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drop table if exists t1,t2; create table t1(n int); insert into t1 values (1); select get_lock("mysqltest_lock", 100); get_lock("mysqltest_lock", 100) 1 update t1 set n = 2 and get_lock('mysqltest_lock', 100); update low_priority t1 set n = 4; select n from t1; select release_lock("mysqltest_lock"); release_lock("mysqltest_lock") 1 select release_lock("mysqltest_lock"); release_lock("mysqltest_lock") 1 n 4 drop table t1; create table t1(n int); insert into t1 values (1); select get_lock("mysqltest_lock", 100); get_lock("mysqltest_lock", 100) 1 select n from t1 where get_lock('mysqltest_lock', 100); update low_priority t1 set n = 4; select n from t1; n 1 select release_lock("mysqltest_lock"); release_lock("mysqltest_lock") 1 n 1 select release_lock("mysqltest_lock"); release_lock("mysqltest_lock") 1 drop table t1; create table t1 (a int, b int); create table t2 (c int, d int); insert into t1 values(1,1); insert into t1 values(2,2); insert into t2 values(1,2); lock table t1 read; update t1,t2 set c=a where b=d; select c from t2; c 2 unlock tables; drop table t1; drop table t2; create table t1 (a int); create table t2 (a int); lock table t1 write, t2 write; insert t1 select * from t2; drop table t2; unlock tables; ERROR 42S02: Table 'test.t2' doesn't exist drop table t1; create table t1 (a int); create table t2 (a int); lock table t1 write, t2 write, t1 as t1_2 write, t2 as t2_2 write; insert t1 select * from t2; drop table t2; unlock tables; ERROR 42S02: Table 'test.t2' doesn't exist drop table t1; End of 4.1 tests create table t1(a int); lock tables t1 write; show columns from t1; Field Type Null Key Default Extra a int(11) YES NULL unlock tables; drop table t1; USE mysql; LOCK TABLES columns_priv WRITE, db WRITE, user WRITE; FLUSH TABLES; USE mysql; SELECT user.Select_priv FROM user, db WHERE user.user = db.user LIMIT 1; OPTIMIZE TABLES columns_priv, db, user; Table Op Msg_type Msg_text mysql.columns_priv optimize status OK mysql.db optimize status OK mysql.user optimize status OK UNLOCK TABLES; Select_priv N USE test; use test; CREATE TABLE t1 (c1 int); LOCK TABLE t1 WRITE; FLUSH TABLES WITH READ LOCK; CREATE TABLE t2 (c1 int); ERROR HY000: Table 't2' was not locked with LOCK TABLES UNLOCK TABLES; UNLOCK TABLES; DROP TABLE t1; CREATE TABLE t1 (c1 int); LOCK TABLE t1 WRITE; FLUSH TABLES WITH READ LOCK; CREATE TABLE t2 AS SELECT * FROM t1; ERROR HY000: Table 't2' was not locked with LOCK TABLES UNLOCK TABLES; UNLOCK TABLES; DROP TABLE t1; CREATE DATABASE mysqltest_1; FLUSH TABLES WITH READ LOCK; DROP DATABASE mysqltest_1; DROP DATABASE mysqltest_1; ERROR HY000: Can't execute the query because you have a conflicting read lock UNLOCK TABLES; DROP DATABASE mysqltest_1; ERROR HY000: Can't drop database 'mysqltest_1'; database doesn't exist create table t1 (f1 int(12) unsigned not null auto_increment, primary key(f1)) engine=innodb; lock tables t1 write; alter table t1 auto_increment=0; alter table t1 auto_increment=0; unlock tables; drop table t1; create table t1 (a int); create table t2 like t1; # con1 lock tables t1 write; # con2 flush tables with read lock; # con5 # global read lock is taken # con3 select * from t2 for update; # waiting for release of read lock # con4 # would hang and later cause a deadlock flush tables t2; # clean up unlock tables; unlock tables; a drop table t1,t2; # # Lightweight version: # Ensure that the wait for a GRL is done before opening tables. # create table t1 (a int); create table t2 like t1; # # UPDATE # # default flush tables with read lock; # con1 update t2 set a = 1; # default # statement is waiting for release of read lock # con2 flush table t2; # default unlock tables; # con1 # # LOCK TABLES .. WRITE # # default flush tables with read lock; # con1 lock tables t2 write; # default # statement is waiting for release of read lock # con2 flush table t2; # default unlock tables; # con1 unlock tables; drop table t1,t2; End of 5.0 tests create table t1 (i int); lock table t1 read; update t1 set i= 10; select * from t1; kill query ID; i ERROR 70100: Query execution was interrupted unlock tables; drop table t1; drop table if exists t1; create table t1 (a int) ENGINE=MEMORY; --> client 2 handler t1 open; ERROR HY000: Table storage engine for 't1' doesn't have this option --> client 1 drop table t1; drop table if exists t1; create table t1 (i int); connection: default lock tables t1 write; connection: flush flush tables with read lock;; connection: default alter table t1 add column j int; connection: insert insert into t1 values (1,2);; connection: default unlock tables; connection: flush select * from t1; i j unlock tables; select * from t1; i j 1 2 drop table t1; drop table if exists t1; create table t1 (i int); connection: default lock tables t1 write; connection: flush flush tables with read lock;; connection: default flush tables; unlock tables; drop table t1; drop table if exists t1,t2; create table t1 (a int); flush status; lock tables t1 read; insert into t1 values(1); unlock tables; drop table t1; select @tlwa < @tlwb; @tlwa < @tlwb 1 End of 5.1 tests drop table if exists t1; create table t1 (i int); connection: default lock tables t1 write; connection: flush flush tables with read lock;; connection: default flush tables; drop table t1; # # Test for bug #46272 "MySQL 5.4.4, new MDL: unnecessary deadlock". # drop table if exists t1; create table t1 (c1 int primary key, c2 int, c3 int); insert into t1 values (1,1,0),(2,2,0),(3,3,0),(4,4,0),(5,5,0); begin; update t1 set c3=c3+1 where c2=3; # # Switching to connection 'con46272'. # The below ALTER TABLE statement should wait till transaction # in connection 'default' is complete and then succeed. # It should not deadlock or fail with ER_LOCK_DEADLOCK error. # Sending: alter table t1 add column c4 int;; # # Switching to connection 'default'. # Wait until the above ALTER TABLE gets blocked because this # connection holds SW metadata lock on table to be altered. # The below statement should succeed. It should not # deadlock or end with ER_LOCK_DEADLOCK error. update t1 set c3=c3+1 where c2=4; # Unblock ALTER TABLE by committing transaction. commit; # # Switching to connection 'con46272'. # Reaping ALTER TABLE. # # Switching to connection 'default'. drop table t1; # # Bug#47249 assert in MDL_global_lock::is_lock_type_compatible # DROP TABLE IF EXISTS t1; DROP VIEW IF EXISTS v1; # # Test 1: LOCK TABLES v1 WRITE, t1 READ; # # Thanks to the fact that we no longer allow DDL on tables # which are locked for write implicitly, the exact scenario # in which assert was failing is no longer repeatable. CREATE TABLE t1 ( f1 integer ); CREATE VIEW v1 AS SELECT f1 FROM t1 ; LOCK TABLES v1 WRITE, t1 READ; FLUSH TABLE t1; ERROR HY000: Table 't1' was locked with a READ lock and can't be updated UNLOCK TABLES; DROP TABLE t1; DROP VIEW v1; # # Test 2: LOCK TABLES t1 WRITE, v1 READ; # CREATE TABLE t1 ( f1 integer ); CREATE VIEW v1 AS SELECT f1 FROM t1 ; # Connection 2 LOCK TABLES t1 WRITE, v1 READ; FLUSH TABLE t1; # Connection 1 LOCK TABLES t1 WRITE; FLUSH TABLE t1; DROP TABLE t1; DROP VIEW v1; # # Test for bug #50913 "Deadlock between open_and_lock_tables_derived # and MDL". Also see additional coverage in mdl_sync.test. # drop table if exists t1; drop view if exists v1; create table t1 (i int); create view v1 as select i from t1; begin; select * from t1; i # Switching to connection 'con50913'. # Sending: alter table t1 add column j int; # Switching to connection 'default'. # Wait until ALTER TABLE gets blocked. # The below statement should try to acquire SW lock on 't1' # and therefore should get ER_LOCK_DEADLOCK error. Before # bug fix it acquired SR lock and hung on thr_lock.c lock. delete a from t1 as a where i = 1; ERROR 40001: Deadlock found when trying to get lock; try restarting transaction # Unblock ALTER TABLE. commit; # Switching to connection 'con50913'. # Reaping ALTER TABLE; # Switching to connection 'default'. begin; select * from v1; i # Switching to connection 'con50913'. # Sending: alter table t1 drop column j; # Switching to connection 'default'. # Wait until ALTER TABLE gets blocked. # The below statement should try to acquire SW lock on 't1' # and therefore should get ER_LOCK_DEADLOCK error. Before # bug fix it acquired SR lock and hung on thr_lock.c lock. insert into v1 values (1); ERROR 40001: Deadlock found when trying to get lock; try restarting transaction # Unblock ALTER TABLE. commit; # Switching to connection 'con50913'. # Reaping ALTER TABLE; # Switching to connection 'default'. drop view v1; drop table t1; # # Bug#45225 Locking: hang if drop table with no timeout # # These tests also provide function coverage for the # lock_wait_timeout server variable. # DROP TABLE IF EXISTS t1; CREATE TABLE t1 (id int); SET SESSION lock_wait_timeout= 1; # # Test 1: acquire exclusive lock # # Connection default START TRANSACTION; INSERT INTO t1 VALUES (1); # Connection 2 DROP TABLE t1; ERROR HY000: Lock wait timeout exceeded; try restarting transaction # Connection default COMMIT; # # Test 2: upgrade shared lock # # Connection default START TRANSACTION; SELECT * FROM t1; id 1 # Connection 2 ALTER TABLE t1 RENAME TO t2; ERROR HY000: Lock wait timeout exceeded; try restarting transaction # Connection default COMMIT; # # Test 3: acquire shared lock # # Connection default LOCK TABLE t1 WRITE; # Connection 2 INSERT INTO t1(id) VALUES (2); ERROR HY000: Lock wait timeout exceeded; try restarting transaction # Connection default UNLOCK TABLES; # # Test 4: table level locks # # Connection default LOCK TABLE t1 READ; # Connection 2 INSERT INTO t1(id) VALUES(4); ERROR HY000: Lock wait timeout exceeded; try restarting transaction # Connection default UNLOCK TABLES; # # Test 5: Waiting on Table Definition Cache (TDC) # # Connection default LOCK TABLE t1 READ; # Connection con3 # Sending: FLUSH TABLES; # Connection con2 SELECT * FROM t1; ERROR HY000: Lock wait timeout exceeded; try restarting transaction # Connection default UNLOCK TABLES; # Connection con3 # Reaping: FLUSH TABLES # # Test 6: Timeouts in I_S queries # # Connection default CREATE TABLE t2 (id INT); LOCK TABLE t2 WRITE; # Connection con3 # Sending: DROP TABLE t1, t2; # Connection con2 SELECT table_name, table_comment FROM information_schema.tables WHERE table_schema= 'test' AND table_name= 't1'; table_name table_comment t1 Lock wait timeout exceeded; try restarting transaction Warnings: Warning 1205 Lock wait timeout exceeded; try restarting transaction # Connection default UNLOCK TABLES; # Connection con3 # Reaping: DROP TABLE t1, t2 # Connection default # Cleanup # # Test for bug #51134 "Crash in MDL_lock::destroy on a concurrent # DDL workload". # drop tables if exists t1, t2, t3; create table t3 (i int); # Switching to connection 'con1' # Lock 't3' so upcoming RENAME is blocked. lock table t3 read; # Switching to connection 'con2' # Remember ID for this connection. # Start statement which will try to acquire two instances # of X metadata lock on the same object. # Sending: rename tables t1 to t2, t2 to t3;; # Switching to connection 'default' # Wait until RENAME TABLE is blocked on table 't3'. # Kill RENAME TABLE. kill query ID; # Switching to connection 'con2' # RENAME TABLE should be aborted but should not crash. ERROR 70100: Query execution was interrupted # Switching to connection 'con1' unlock tables; # Switching to connection 'default' drop table t3; # # Test for the bug where upgradable metadata locks was acquired # even if the table to altered was temporary. # Bug found while working on the related bug #51240. # DROP TABLE IF EXISTS t1; CREATE TABLE t1 (id INT); LOCK TABLE t1 WRITE; # Connection con1 CREATE TEMPORARY TABLE t1 (id INT); ALTER TABLE t1 ADD COLUMN j INT; # Connection default UNLOCK TABLES; DROP TABLE t1;