connect con1, localhost, root;
CREATE TABLE t(a INT PRIMARY KEY) ENGINE=InnoDB;
INSERT INTO t VALUES(1);
BEGIN;
INSERT INTO t VALUES(2);
DELETE FROM t WHERE a=2;
connect con2, localhost, root;
# Normal MariaDB shutdown would roll back the above transaction.
# We want the transaction to remain open, so we will kill the server
# after ensuring that any non-transactional files are clean.
FLUSH TABLES;
# Create another transaction that will be recovered as COMMITTED.
BEGIN;
SET DEBUG_SYNC='after_trx_committed_in_memory SIGNAL committed WAIT_FOR ever';
COMMIT;
connection default;
SET DEBUG_SYNC='now WAIT_FOR committed';
# Ensure that the above incomplete transactions become durable.
SET GLOBAL innodb_flush_log_at_trx_commit=1;
BEGIN;
INSERT INTO t VALUES(-10000);
ROLLBACK;
disconnect con1;
disconnect con2;
SELECT * FROM t;
a
1
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
SELECT * FROM t;
a
1
UPDATE t SET a=3 WHERE a=1;
SET GLOBAL innodb_status_output= @@GLOBAL.innodb_status_output;
# Starting with MariaDB 10.2, innodb_read_only implies READ UNCOMMITTED.
# In earlier versions, this would return the last committed version
# (empty table)!
SELECT * FROM t;
a
3
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
SELECT * FROM t;
a
3
SELECT * FROM t;
a
3
DROP TABLE t;
FOUND 1 /Rolled back recovered transaction [^0]/ in mysqld.1.err