MySQL--索引失效行锁变表锁、间隙锁的危害、如何锁定一行

小鱼儿 2021-08-13 12:14 466阅读 0赞

**建表及准备数据：**

CREATE TABLE `test_innodb_lock`(
    a INT(11),
    b VARCHAR(16)
    )ENGINE INNODB;
    
    INSERT INTO test_innodb_lock values(1, 'b2');
    INSERT INTO test_innodb_lock values(3, '3');
    INSERT INTO test_innodb_lock values(4, '4000');
    INSERT INTO test_innodb_lock values(5, '5000');
    INSERT INTO test_innodb_lock values(6, '6000');
    INSERT INTO test_innodb_lock values(7, '7000');
    INSERT INTO test_innodb_lock values(8, '8000');
    INSERT INTO test_innodb_lock values(9, '9000');
    INSERT INTO test_innodb_lock values(1, 'b1');
    
    CREATE INDEX test_innodb_a_ind on test_innodb_lock(a);
    
    CREATE INDEX test_innodb_lock_b_ind on test_innodb_lock(b);

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