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DROP TABLE IF EXISTS t1 ; set @orig_sql_mode= @@sql_mode; set sql_mode= (select replace(@@sql_mode,'NO_AUTO_CREATE_USER','')); Warnings: Warning 3090 Changing sql mode 'NO_AUTO_CREATE_USER' is deprecated. It will be removed in a future release. # READ_ONLY does nothing to SUPER users # so we use a non-SUPER one: GRANT CREATE, SELECT, DROP ON *.* TO test@localhost; Warnings: Warning 1287 Using GRANT for creating new user is deprecated and will be removed in future release. Create new user with CREATE USER statement. connect con1,localhost,test,,test; connection default; SET GLOBAL READ_ONLY=1; connection con1; CREATE TEMPORARY TABLE t1 (a INT) ENGINE=INNODB; # Test INSERTS with autocommit being off and on. BEGIN; INSERT INTO t1 VALUES (10); COMMIT; INSERT INTO t1 VALUES (20); # Test UPDATES with autocommit being off and on. BEGIN; UPDATE t1 SET a=30 WHERE a=10; COMMIT; UPDATE t1 SET a=40 WHERE a=20; connection default; SET GLOBAL READ_ONLY=0; # Test scenario where global read_only is enabled in the middle of transaction. # Test INSERT operations on temporary tables, INSERTs should be successful even # when global read_only is enabled. connection con1; BEGIN; INSERT INTO t1 VALUES(50); connection default; SET GLOBAL READ_ONLY=1; connection con1; SELECT @@GLOBAL.READ_ONLY; @@GLOBAL.READ_ONLY 1 COMMIT; connection default; SET GLOBAL READ_ONLY=0; # Test UPDATE operations on temporary tables, UPDATEs should be successful even # when global read_only is enabled. connection con1; BEGIN; UPDATE t1 SET a=60 WHERE a=50; connection default; SET GLOBAL READ_ONLY=1; connection con1; SELECT @@GLOBAL.READ_ONLY; @@GLOBAL.READ_ONLY 1 COMMIT; SELECT * FROM t1; a 30 40 60 # Clean up connection default; SET GLOBAL READ_ONLY=0; disconnect con1; DROP USER test@localhost; set sql_mode= @orig_sql_mode; Warnings: Warning 3090 Changing sql mode 'NO_AUTO_CREATE_USER' is deprecated. It will be removed in a future release.