Good old C programmers (like me) immediately can see something suspicious about the number 65535 – instant flag that somebody’s used a short where a long was wanted. (Back in the days when a short was 16 bits… I am dating myself here).
In any case, this has been going on for too long with my Magento install and I finally tracked the darn thing down. The problem as noted here, in Magento 188.8.131.52-rc1 release notes, fix #17720. While it’s been fixed in a newer release, do you think there’s a snowball’s chance in Hades that I’m upgrading my production server before the holiday season is over?
The error messages is displayed (in our particular case) when updating products. It reads “SQLSTATE: Integrity constraint violation: 1062 Duplicate entry ’65535′ for key 1″, and the screen looks (partially) like this:
The Magento table “core_flag” has a flag_id field defined as (you guessed it) a small int. So, I used phpMyAdmin (I’m hosted on nexcess) to alter the field to a … ta-da! … a BIG INT:
ALTER TABLE `core_flag` CHANGE `flag_id` `flag_id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT
Your Mileage May Vary
As always, remember what you paid for this advice, and be sure to test it out on your Test Server!
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In tracking the problem down, Nexcess advised me to review this document, which, while it didn’t fix the problem, did help me get some performance improvements and a better understanding of Magentos Import/ Export issues.