ORACLE 테이블스페이스
DB CAFE
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- DBA { Oracle DBA 명령어 > DBA 초급 과정 > DBA 고급 과정 }
- 튜닝 { 오라클 튜닝 목록 }
- 모델링 { 데이터 모델링 가이드 }
테이블 스페이스[편집]
1 테이블스페이스별 파일 목록을 보기
SELECT SUBSTRB(TABLESPACE_NAME, 1, 10) AS "테이블스페이스"
, SUBSTRB(FILE_NAME, 1, 50) AS "파일명"
, TO_CHAR(BLOCKS, '999,999,990') AS "블럭수"
, TO_CHAR(BYTES, '99,999,999') AS "크기"
FROM DBA_DATA_FILES ORDER BY TABLESPACE_NAME, FILE_NAME;
2 테이블스페이스별 정보 보기
SELECT A.TABLESPACE_NAME AS "TABLESPACE"
, A.INITIAL_EXTENT / 1024 AS "INIT(K)"
, A.NEXT_EXTENT / 1024 AS "NEXT(K)"
, A.MIN_EXTENTS AS "MIN"
, A.MAX_EXTENTS AS "MAX"
, A.PCT_INCREASE AS "PCT_INC(%)"
, B.FILE_NAME AS "FILE_NAME"
, B.BLOCKS * C.VALUE / 1024 / 1024 AS "SIZE(M)"
, B.STATUS AS "STATUS"
FROM DBA_TABLESPACES A
, DBA_DATA_FILES B
, V$PARAMETER C
WHERE A.TABLESPACE_NAME = B.TABLESPACE_NAME AND C.NAME = 'db_block_size' ORDER BY 1, 2;
3 테이블스페이스별 사용하는 파일의 크기 합 보기
SELECT SUBSTRB(TABLESPACE_NAME, 1, 10) AS TABLESPACE
, TO_CHAR(SUM(BYTES), '9,999,999,999,990') AS BYTES
, TO_CHAR(SUM(BLOCKS), '9,999,999,990') AS BLOCKS
FROM DBA_DATA_FILES GROUP BY TABLESPACE_NAME UNION ALL SELECT '총계', TO_CHAR(SUM(BYTES), '9,999,999,999,990') AS BYTES, TO_CHAR(SUM(BLOCKS), '9,999,999,990') AS BLOCKS FROM DBA_DATA_FILES;
4 테이블스페이스별 디스크 사용량 보기
SELECT A.TABLESPACE_NAME AS "TABLESPACE"
, A.INIT AS "INIT(K)"
, A.NEXT AS "NEXT(K)"
, A.MIN AS "MIN"
, A.MAX AS "MAX"
, A.PCT_INC AS "PCT_INC(%)"
, TO_CHAR(B.TOTAL, '999,999,999,990') AS "총량(바이트)"
, TO_CHAR(C.FREE, '999,999,999,990') AS "남은량(바이트)"
, TO_CHAR(B.BLOCKS, '9,999,990') AS "총블럭"
, TO_CHAR(D.BLOCKS, '9,999,990') AS "사용블럭"
, TO_CHAR(100 * NVL(D.BLOCKS, 0) / B.BLOCKS, '999.99') AS "사용율%"
FROM (SELECT TABLESPACE_NAME
, INITIAL_EXTENT / 1024 AS INIT
, NEXT_EXTENT / 1024 AS NEXT
, MIN_EXTENTS AS MIN
, MAX_EXTENTS AS MAX
, PCT_INCREASE AS PCT_INC
FROM DBA_TABLESPACES) A
, (SELECT TABLESPACE_NAME, SUM(BYTES) AS TOTAL, SUM(BLOCKS) AS BLOCKS
FROM DBA_DATA_FILES
GROUP BY TABLESPACE_NAME) B
, (SELECT TABLESPACE_NAME, SUM(BYTES) AS FREE
FROM DBA_FREE_SPACE
GROUP BY TABLESPACE_NAME) C
, (SELECT TABLESPACE_NAME, SUM(BLOCKS) AS BLOCKS
FROM DBA_EXTENTS
GROUP BY TABLESPACE_NAME) D
WHERE A.TABLESPACE_NAME = B.TABLESPACE_NAME(+) AND A.TABLESPACE_NAME = C.TABLESPACE_NAME(+) AND A.TABLESPACE_NAME = D.TABLESPACE_NAME(+) ORDER BY A.TABLESPACE_NAME;
5 테이블스페이스의 테이블 명 보기
SELECT TABLESPACE_NAME, TABLE_NAME FROM USER_TABLES WHERE TABLESPACE_NAME = UPPER('&테이블스페이스명') ORDER BY TABLESPACE_NAME, TABLE_NAME;
6 공간의 90% 이상을 사용하고 있는 Tablespace
SELECT X.TABLESPACE_NAME
, TOTAL_SIZE / 1024 / 1024 TOTAL_SIZE
, USED_SIZE / 1024 / 1024 USED_SIZE
, (ROUND(USED_SIZE / TOTAL_SIZE, 2)) * 100 USED_RATIO
FROM (SELECT TABLESPACE_NAME, SUM(BYTES) TOTAL_SIZE
FROM DBA_DATA_FILES
GROUP BY TABLESPACE_NAME) X
, (SELECT TABLESPACE_NAME, SUM(BYTES) USED_SIZE
FROM DBA_EXTENTS
GROUP BY TABLESPACE_NAME) Y
WHERE X.TABLESPACE_NAME = Y.TABLESPACE_NAME(+) AND Y.USED_SIZE > .9 * X.TOTAL_SIZE;
7 Object별 테이블스페이스 및 데이터파일
SELECT DISTINCT E.SEGMENT_NAME, E.TABLESPACE_NAME, F.FILE_NAME
FROM DBA_EXTENTS E
, DBA_DATA_FILES F
WHERE E.FILE_ID = F.FILE_ID AND E.SEGMENT_TYPE = 'TABLE' AND E.TABLESPACE_NAME NOT IN ('SYSTEM', 'TOOLS');
8 Tablespace별 Table, Index 개수
SELECT OWNER
, TABLESPACE_NAME
, SUM(DECODE(SEGMENT_TYPE, 'TABLE', 1, 0))
, SUM(DECODE(SEGMENT_TYPE, 'INDEX', 1, 0))
FROM DBA_SEGMENTS WHERE SEGMENT_TYPE IN ('TABLE', 'INDEX') GROUP BY OWNER, TABLESPACE_NAME;
9 위치별 space를 아는 방법
SELECT SUBSTRB(A.FILE_NAME, 1, 40) AS FILE_NAME
, A.FILE_ID
, B.FREE_BYTES / 1024 AS FREE_BYTES
, B.MAX_BYTES / 1024 AS MAX_BYTES
FROM DBA_DATA_FILES A
, (SELECT FILE_ID, SUM(BYTES) AS FREE_BYTES, MAX(BYTES) AS MAX_BYTES
FROM DBA_FREE_SPACE
GROUP BY FILE_ID) B
WHERE A.FILE_ID = B.FILE_ID AND A.TABLESPACE_NAME = UPPER('&테이블스페이스명') ORDER BY A.FILE_NAME;
10 현재 Extension 횟수가 MaxExtents의 80% 이상인 경우
SELECT TABLESPACE_NAME
, OWNER
, SEGMENT_NAME
, SEGMENT_TYPE
, EXTENTS
, MAX_EXTENTS
FROM SYS.DBA_SEGMENTS S WHERE EXTENTS / MAX_EXTENTS > .8 AND MAX_EXTENTS > 0 ORDER BY TABLESPACE_NAME, OWNER, SEGMENT_NAME;
11 테이블의 익스텐트 정보 조회
/*
오라클에서 스토리지 구조는 아래와 같다.
테이블 스페이스 -> 세그먼트 -> 익스텐트 -> 블록 -> OS 범위 -> 데이터 파일 -> 운영체제 블록
세그먼트의 이름,
해당 세그먼트의 최대 익스텐트 개수,
익스텐트 아이디
해당 세그먼트의 최대 익스텐트 개수 - 최대 익스텐트 아이디
딕셔너리 관리 테이블스페이스로 생성한 것으로 조회를 한다.
*/
SELECT B.SEGMENT_NAME
, B.MAX_EXTENTS
, MAX(C.EXTENT_ID) AS EXTENT_ID
, B.MAX_EXTENTS - MAX(C.EXTENT_ID) AS DIFF
FROM USER_TABLESPACES A
, USER_SEGMENTS B
, USER_EXTENTS C
WHERE A.EXTENT_MANAGEMENT = 'DICTIONARY' AND B.TABLESPACE_NAME = A.TABLESPACE_NAME AND C.SEGMENT_NAME = B.SEGMENT_NAME GROUP BY B.SEGMENT_NAME, B.MAX_EXTENTS HAVING B.MAX_EXTENTS - MAX(C.EXTENT_ID) <= 50 ORDER BY B.MAX_EXTENTS - MAX(C.EXTENT_ID);
12 ROLLBACK SEGMENT의 사용상황 보기
--: EXTENTS = 현재 할당된 EXTENT의 수 --: EXTENDS = 마지막 트랜잭션에 의해 할당된 EXTENT의 수
SELECT SUBSTRB(A.SEGMENT_NAME, 1, 10) AS SEGMENT_NAME
, SUBSTRB(A.TABLESPACE_NAME, 1, 10) AS TABLESPACE_NAME
, TO_CHAR(A.SEGMENT_ID, '99,999') AS SEG_ID
, TO_CHAR(A.MAX_EXTENTS, '999,999') AS MAX_EXT
, TO_CHAR(B.EXTENTS, '999,999') AS EXTENTS
, TO_CHAR(B.EXTENDS, '999,999') AS EXTENDS
, TO_CHAR((A.INITIAL_EXTENT + (B.EXTENTS - 1) * A.NEXT_EXTENT) / 1000000, '9,999.999') AS "ALLOC(MB)"
, TO_CHAR(XACTS, '9,999') AS XACTS
FROM DBA_ROLLBACK_SEGS A
, V$ROLLSTAT B
WHERE A.SEGMENT_ID = B.USN(+) ORDER BY 1;