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Re: mysql 5.6.26 high concurrency dead lock
Posted by: Peter Brawley
Date: May 31, 2019 12:02PM

> (`code`,`data_key`,`create_time`) is unique key´╝îis to prevent data duplication.

Yes, therefore the ( code ) key is redundant.

> What lock does transaction 1 hold?
> Why transaction 2 is waiting for transaction 1 ?

Perhaps someone more familiar with innodb innards can answer that.

What you must realise, though, is that such deadlocks are inevitable on a busy system. To minimise their impact (i) keep transactions small & simple, (ii) code transactions to retry when deadlock occurs.

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Re: mysql 5.6.26 high concurrency dead lock
May 31, 2019 12:02PM

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