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並前往https://www.percona.com/blog/2017/09/25/avoid-shared-locks-from-subqueries-when-possible/

Avoid Shared Locks from Subqueries When Possible - Percona

update ibreg set k=1 where id in (select id from ibcmp where id > 90000);. This query, when executed with autocommit=1, is normally harmless.

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