ORACLE 인덱스
DB CAFE
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- DBA { Oracle DBA 명령어 > DBA 초급 과정 > DBA 고급 과정 }
- 튜닝 { 오라클 튜닝 목록 }
- 모델링 { 데이터 모델링 가이드 }
인덱스 정보[편집]
-
- 13 INDEX 보기
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;-
- 14 전체 INDEX 보기
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;-
- 15 특정 테이블의 인덱스 확인
/*
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;
-
- 16 인덱스에 대한 컬럼 조회
SELECT TABLE_NAME
, INDEX_NAME
, COLUMN_POSITION
, COLUMN_NAME
FROM USER_IND_COLUMNS ORDER BY TABLE_NAME, INDEX_NAME, COLUMN_POSITION;-
- 17 PRIMARY KEY 재생성 방법
--- 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;-
- 18 PRIMARY KEY를 REFERENCE 하는 FOREIGN KEY 찾기
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#;-
- 19 중복인덱스 체크
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#;-
- 20 테이블의 PK를 구성하는 컬럼 조회
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';-
- 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;
-
- 51 인덱스의 Delete Space 조회
SELECT NAME
, LF_ROWS<br/> , DEL_LF_ROWS<br/> , (DEL_LF_ROWS / LF_ROWS) * 100 AS "DELETE SPACE%"
FROM INDEX_STATS WHERE NAME = UPPER('&INDEX_NAME');
--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;