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DROP TABLE IF EXISTS bug_53756 ; CREATE TABLE bug_53756 (pk INT, c1 INT) ENGINE=InnoDB; ALTER TABLE bug_53756 ADD PRIMARY KEY (pk); INSERT INTO bug_53756 VALUES(1, 11), (2, 22), (3, 33), (4, 44); # Select a less restrictive isolation level. SET GLOBAL TRANSACTION ISOLATION LEVEL READ COMMITTED; SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED; COMMIT; # Start a transaction in the default connection for isolation. START TRANSACTION; SELECT @@tx_isolation; @@tx_isolation READ-COMMITTED Warnings: Warning 1287 '@@tx_isolation' is deprecated and will be removed in a future release. Please use '@@transaction_isolation' instead SELECT * FROM bug_53756; pk c1 1 11 2 22 3 33 4 44 # connection con1 deletes row 1 START TRANSACTION; SELECT @@tx_isolation; @@tx_isolation READ-COMMITTED Warnings: Warning 1287 '@@tx_isolation' is deprecated and will be removed in a future release. Please use '@@transaction_isolation' instead DELETE FROM bug_53756 WHERE pk=1; # connection con2 deletes row 2 START TRANSACTION; SELECT @@tx_isolation; @@tx_isolation READ-COMMITTED Warnings: Warning 1287 '@@tx_isolation' is deprecated and will be removed in a future release. Please use '@@transaction_isolation' instead DELETE FROM bug_53756 WHERE pk=2; # connection con3 updates row 3 START TRANSACTION; SELECT @@tx_isolation; @@tx_isolation READ-COMMITTED Warnings: Warning 1287 '@@tx_isolation' is deprecated and will be removed in a future release. Please use '@@transaction_isolation' instead UPDATE bug_53756 SET c1=77 WHERE pk=3; # connection con4 updates row 4 START TRANSACTION; SELECT @@tx_isolation; @@tx_isolation READ-COMMITTED Warnings: Warning 1287 '@@tx_isolation' is deprecated and will be removed in a future release. Please use '@@transaction_isolation' instead UPDATE bug_53756 SET c1=88 WHERE pk=4; # connection con5 inserts row 5 START TRANSACTION; SELECT @@tx_isolation; @@tx_isolation READ-COMMITTED Warnings: Warning 1287 '@@tx_isolation' is deprecated and will be removed in a future release. Please use '@@transaction_isolation' instead INSERT INTO bug_53756 VALUES(5, 55); # connection con6 inserts row 6 START TRANSACTION; SELECT @@tx_isolation; @@tx_isolation READ-COMMITTED Warnings: Warning 1287 '@@tx_isolation' is deprecated and will be removed in a future release. Please use '@@transaction_isolation' instead INSERT INTO bug_53756 VALUES(6, 66); # connection con1 commits. COMMIT; # connection con3 commits. COMMIT; # connection con4 rolls back. ROLLBACK; # connection con6 rolls back. ROLLBACK; # The connections 2 and 5 stay open. # connection default selects resulting data. # Delete of row 1 was committed. # Update of row 3 was committed. # Due to isolation level read committed, these should be included. # All other changes should not be included. SELECT * FROM bug_53756; pk c1 2 22 3 77 4 44 # connection default # # Crash server. START TRANSACTION; INSERT INTO bug_53756 VALUES (666,666); SET SESSION debug="+d,crash_commit_before"; COMMIT; ERROR HY000: Lost connection to MySQL server during query # # disconnect con1, con2, con3, con4, con5, con6. # # Restart server. # # Select recovered data. # Delete of row 1 was committed. # Update of row 3 was committed. # These should be included. # All other changes should not be included. # Delete of row 2 and insert of row 5 should be rolled back SELECT * FROM bug_53756; pk c1 2 22 3 77 4 44 # Clean up. DROP TABLE bug_53756; Warnings: Warning 1287 '@@tx_isolation' is deprecated and will be removed in a future release. Please use '@@transaction_isolation' instead Warnings: Warning 1287 '@@tx_isolation' is deprecated and will be removed in a future release. Please use '@@transaction_isolation' instead