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Editorial Team
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Asked: 2026-05-25T02:26:40+00:00

Well I’ve gotten 100+ answers to my questions on Stack Overflow, but it’s time

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Well I’ve gotten 100+ answers to my questions on Stack Overflow, but it’s time I finally registered and posted my first question!

Alright, I have a table for the users of my program and 11 tables attached to this table with 1:1 and 1:M relationships. Most of the foreign keys are set to ON UPDATE CASCADE ON DELETE RESTRICT. If I delete the center table, it allows me to, despite the foreign keys that should be in place. When I have dealt with relational databases before, I would receive these error messages:

#1217 - Cannot delete or update a parent row: a foreign key constraint fails
#1452 - Cannot add or update a child row: a foreign key constraint fails

Now mind you, this is one time I actually want error messages. I want the functionality of a relational database and all of my tables are InnoDB. Google has not helped me with this and I could not find anything in the MySQL documentation.

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1 Answer

  1. Editorial Team

    This post on the MySQL forums came close but did not detail exactly what needs to be done to fix this. Basically:

    service mysqld stop
cd /var/lib/mysql
mkdir old
mv ib* old
vim /etc/my.cnf
servie mysqld start

    For the vim, make sure innodb_buffer_pool_size, innodb_log_file_size, and innodb_log_buffer_size are set properly. Another post on the MySQL forums had a bit of misconfiguration, namely that innodb_log_file_size needs to be 25% of innodb_buffer_pool_size, so I have 16M, 4M, and 8M for these three respectively.

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