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Problem with "false" increment in InnoDB using a table with UNIQUE constraint
Posted by: Jefferson Felix
Date: April 30, 2011 12:15AM

Consider the following table Innodb:

CREATE TABLE `user` (
   `id` INT NOT NULL AUTO_INCREMENT,
   `name` VARCHAR (150) NOT NULL,
   `email` VARCHAR (50) NOT NULL,
   PRIMARY KEY (`id`),
   UNIQUE INDEX `email_UNIQUE` (`email` ASC))
ENGINE = InnoDB;

Consider the following attempts to insert:

INSERT INTO `user` (`name`, `email`) VALUES ('John', 'john@test.com');
INSERT INTO `user` (`name`, `email`) VALUES ('Joe', 'john@test.com');
INSERT INTO `user` (`name`, `email`) VALUES ('Mark', 'mark@test.com');

Obviously, the second instruction will not be inserted into database.
However, the result of
SELECT * FROM `user`;
is:

+----+-----------------------+
| id | name | email          |
+----+-----------------------+
| 1  | John | john@test.com  |
| 3  | Joe  | mark@test.com |
+----+-----------------------+

The question is: Why id "jumps" from 1 to 3? Is it a bug? A false increment? How to solve it?

Thanks,
Jefferson dos Santos Felix



Edited 1 time(s). Last edit at 04/30/2011 12:19AM by Jefferson Felix.

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Problem with "false" increment in InnoDB using a table with UNIQUE constraint
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