ORACLE 인덱스
DB CAFE
- DBA { Oracle DBA 명령어 > DBA 초급 과정 > DBA 고급 과정 }
- 튜닝 { 오라클 튜닝 목록 }
- 모델링 { 데이터 모델링 가이드 }
인덱스 정보[편집]
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- 13 INDEX 보기
<syntaxhighlight lang="sql">
SELECT A.INDEX_NAME
, A.UNIQUENESS , TO_CHAR(COLUMN_POSITION, '999') AS POS , SUBSTRB(COLUMN_NAME, 1, 33) AS COLUMN_NAME
FROM USER_INDEXES A
, USER_IND_COLUMNS B
WHERE A.INDEX_NAME = B.INDEX_NAME AND A.TABLE_OWNER = UPPER('E_LUCIS') AND A.TABLE_NAME = UPPER('&테이블명') ORDER BY 1, 3; </syntaxhighlight>
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- 14 전체 INDEX 보기
<syntaxhighlight lang="sql">
SELECT SUBSTRB(A.TABLE_NAME, 1, 22) AS TABLE_NAME
, SUBSTRB(A.INDEX_NAME, 1, 23) AS INDEX_NAME , SUBSTRB(A.UNIQUENESS, 1, 7) AS UNIQUE , TO_CHAR(COLUMN_POSITION, '999') AS POS , SUBSTRB(COLUMN_NAME, 1, 20) AS COLUMN_NAME
FROM DBA_INDEXES A
, DBA_IND_COLUMNS B
WHERE A.INDEX_NAME = B.INDEX_NAME AND A.TABLE_OWNER = B.TABLE_OWNER AND A.TABLE_OWNER = 'E_LUCIS' ORDER BY 1, 2, 3; </syntaxhighlight>
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- 15 특정 테이블의 인덱스 확인
<syntaxhighlight lang="sql">
/*
인덱스를 확인 하고자 할때 사용하는 쿼리
- /
SELECT C.TABLE_NAME
, C.INDEX_NAME , C.COLUMN_NAME , C.COLUMN_POSITION , T.NUM_ROWS
FROM ALL_IND_COLUMNS C
, (SELECT TABLE_NAME, NUM_ROWS FROM ALL_TABLES WHERE OWNER = 'ESTDBA' AND TABLE_NAME IN (SELECT TABLE_NAME FROM USER_TABLES WHERE TABLE_NAME LIKE:IN_TABLE_NAME || '%') AND NUM_ROWS > 0) T
WHERE C.TABLE_NAME = T.TABLE_NAME ORDER BY T.NUM_ROWS DESC, C.TABLE_NAME, C.INDEX_NAME, C.COLUMN_POSITION; </syntaxhighlight>
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- 16 인덱스에 대한 컬럼 조회
<syntaxhighlight lang="sql"> SELECT TABLE_NAME
, INDEX_NAME , COLUMN_POSITION , COLUMN_NAME
FROM USER_IND_COLUMNS ORDER BY TABLE_NAME, INDEX_NAME, COLUMN_POSITION; </syntaxhighlight>
-
- 17 PRIMARY KEY 재생성 방법
<syntaxhighlight lang="sql"> --- PRIMARY KEY DROP
ALTER TABLE EMP DROP PRIMARY KEY;
-- PRIMARY KEY 생성 ALTER TABLE EMP ADD CONSTRAINT EMP_PK PRIMARY KEY(EMPNO) USING INDEX STORAGE(INITIAL 1M NEXT 1M PCTINCREASE 0) TABLESPACE USERS; </syntaxhighlight>
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- 18 PRIMARY KEY를 REFERENCE 하는 FOREIGN KEY 찾기
<syntaxhighlight lang="sql"> SELECT C.NAME CONSTRAINT_NAME FROM DBA_OBJECTS A
, CDEF$ B , CON$ C
WHERE A.OBJECT_NAME = UPPER('&테이블명') AND A.OBJECT_ID = B.ROBJ# AND B.CON# = C.CON#; </syntaxhighlight>
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- 19 중복인덱스 체크
<syntaxhighlight lang="sql"> SELECT O1.NAME || '.' || N1.NAME REDUNDANT_INDEX, O2.NAME || '.' || N2.NAME SUFFICIENT_INDEX FROM SYS.ICOL$ IC1
, SYS.ICOL$ IC2 , SYS.IND$ I1 , SYS.OBJ$ N1 , SYS.OBJ$ N2 , SYS.USER$ O1 , SYS.USER$ O2
WHERE IC1.POS# = 1 AND IC2.BO# = IC1.BO# AND IC2.OBJ#!= IC1.OBJ# AND IC2.POS# = 1 AND IC2.INTCOL# = IC1.INTCOL# AND I1.OBJ# = IC1.OBJ# AND BITAND(I1.PROPERTY, 1) = 0 AND (SELECT MAX(POS#) * (MAX(POS#) + 1) / 2
FROM SYS.ICOL$ WHERE OBJ# = IC1.OBJ#) = (SELECT SUM(XC1.POS#) FROM SYS.ICOL$ XC1 , SYS.ICOL$ XC2 WHERE XC1.OBJ# = IC1.OBJ# AND XC2.OBJ# = IC2.OBJ# AND XC1.POS# = XC2.POS# AND XC1.INTCOL# = XC2.INTCOL#)
AND N1.OBJ# = IC1.OBJ# AND N2.OBJ# = IC2.OBJ# AND O1.USER# = N1.OWNER# AND O2.USER# = N2.OWNER#; </syntaxhighlight>
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- 20 테이블의 PK를 구성하는 컬럼 조회
<syntaxhighlight lang="sql"> SELECT A.TABLE_NAME, B.CONSTRAINT_NAME, C.COLUMN_NAME FROM USER_TABLES A
, USER_CONSTRAINTS B , USER_CONS_COLUMNS C
WHERE A.TABLE_NAME = B.TABLE_NAME AND B.CONSTRAINT_NAME = C.CONSTRAINT_NAME AND B.CONSTRAINT_TYPE = 'P'; </syntaxhighlight>
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- 21 Index가 없는 Table 조회
<syntaxhighlight lang="sql"> SELECT OWNER, TABLE_NAME FROM (SELECT OWNER, TABLE_NAME
FROM DBA_TABLES MINUS SELECT TABLE_OWNER, TABLE_NAME FROM DBA_INDEXES)
WHERE OWNER NOT IN ('SYS', 'SYSTEM') ORDER BY OWNER, TABLE_NAME; </syntaxhighlight>
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- 51 인덱스의 Delete Space 조회
<syntaxhighlight lang="sql">
SELECT NAME
, LF_ROWS
, DEL_LF_ROWS
, (DEL_LF_ROWS / LF_ROWS) * 100 AS "DELETE SPACE%"
FROM INDEX_STATS WHERE NAME = UPPER('&INDEX_NAME'); </syntaxhighlight>
--Delete Space% 값이 20% 가 넘으면, 그 인덱스는 다시 작성하는 것이 좋다.
- 21 Index가 없는 Table 조회
SELECT OWNER, TABLE_NAME FROM (SELECT OWNER, TABLE_NAME
FROM DBA_TABLES
MINUS
SELECT TABLE_OWNER, TABLE_NAME
FROM DBA_INDEXES)
WHERE OWNER NOT IN ('SYS', 'SYSTEM') ORDER BY OWNER, TABLE_NAME;