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I'm having the following exception on EE 1.13.1

Zend_Db_Statement_Exception' with message 'SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry 'xxxxxxx' for key '5B1C775075460366570ABDA2839BC68A' in /lib/Zend/Db/Statement/Pdo.php:234

It looks something goes wrong with the Category Rules index:

  1. According to the exception information the issue starts from app/code/core/Enterprise/TargetRule/Model/Resource/Index/Abstract.php(213)
  2. key 5B1C775075460366570ABDA2839BC68A is actually an index of this table enterprise_targetrule_index_related

Any Idea ?
I'm actually debugging the above issue and I will share more info if I find something.

UPDATE

I have provided a solution below. It will be great if someone with more experience can confirm if try catch is fine ( usually it is not advisable to use try catch in the business logic ) or transaction is better.

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Line 213 that trigger the exception is the one that try to do the INSERT

An initial SELECT check if a record with $targetruleId exist, if not Magento try to INSERT it. In some occasion (maybe because some concurrent access to the same page) a record is created, just after the select, just before the insert ...

If you need a official fix Magento has has patch for it.

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