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From:spameden Date:March 12 2013 9:34pm
Subject:auto_increment field behavior
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Hi, I'm running MySQL-5.5 on Ubuntu

~ $ mysqld -V
mysqld  Ver 5.5.29-0ubuntu0.12.04.2 for debian-linux-gnu on x86_64 ((Ubuntu))

Would like to know if it's normal behavior with auto_increment field
(tried both signed and unsigned now):

mysql> show create table phone_codes;
+-------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table       | Create Table








  |
+-------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| phone_codes | CREATE TABLE `phone_codes` (
  `pc_id` int(11) NOT NULL AUTO_INCREMENT,
  `pc_type` enum('ABC','DEF') DEFAULT NULL,
  `pc_code` decimal(3,0) NOT NULL,
  `pc_from` decimal(7,0) NOT NULL,
  `pc_to` decimal(7,0) NOT NULL,
  `pc_capacity` decimal(8,0) NOT NULL,
  `pc_operator` varchar(255) DEFAULT NULL,
  `pc_city` varchar(255) DEFAULT NULL,
  `pc_region` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`pc_id`),
  KEY `pc_code` (`pc_code`),
  KEY `pc_code_from_to` (`pc_code`,`pc_from`,`pc_to`),
  KEY `pc_operator` (`pc_operator`),
  KEY `pc_city` (`pc_city`),
  KEY `pc_region` (`pc_region`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 |
+-------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

mysql> load data infile '/tmp/ABC3x' into table phone_codes fields
terminated by ';' enclosed by '#' lines terminated by '\r\n'
(pc_code,pc_from,pc_to,pc_capacity,pc_operator,pc_city,pc_region) SET
pc_type='ABC';
Query OK, 17922 rows affected (4.44 sec)
Records: 17922  Deleted: 0  Skipped: 0  Warnings: 0

mysql> show create table phone_codes;
+-------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table       | Create Table








                       |
+-------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| phone_codes | CREATE TABLE `phone_codes` (
  `pc_id` int(11) NOT NULL AUTO_INCREMENT,
  `pc_type` enum('ABC','DEF') DEFAULT NULL,
  `pc_code` decimal(3,0) NOT NULL,
  `pc_from` decimal(7,0) NOT NULL,
  `pc_to` decimal(7,0) NOT NULL,
  `pc_capacity` decimal(8,0) NOT NULL,
  `pc_operator` varchar(255) DEFAULT NULL,
  `pc_city` varchar(255) DEFAULT NULL,
  `pc_region` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`pc_id`),
  KEY `pc_code` (`pc_code`),
  KEY `pc_code_from_to` (`pc_code`,`pc_from`,`pc_to`),
  KEY `pc_operator` (`pc_operator`),
  KEY `pc_city` (`pc_city`),
  KEY `pc_region` (`pc_region`)
) ENGINE=InnoDB AUTO_INCREMENT=32768 DEFAULT CHARSET=utf8 |
+-------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

NOTE: AUTO_INCREMENT is 32768 instead of 17923 ! So next inserted row
would have pc_id=32768.

Please suggest if it's normal behavior or not.

Many thanks.
Thread
auto_increment field behaviorspameden12 Mar
  • Re: auto_increment field behaviorReindl Harald12 Mar
    • Re: auto_increment field behaviorspameden12 Mar
      • Re: auto_increment field behaviorspameden12 Mar
  • RE: auto_increment field behaviorRick James12 Mar
    • Re: auto_increment field behaviorspameden12 Mar
      • RE: auto_increment field behaviorRick James12 Mar
        • Re: auto_increment field behaviorspameden12 Mar
          • Re: auto_increment field behaviorspameden12 Mar
            • Re: auto_increment field behaviorspameden12 Mar
              • Re: auto_increment field behaviorspameden12 Mar