;
delete t1 from t1,t3 where t1.a=t3.a;
ERROR HY000: The MySQL server is running with the --read-only option so it cannot execute this statement
delete t3 from t1,t3 where t1.a=t3.a;
delete t4 from t3,t4 where t4.a=t3.a;
create temporary table t1 (a int);
insert into t1 values(1);
update t1,t3 set t1.a=t3.a+1 where t1.a=t3.a;
delete t1 from t1,t3 where t1.a=t3.a;
drop table t1;
insert into t1 values(1);
ERROR HY000: The MySQL server is running with the --read-only option so it cannot execute this statement
set global read_only=0;
lock table t1 write;
lock table t2 write;
set global read_only=1;
ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
unlock tables ;
set global read_only=1;
select @@global.read_only;
@@global.read_only
0
unlock tables ;
select @@global.read_only;
@@global.read_only
1
set global read_only=0;
lock table t1 read;
lock table t2 read;
set global read_only=1;
ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
unlock tables ;
set global read_only=1;
select @@global.read_only;
@@global.read_only
0
unlock tables ;
select @@global.read_only;
@@global.read_only
1
set global read_only=0;
BEGIN;
BEGIN;
set global read_only=1;
ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
ROLLBACK;
set global read_only=1;
select @@global.read_only;
@@global.read_only
1
ROLLBACK;
set global read_only=0;
flush tables with read lock;
set global read_only=1;
unlock tables;
set global read_only=0;
flush tables with read lock;
set global read_only=1;
select @@global.read_only;
@@global.read_only
1
unlock tables;
drop temporary table ttt;
ERROR 42S02: Unknown table 'ttt'
drop temporary table if exists ttt;
Warnings:
Note	1051	Unknown table 'ttt'
set global read_only=0;
drop table t1,t2;
drop user test@localhost;