mariadb/mysql-test/suite/innodb/t/lock_isolation.test

--source include/have_innodb.inc

--echo #
--echo # MDEV-26642 Weird SELECT view when a record is
--echo #            modified to the same value by two transactions
--echo # MDEV-32898 Phantom rows caused by updates of PRIMARY KEY
--echo #

CREATE TABLE t(a INT PRIMARY KEY, b INT) ENGINE=InnoDB;
INSERT INTO t VALUES (1,1),(2,2);
BEGIN; SELECT * FROM t LOCK IN SHARE MODE;
--connect con_weird,localhost,root
BEGIN;
SELECT * FROM t;
--connect consistent,localhost,root
SET innodb_snapshot_isolation=ON;
BEGIN;
SELECT * FROM t;
--connection default
UPDATE t SET a=3 WHERE b=2;
COMMIT;
--connection consistent
--error ER_CHECKREAD
UPDATE t SET b=3;
SELECT * FROM t;
COMMIT;
--connection con_weird
UPDATE t SET b=3;
SELECT * FROM t;
COMMIT;
--connection default
SELECT * FROM t;
DROP TABLE t;

--echo #
--echo # MDEV-26643 Inconsistent behaviors of UPDATE under
--echo #            READ UNCOMMITTED and READ COMMITTED isolation level
--echo #

CREATE TABLE t(a INT, b INT) ENGINE=InnoDB;
INSERT INTO t VALUES(NULL, 1), (2, 2);
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
BEGIN; UPDATE t SET a = 10;

--connection consistent
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
--send UPDATE t SET b = 20 WHERE a

--connection default
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = 'Updating'
  and info = 'UPDATE t SET b = 20 WHERE a';
--source include/wait_condition.inc

COMMIT;

--connection consistent
--reap
SELECT * FROM t;

--connection default
TRUNCATE TABLE t;
INSERT INTO t VALUES(NULL, 1), (2, 2);
BEGIN; UPDATE t SET a = 10;

--connection consistent
SET TRANSACTION ISOLATION LEVEL READ COMMITTED;
--send UPDATE t SET b = 20 WHERE a

--connection default
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where info = 'UPDATE t SET b = 20 WHERE a';
--source include/wait_condition.inc

COMMIT;

--connection consistent
--reap
SELECT * FROM t;

--connection default
TRUNCATE TABLE t;
INSERT INTO t VALUES(NULL, 1), (2, 2);
BEGIN; UPDATE t SET a = 10;

--connection con_weird
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
send UPDATE t SET b = 20 WHERE a;

--connection default
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = 'Updating'
  and info = 'UPDATE t SET b = 20 WHERE a';
--source include/wait_condition.inc

SELECT * FROM t;
COMMIT;

--connection con_weird
--reap
COMMIT;

--connection default
SELECT * FROM t;
TRUNCATE TABLE t;

--echo #
--echo # MDEV-34108 Inappropriate semi-consistent read in snapshot isolation
--echo #
INSERT INTO t VALUES(NULL, 1), (1, 1);
BEGIN;
UPDATE t SET b = 3;

--connection consistent
SET TRANSACTION ISOLATION LEVEL READ COMMITTED;
BEGIN;
# As semi-consistent read is disabled for innodb_snapshot_isolation=ON, the
# following UPDATE must be blocked on the first record.
--send UPDATE t SET b = 2 WHERE a

--connection default
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = 'Updating' and info = 'UPDATE t SET b = 2 WHERE a';
--source include/wait_condition.inc

UPDATE t SET a = 1;
COMMIT;
--connection consistent
# If the bug wouldn't be fixed, the result would be (1,3),(1,2), because
# "UPDATE t SET b = 2 WHERE a" would be blocked on the second (1,3) record,
# as semi-consistent read would filter out the first (null,3) record without
# blocking.
--reap
COMMIT;

--connection default
SELECT * FROM t;
DROP TABLE t;

--echo #
--echo # MDEV-33802 Weird read view after ROLLBACK of other transactions
--echo #

CREATE TABLE t(a INT PRIMARY KEY, b INT UNIQUE) ENGINE=InnoDB;
INSERT INTO t SET a=1;

BEGIN; INSERT INTO t SET a=2;

--connection consistent
START TRANSACTION WITH CONSISTENT SNAPSHOT;
--disable_ps2_protocol
--error ER_CHECKREAD
SELECT * FROM t FORCE INDEX (b) FOR UPDATE;
--enable_ps2_protocol

--connection con_weird
START TRANSACTION WITH CONSISTENT SNAPSHOT;
send
SELECT * FROM t FORCE INDEX (b) FOR UPDATE;

--connection default
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = 'Sending data'
  and info LIKE 'SELECT * FROM t %';
--source include/wait_condition.inc
ROLLBACK;

--connection con_weird
--reap
SELECT * FROM t FORCE INDEX (b) FOR UPDATE;
--disconnect con_weird

--connection consistent
SELECT * FROM t FORCE INDEX (b) FOR UPDATE;
--disconnect consistent

--connection default
DROP TABLE t;