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For op_lock and op_nwgrp_work tables engine is MEMORY, not sure of the reason. Was there any perf. issues addressed? These exists since the start.
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Yes, they have existed since 4.0. I checked git history, I think there is nothing specific to this table, they can be migrated to InnoDB. I'm running a local 4.9.0 CloudStack environment with these changes and it is working alright.