Question

This statement “hangs” the server:

DELETE FROM StockPositions WHERE machineName LIKE 'P%';

and

DELETE FROM StockPositions WHERE machineName LIKE 'P%' LIMIT 1;

EDIT: This actually DOES work! I will continue to test when it fails. I’m leaning towards some kind of locking issue anyway…

The corresponding SELECT-statements work as expected (returning 500 rows).

This statement works fine:

DELETE FROM StockPositions WHERE ID = 5226;

• No foreign key cascade tables deletes. EDIT: Wrong! See my answer below.
• No triggers.
• No locks (appearantly).
• No ideas.

Any ideas what to look for?

(No panic – I can solve this by workarounds but I’d really want to know what’s going on!)

EDIT:

CREATE TABLE `StockPositions` (
   `ID` int(10) unsigned NOT NULL AUTO_INCREMENT,
   `isEnabled` tinyint(1) DEFAULT NULL,
   `readableName` varchar(32) NOT NULL,
   `machineName` varchar(32) NOT NULL,
   `longName` varchar(64) DEFAULT NULL,
   `accessibilityLevel` int(10) unsigned NOT NULL,
   `storey` char(1) DEFAULT NULL,
   `lengthX` decimal(10,3) unsigned DEFAULT NULL,
   `lengthY` decimal(10,3) unsigned DEFAULT NULL,
   `lengthZ` decimal(10,3) unsigned DEFAULT NULL,
   `positionType` varchar(50) DEFAULT NULL,
   `type` int(11) DEFAULT NULL,
   `frequency` int(11) DEFAULT NULL,
   `module` varchar(10) DEFAULT NULL,
   `prioritized` tinyint(4) DEFAULT NULL,
   `aisleID` int(10) DEFAULT NULL,
   PRIMARY KEY (`ID`),
   UNIQUE KEY `readableName` (`readableName`),
   UNIQUE KEY `machineName` (`machineName`)
) ENGINE=InnoDB AUTO_INCREMENT=11820 DEFAULT CHARSET=utf8

Answer 1

Sorry! * blushing *
The DELETE CASCADE is found in the child-table (not the parent).
Good to know. Thank you for you time and effort!