Oracle Insert TX-Lock 발생 링크 - https://uhesse.com/2017/11/27/why-insert-causes-tx-row-lock-contention-or-tm-contention-in-oracle/ ## SESSION 1TEST> create table check_lock ( a1 number, a2 varchar2(100)); Table created.TEST> create unique index xuk_check_lock on check_lock ( a2 ); Index created.TEST> insert into check_lock values ( 1, 'a');1 row created.TEST> ## SESSION 2TEST> insert into check_lo..