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From:Gavin Towey Date:May 14 2010 5:44pm
Subject:RE: Can't create foreign key
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Perror 121 says:
OS error code 121:  Remote I/O error

Which I'm not too sure why an ALTER to add an constraint would give that error.

Normally though, foreign key errors are shown in the SHOW ENGINE INNODB STATUS \G output,
look for more details there.

Gavin Towey

-----Original Message-----
From: jc@stripped [mailto:jc@stripped]
Sent: Friday, May 14, 2010 10:18 AM
To: mysql@stripped
Subject: Can't create foreign key

I'm trying to create a foreign key by executing the following statement:

ALTER TABLE `cc`.`takenlessons`

  ADD CONSTRAINT `fk_lessons`

  FOREIGN KEY (`LessonID` )

  REFERENCES `cc`.`lessons` (`id` )



, ADD INDEX `fk_lessons` (`LessonID` ASC) ;

I'm using the RC of MySQL workbench to do this. When I execute this
statement, I get the following error:

Error Code: 1005

Can't create table 'cc.#sql-115c_61' (errno: 121))

In the past when I got a similar error, it was because the fields didn't
match exactly. For instance, one may be Int(10) and one Int(11), or one may
be Unsigned, and the other not.  But, in this case, both match exactly.
What other reasons are there for a foreign key creation to fail like that?



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Can't create foreign keyjc14 May
  • RE: Can't create foreign keyGavin Towey14 May
    • RE: Can't create foreign keyjc14 May
  • Re: Can't create foreign keyCarsten Pedersen14 May
    • RE: Can't create foreign keyjc14 May
      • Re: Can't create foreign keyPrabhat Kumar14 May