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Upgrade to Percona 5.6.30,something happened

linyuelinyue ContributorCurrent User Role Novice
After I upgrade to Percona 5.6.30,my long_query_time set 1s, in slow log many "# administrator command: Prepare;" occured , it cost 1-3s . And “SELECT @@session.tx_isolation;" "SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED;" also occur similarly . I want to know why "# administrator command: Prepare;" cost much time ? is it mysql bug ?
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