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SET @debug_saved = @@global.debug;
START TRANSACTION;
CREATE TABLE t1(a INT PRIMARY KEY AUTO_INCREMENT, b VARCHAR(255)) engine = innodb;
INSERT INTO t1(b) VALUES ('aaa');
INSERT INTO t1(b) VALUES ('bbb');
INSERT INTO t1(b) VALUES ('ccc');
COMMIT;
# 1. Start outer transaction with SERIALIZABLE isolation level.
# Check that SELECT in inner transaction will not take locks.
# Start transaction.
SET TRANSACTION ISOLATION LEVEL SERIALIZABLE;
START TRANSACTION;
# Insert a new row into t1.
INSERT INTO t1(b) VALUES ('ddd');
SELECT * FROM t1;
a b
1 aaa
2 bbb
3 ccc
4 ddd
# [another connection]
SET TRANSACTION ISOLATION LEVEL SERIALIZABLE;
START TRANSACTION;
SET @@global.debug = '+d,use_attachable_trx';
SELECT * FROM t1;
a b
1 aaa
2 bbb
3 ccc
SET @@global.debug = '-d,use_attachable_trx';
# [default connection]
ROLLBACK;
# 2. Check that inner transaction has different visibility scope than
# the outer transaction.
# Start READ ONLY transaction.
SET TRANSACTION ISOLATION LEVEL REPEATABLE READ;
START TRANSACTION READ ONLY;
# SELECT to actually start a transaction.
SELECT * FROM t1;
a b
1 aaa
2 bbb
3 ccc
# [another connection]
START TRANSACTION;
UPDATE t1 SET b = 'zzz' WHERE a = 2;
COMMIT;
# [default connection]
# SELECT in the outer transaction doesn't see the changes.
SELECT * FROM t1;
a b
1 aaa
2 bbb
3 ccc
# SELECT in the inner transaction sees the changes.
SET @@global.debug = '+d,use_attachable_trx';
SELECT * FROM t1;
a b
1 aaa
2 zzz
3 ccc
SET @@global.debug = '-d,use_attachable_trx';
# COMMIT the outer transaction.
COMMIT;
# SELECT in the outer transaction now sees the changes.
SELECT * FROM t1;
a b
1 aaa
2 zzz
3 ccc
COMMIT;
# 3. Check that the inner transaction does not reset a save point set in
# the outer transaction.
# Start transaction.
SET TRANSACTION ISOLATION LEVEL REPEATABLE READ;
START TRANSACTION;
SELECT * FROM t1;
a b
1 aaa
2 zzz
3 ccc
# Set save point.
SAVEPOINT sp1;
# Do some changes.
UPDATE t1 SET b = 'xxx' WHERE a = 2;
SELECT * FROM t1;
a b
1 aaa
2 xxx
3 ccc
# Do anything in the inner transaction.
SET @@global.debug = '+d,use_attachable_trx';
SELECT * FROM t1;
a b
1 aaa
2 zzz
3 ccc
SET @@global.debug = '-d,use_attachable_trx';
# Just make sure the changes are still there.
SELECT * FROM t1;
a b
1 aaa
2 xxx
3 ccc
# Rollback to the save point to make sure it was not reset.
ROLLBACK TO SAVEPOINT sp1;
# Check that the changes have been reverted.
SELECT * FROM t1;
a b
1 aaa
2 zzz
3 ccc
# Commit.
COMMIT;
# Cleanup.
DROP TABLE t1;
SET @@global.debug = @debug_saved;