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mysql update语句问题

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Release： 2016-06-06 09:45:11
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mysqlupdate

如题，下面是我的写的一段SQL，为什么运行时很卡，最后超出时间无法执行了？
update overseas_contract_material set executedNum = executedNum-12 where contractId = 'ef556813-e5ae-e5a9-9157-f91f963ee570' and materialId = '184';

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