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This also means SKIP LOCKED is compatible with the NOWAIT/ WAIT n syntax consisten with the MySQL-8.0 implementation.
73 lines
1.7 KiB
Plaintext
73 lines
1.7 KiB
Plaintext
connect con1,localhost,root,,;
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SET SESSION innodb_lock_wait_timeout=1;
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connection default;
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SET SESSION innodb_lock_wait_timeout=1;
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# Case 1: Test primary index - CREATE TABLE .. SELECT .. SKIP LOCKED
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CREATE TABLE t1(
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seat_id INT,
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state INT,
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PRIMARY KEY(seat_id)
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) ENGINE=InnoDB;
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INSERT INTO t1 VALUES(1,0), (2,0), (3,0), (4,0);
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BEGIN;
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SELECT * FROM t1 WHERE state = 0 LIMIT 2 LOCK IN SHARE MODE;
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seat_id state
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1 0
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2 0
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connection con1;
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BEGIN;
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CREATE TEMPORARY TABLE s0 AS SELECT * FROM t1 WHERE state = 0 LIMIT 2 LOCK IN SHARE MODE;
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SELECT * FROM s0;
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seat_id state
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1 0
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2 0
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CREATE TEMPORARY TABLE s1 AS SELECT * FROM t1 WHERE state = 0 LIMIT 2 FOR UPDATE SKIP LOCKED;
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SELECT * FROM s1;
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seat_id state
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3 0
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4 0
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connection default;
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CREATE TEMPORARY TABLE s0 AS SELECT * FROM t1 WHERE state = 0 LOCK IN SHARE MODE SKIP LOCKED;
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SELECT * FROM s0;
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seat_id state
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1 0
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2 0
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COMMIT;
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DROP TABLE s0;
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connection con1;
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COMMIT;
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DROP TABLE s0, s1;
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connection default;
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# Case 2: Test primary index - INSERT .. SELECT .. SKIP LOCKED
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CREATE TABLE t2 LIKE t1;
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BEGIN;
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SELECT * FROM t1 WHERE state = 0 LIMIT 2 LOCK IN SHARE MODE;
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seat_id state
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1 0
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2 0
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connection con1;
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BEGIN;
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INSERT INTO t2 SELECT * FROM t1 WHERE state = 0 LIMIT 2 LOCK IN SHARE MODE RETURNING seat_id, state;
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seat_id state
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1 0
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2 0
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CREATE TEMPORARY TABLE t2s LIKE t1;
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INSERT INTO t2s SELECT * FROM t1 WHERE state = 0 LIMIT 2 FOR UPDATE SKIP LOCKED RETURNING seat_id, state;
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seat_id state
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3 0
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4 0
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connection default;
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CREATE TEMPORARY TABLE t2s LIKE t1;
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INSERT INTO t2s SELECT * FROM t1 WHERE state = 0 LOCK IN SHARE MODE SKIP LOCKED RETURNING seat_id, state;
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seat_id state
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1 0
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2 0
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COMMIT;
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DROP TABLE t2s;
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connection con1;
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COMMIT;
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DROP TABLE t2s;
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DROP TABLE t2;
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connection default;
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DROP TABLE t1;
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