오라클 HINT Optimization Approaches and Goals – Optimization 접근과 목적 /*+ ALL_ROWS */ ALL_ROWS는 Full Table Scan을 선호하며 CBO(Cost Based Optimization)는 default로 ALL_ROWS를 선택 합니다. SQL>SELECT /*+ ALL_ROWS */ ename, hiredate FROM emp WHERE ename like ’%%%’ Execution Plan … Continue reading →