132 lines
4.5 KiB
Plaintext
132 lines
4.5 KiB
Plaintext
set @start_read_only= @@global.read_only;
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set @start_autocommit= @@global.autocommit;
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set @@global.autocommit= 0;
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CREATE USER test@localhost;
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grant CREATE, SELECT, UPDATE on *.* to test@localhost;
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CREATE USER test2@localhost;
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grant CREATE, SELECT, UPDATE on *.* to test2@localhost;
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connection default;
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CREATE TABLE t1 ( a INT, b INT) ENGINE=InnoDB;
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INSERT INTO t1 VALUES (1, 1);
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INSERT INTO t1 VALUES (2, 2);
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INSERT INTO t1 VALUES (3, 3);
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CREATE VIEW v1 AS SELECT * FROM t1;
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CREATE TABLE t2 ( a INT) ENGINE=InnoDB;
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INSERT INTO t2 VALUES (10);
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INSERT INTO t2 VALUES (20);
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INSERT INTO t2 VALUES (30);
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#######################################################################
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# SELECT...FOR UPDATE:sequential search lock all rows as no key exists
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connect con1,localhost,test,,test;
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SET SESSION innodb_lock_wait_timeout=1;
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BEGIN;
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SELECT * FROM t1 WHERE a=2 FOR UPDATE ;
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a b
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2 2
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connect con2,localhost,test2,,test;
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BEGIN;
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SET SESSION innodb_lock_wait_timeout=1;
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#
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# UPDATE ...
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SELECT * FROM t1 FOR UPDATE;
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ERROR HY000: Lock wait timeout exceeded; try restarting transaction
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SELECT * FROM t1 FOR UPDATE NOWAIT;
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ERROR HY000: Statement aborted because lock(s) could not be acquired immediately and NOWAIT is set.
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SELECT * FROM t1 FOR UPDATE SKIP LOCKED;
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a b
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#
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# SHARE ...
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SELECT * FROM t1 FOR SHARE;
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ERROR HY000: Lock wait timeout exceeded; try restarting transaction
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SELECT * FROM t1 FOR SHARE NOWAIT;
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ERROR HY000: Statement aborted because lock(s) could not be acquired immediately and NOWAIT is set.
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SELECT * FROM t1 FOR SHARE SKIP LOCKED;
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a b
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#
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# Dual locking clauses
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SELECT * FROM t1, t2 FOR SHARE OF t1 FOR UPDATE OF t2;
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ERROR HY000: Lock wait timeout exceeded; try restarting transaction
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SELECT * FROM t1, t2 FOR SHARE OF t1 FOR SHARE OF t2;
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ERROR HY000: Lock wait timeout exceeded; try restarting transaction
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SELECT * FROM t1 FOR SHARE OF t1 NOWAIT;
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ERROR HY000: Statement aborted because lock(s) could not be acquired immediately and NOWAIT is set.
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SELECT * FROM t1 FOR SHARE OF t1 SKIP LOCKED;
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a b
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SELECT * FROM t1, t2 FOR SHARE OF t1 NOWAIT FOR SHARE OF t2 NOWAIT;
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ERROR HY000: Statement aborted because lock(s) could not be acquired immediately and NOWAIT is set.
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explain SELECT * FROM t1, t2 FOR SHARE OF t1 SKIP LOCKED
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FOR UPDATE OF t2 NOWAIT;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 3 100.00 NULL
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1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 3 100.00 Using join buffer (Block Nested Loop)
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Warnings:
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Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a` from `test`.`t1` join `test`.`t2`
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COMMIT;
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connection con1;
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commit;
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connection default;
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ALTER TABLE t1 ADD PRIMARY KEY (a);
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########################################################################
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# SELECT ... FOR UPDATE is only locking row with a=2
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connection con1;
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BEGIN;
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SELECT * FROM t1 WHERE a=2 FOR UPDATE ;
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a b
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2 2
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connection con2;
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BEGIN;
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SET SESSION innodb_lock_wait_timeout=1;
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#
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# UPDATE ...
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SELECT * FROM t1 FOR UPDATE;
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ERROR HY000: Lock wait timeout exceeded; try restarting transaction
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SELECT * FROM t1 FOR UPDATE NOWAIT;
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ERROR HY000: Statement aborted because lock(s) could not be acquired immediately and NOWAIT is set.
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SELECT * FROM t1 ORDER BY a FOR UPDATE SKIP LOCKED;
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a b
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1 1
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3 3
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UPDATE t1 SET b=4 WHERE a=3;
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UPDATE t1 SET b=5 WHERE a=1;
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SELECT * FROM t1 ORDER BY a;
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a b
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1 5
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2 2
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3 4
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#
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# SHARE ...
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SELECT * FROM t1 FOR SHARE;
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ERROR HY000: Lock wait timeout exceeded; try restarting transaction
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SELECT * FROM t1 FOR SHARE NOWAIT;
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ERROR HY000: Statement aborted because lock(s) could not be acquired immediately and NOWAIT is set.
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SELECT * FROM t1 ORDER BY a FOR SHARE SKIP LOCKED;
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a b
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1 5
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3 4
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#
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# Dual locking clauses
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SELECT * FROM t1, t2 FOR SHARE OF t1 FOR UPDATE OF t2;
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ERROR HY000: Lock wait timeout exceeded; try restarting transaction
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SELECT * FROM t1, t2 FOR SHARE OF t1 FOR SHARE OF t2;
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ERROR HY000: Lock wait timeout exceeded; try restarting transaction
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SELECT * FROM t1 FOR SHARE OF t1 NOWAIT;
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ERROR HY000: Statement aborted because lock(s) could not be acquired immediately and NOWAIT is set.
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SELECT * FROM t1 FOR SHARE OF t1 SKIP LOCKED;
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a b
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1 5
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3 4
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SELECT * FROM t1, t2 FOR SHARE OF t1 NOWAIT FOR SHARE OF t2 NOWAIT;
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ERROR HY000: Statement aborted because lock(s) could not be acquired immediately and NOWAIT is set.
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COMMIT;
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connection con1;
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COMMIT;
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connection default;
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disconnect con1;
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disconnect con2;
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DROP VIEW v1;
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DROP TABLE t1, t2;
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DROP USER test@localhost;
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DROP USER test2@localhost;
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set @@global.read_only= @start_read_only;
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set @@global.autocommit= @start_autocommit;
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