Folks,

I've had a database running for months now and
suddenly, when inserting into table 'HEARTBEAT_COUNTS'
(desc below), I get an error:

Error - Duplicate key '444642', -1
(The syntax of the error message is not exact)

My insert statement does not include a value for 'id'
which is an auto_increment field.

The table has about 390,000 rows.  

Please help -- I'll answer any question ASAP as I
really want to understand why this happened.

I have temporarily dropped the table and created a new
one and the problem disappeared -- but I want to learn
why it happened and how I can prevent it.

Thank you very much.

--

CREATE TABLE `heartbeat_counts` (  
`id` int(10) unsigned NOT NULL auto_increment,
`received_responses` smallint(5) unsigned NOT NULL
default '0', `device_response` bigint(20) unsigned NOT
NULL default '0', 
PRIMARY KEY (`id`) 
) TYPE=MyISAM ;

example insert:

INSERT INTO heartbeat_counts set received_responses=1,
device_response=12951 ;



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