1.발생규칙
•Rowid가 조건으로 공급된 경우
•인덱스를 사용하여 Table 을 access 한경우
2.Access 방식
•Rowid를 이용해서 특정 Block의 특정 Row를 찾아간다
•가장 빠른 Access 방식이다.
3.적용범위
•max /min 일자를 찾아서 그일자에 해당하는 값을 select 할때(self join 시 사용)
4.Hint
select *
from emp
where rowid = :v_rid
-------------------------------------------------------
SELECT STATEMENT GOAL: CHOOSE
TABLE ACCESS (BY [INDEX] ROWID) OF 'EMP'
2008년 1월 31일 목요일
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