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Consider installing CiviCRM 5.13.1 and enabling multiple MySQL locks. See https://github.com/civicrm/civicrm-core/pull/13854 for details.


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Instead of trying to "hide" the problem when it happens, it might be safer/wiser to try to prevent it. I like smartgroups and how powerful they are, but I found that it works better if I cache the results for a while (eg. a day) and rebuild the smart groups via the jobs. Would it be acceptable to keep a "stalled" version of your groups for a while and ...


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