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SET @saved_value_super= @@GLOBAL.SUPER_READ_ONLY;
SET @saved_value= @@GLOBAL.read_only;
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1);
include/save_binlog_position.inc
BEGIN;
UPDATE t1 SET a = 1;
SET GLOBAL SUPER_READ_ONLY=1;
COMMIT;
ERROR HY000: The MySQL server is running with the --super-read-only option so it cannot execute this statement
include/assert.inc [Binlog position did not advance]
check RO transaction still commits
BEGIN;
SELECT * FROM t1;
a
1
COMMIT;
check RO txs still can use implicit temporary tables
BEGIN;
SELECT * FROM t1 UNION SELECT * FROM t1;
a
1
COMMIT;
SET GLOBAL SUPER_READ_ONLY=0;
CREATE TEMPORARY TABLE t2 (a INT ) ENGINE=INNODB;
include/save_binlog_position.inc
BEGIN;
UPDATE t1 SET a = 1;
INSERT INTO t2 values(10);
SET GLOBAL SUPER_READ_ONLY=1;
COMMIT;
ERROR HY000: The MySQL server is running with the --super-read-only option so it cannot execute this statement
include/assert.inc [Binlog position did not advance]
DROP TABLE t2;
SET GLOBAL SUPER_READ_ONLY=0;
SET GLOBAL READ_ONLY=0;
CREATE USER test@localhost;
GRANT CREATE TEMPORARY TABLES, UPDATE, DROP ON *.* TO test@localhost;
include/save_binlog_position.inc
BEGIN;
UPDATE t1 SET a = 1;
SET GLOBAL READ_ONLY=1;
COMMIT;
ERROR HY000: The MySQL server is running with the --read-only option so it cannot execute this statement
include/assert.inc [Binlog position did not advance]
SET GLOBAL READ_ONLY=0;
CREATE TEMPORARY TABLE t2 (a INT) ENGINE=INNODB;
include/save_binlog_position.inc
BEGIN;
UPDATE t1 SET a = 1;
INSERT INTO t2 values(10);
SET GLOBAL READ_ONLY=1;
COMMIT;
ERROR HY000: The MySQL server is running with the --read-only option so it cannot execute this statement
include/assert.inc [Binlog position did not advance]
DROP TABLE t2;
DROP USER test@localhost;
SET GLOBAL SUPER_READ_ONLY= @saved_value_super;
SET GLOBAL read_only= @saved_value;
DROP TABLE t1;
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