部分转自 https://www.cnblogs.com/xwdreamer/p/3511047.html
--查询表空间使用情况
SELECT UPPER(F.TABLESPACE_NAME) "表空间名",
D.TOT_GROOTTE_MB "表空间大小(M)",
D.TOT_GROOTTE_MB - F.TOTAL_BYTES "已使用空间(M)",
TO_CHAR(ROUND((D.TOT_GROOTTE_MB - F.TOTAL_BYTES) / D.TOT_GROOTTE_MB * 100,
2),
'990.99') || '%' "使用比",
F.TOTAL_BYTES "空闲空间(M)",
F.MAX_BYTES "最大块(M)"
FROM (SELECT TABLESPACE_NAME,
ROUND(SUM(BYTES) / (1024 * 1024), 2) TOTAL_BYTES,
ROUND(MAX(BYTES) / (1024 * 1024), 2) MAX_BYTES
FROM SYS.DBA_FREE_SPACE
GROUP BY TABLESPACE_NAME) F,
(SELECT DD.TABLESPACE_NAME,
ROUND(SUM(DD.BYTES) / (1024 * 1024), 2) TOT_GROOTTE_MB
FROM SYS.DBA_DATA_FILES DD
GROUP BY DD.TABLESPACE_NAME) D
WHERE D.TABLESPACE_NAME = F.TABLESPACE_NAME
ORDER BY 4 DESC, 5 ASC;
--查询表空间的free space
SELECT TABLESPACE_NAME,
COUNT(*) AS EXTENDS,
ROUND(SUM(BYTES) / 1024 / 1024, 2) AS MB,
SUM(BLOCKS) AS BLOCKS
FROM DBA_FREE_SPACE
GROUP BY TABLESPACE_NAME
ORDER BY 3 ASC;
--查询表空间的总容量
SELECT TABLESPACE_NAME, SUM(BYTES) / 1024 / 1024 AS MB
FROM DBA_DATA_FILES
GROUP BY TABLESPACE_NAME
ORDER BY 2 DESC;
--查询表空间使用率
SELECT TOTAL.TABLESPACE_NAME,
ROUND(TOTAL.MB, 2) AS TOTAL_MB,
ROUND(TOTAL.MB - FREE.MB, 2) AS USED_MB,
ROUND((1 - FREE.MB / TOTAL.MB) * 100, 2) || '%' AS USED_PCT
FROM (SELECT TABLESPACE_NAME, SUM(BYTES) / 1024 / 1024 AS MB
FROM DBA_FREE_SPACE
GROUP BY TABLESPACE_NAME) FREE,
(SELECT TABLESPACE_NAME, SUM(BYTES) / 1024 / 1024 AS MB
FROM DBA_DATA_FILES
GROUP BY TABLESPACE_NAME) TOTAL
WHERE FREE.TABLESPACE_NAME = TOTAL.TABLESPACE_NAME
ORDER BY 4 DESC;
SELECT A.TABLESPACE_NAME "表空间名",
TOTAL "表空间大小",
FREE "表空间剩余大小",
(TOTAL - FREE) "表空间使用大小",
ROUND((TOTAL - FREE) / TOTAL, 4) * 100 "使用率 %"
FROM (SELECT TABLESPACE_NAME, SUM(BYTES) FREE
FROM DBA_FREE_SPACE
GROUP BY TABLESPACE_NAME) A,
(SELECT TABLESPACE_NAME, SUM(BYTES) TOTAL
FROM DBA_DATA_FILES
GROUP BY TABLESPACE_NAME) B
WHERE A.TABLESPACE_NAME = B.TABLESPACE_NAME
ORDER BY 5 DESC ;
SELECT TABLESPACE_NAME "表空间",
TO_CHAR(ROUND(BYTES / 1024, 2), '99990.00') || '' "实有",
TO_CHAR(ROUND(FREE / 1024, 2), '99990.00') || 'G' "现有",
TO_CHAR(ROUND((BYTES - FREE) / 1024, 2), '99990.00') || 'G' "使用",
TO_CHAR(ROUND(10000 * USED / BYTES) / 100, '99990.00') || '%' "使用比例"
FROM (SELECT A.TABLESPACE_NAME TABLESPACE_NAME,
FLOOR(A.BYTES / (1024 * 1024)) BYTES,
FLOOR(B.FREE / (1024 * 1024)) FREE,
FLOOR((A.BYTES - B.FREE) / (1024 * 1024)) USED
FROM (SELECT TABLESPACE_NAME TABLESPACE_NAME, SUM(BYTES) BYTES
FROM DBA_DATA_FILES
GROUP BY TABLESPACE_NAME) A,
(SELECT TABLESPACE_NAME TABLESPACE_NAME, SUM(BYTES) FREE
FROM DBA_FREE_SPACE
GROUP BY TABLESPACE_NAME) B
WHERE A.TABLESPACE_NAME = B.TABLESPACE_NAME)
--WHERE TABLESPACE_NAME LIKE 'CDR%' --这一句用于指定表空间名称
ORDER BY FLOOR(10000 * USED / BYTES) DESC;
SELECT TABLESPACE_NAME,
MAX_GB,
USED_GB,
ROUND(100 * USED_GB / MAX_GB) PCT_USED
FROM (SELECT A.TABLESPACE_NAME TABLESPACE_NAME,
ROUND((A.BYTES_ALLOC - NVL(B.BYTES_FREE, 0)) / POWER(2, 30),
2) USED_GB,
ROUND(A.MAXBYTES / POWER(2, 30), 2) MAX_GB
FROM (SELECT F.TABLESPACE_NAME,
SUM(F.BYTES) BYTES_ALLOC,
SUM(DECODE(F.AUTOEXTENSIBLE,
'YES',
F.MAXBYTES,
'NO',
F.BYTES)) MAXBYTES
FROM DBA_DATA_FILES F
GROUP BY TABLESPACE_NAME) A,
(SELECT F.TABLESPACE_NAME, SUM(F.BYTES) BYTES_FREE
FROM DBA_FREE_SPACE F
GROUP BY TABLESPACE_NAME) B
WHERE A.TABLESPACE_NAME = B.TABLESPACE_NAME(+)
UNION ALL
SELECT H.TABLESPACE_NAME TABLESPACE_NAME,
ROUND(SUM(NVL(P.BYTES_USED, 0)) / POWER(2, 30), 2) USED_GB,
ROUND(SUM(DECODE(F.AUTOEXTENSIBLE,
'YES',
F.MAXBYTES,
'NO',
F.BYTES)) / POWER(2, 30),
2) MAX_GB
FROM V$TEMP_SPACE_HEADER H, V$TEMP_EXTENT_POOL P, DBA_TEMP_FILES F
WHERE P.FILE_ID(+) = H.FILE_ID
AND P.TABLESPACE_NAME(+) = H.TABLESPACE_NAME
AND F.FILE_ID = H.FILE_ID
AND F.TABLESPACE_NAME = H.TABLESPACE_NAME
GROUP BY H.TABLESPACE_NAME)
ORDER BY 4;
--带获取数据文件及路径
SELECT B.FILE_NAME 物理文件名,
B.TABLESPACE_NAME 表空间名称,
B.BYTES / 1024 / 1024 总大小M,
(B.BYTES - SUM(NVL(A.BYTES, 0))) / 1024 / 1024 已使用M,
SUBSTR((B.BYTES - SUM(NVL(A.BYTES, 0))) / (B.BYTES) * 100, 1, 5) 使用率
FROM DBA_FREE_SPACE A, DBA_DATA_FILES B
WHERE A.FILE_ID = B.FILE_ID
GROUP BY B.TABLESPACE_NAME, B.FILE_NAME, B.BYTES
ORDER BY B.TABLESPACE_NAME;
SELECT A.TABLESPACE_NAME TABLESPACE_NAME,
TOTAL / 1048576 TOTAL_M,
FREE / 1048576 FREE_M,
(TOTAL - FREE) / 1048576 USED_M,
ROUND((TOTAL - FREE) / TOTAL, 4) * 100 "USED%",
AUTOEXTENSIBLE AUTOEXTEM
FROM (SELECT TABLESPACE_NAME, SUM(BYTES) FREE
FROM DBA_FREE_SPACE
GROUP BY TABLESPACE_NAME) A,
(SELECT TABLESPACE_NAME,
SUM(BYTES) TOTAL,
MAX(AUTOEXTENSIBLE) AUTOEXTENSIBLE
FROM DBA_DATA_FILES
GROUP BY TABLESPACE_NAME) B
WHERE A.TABLESPACE_NAME = B.TABLESPACE_NAME
ORDER BY 6, 5 DESC;
--查看表空间的名字及文件所在位置
SELECT TABLESPACE_NAME,
FILE_ID,
FILE_NAME,
ROUND(BYTES / (1024 * 1024), 0) TOTAL_SPACE
FROM DBA_DATA_FILES
ORDER BY TABLESPACE_NAME;
--查询表空间使用情况
SELECT A.TABLESPACE_NAME AS "表空间名",
A.BYTES / 1024 / 1024 AS "表空间大小(M)",
(A.BYTES - B.BYTES) / 1024 / 1024 AS "已使用空间(M)",
B.BYTES / 1024 / 1024 "空闲空间(M)",
ROUND(((A.BYTES - B.BYTES) / A.BYTES) * 100, 2) "使用比"
FROM (SELECT TABLESPACE_NAME, SUM(BYTES) BYTES
FROM DBA_DATA_FILES
GROUP BY TABLESPACE_NAME) A,
(SELECT TABLESPACE_NAME, SUM(BYTES) BYTES, MAX(BYTES) LARGEST
FROM DBA_FREE_SPACE
GROUP BY TABLESPACE_NAME) B
WHERE A.TABLESPACE_NAME = B.TABLESPACE_NAME
ORDER BY ((A.BYTES - B.BYTES) / A.BYTES) DESC;
SELECT A.A1 表空间名称,
C.C2 类型,
C.C3 区管理,
B.B2 / 1024 / 1024 表空间大小M,
(B.B2 - A.A2) / 1024 / 1024 已使用M,
SUBSTR((B.B2 - A.A2) / B.B2 * 100, 1, 5) 利用率
FROM (SELECT TABLESPACE_NAME A1, SUM(NVL(BYTES, 0)) A2
FROM DBA_FREE_SPACE
GROUP BY TABLESPACE_NAME) A,
(SELECT TABLESPACE_NAME B1, SUM(BYTES) B2
FROM DBA_DATA_FILES
GROUP BY TABLESPACE_NAME) B,
(SELECT TABLESPACE_NAME C1, CONTENTS C2, EXTENT_MANAGEMENT C3
FROM DBA_TABLESPACES) C
WHERE A.A1 = B.B1
AND C.C1 = B.B1
ORDER BY 6 DESC;
---所有用户表使用大小的前三十名
SELECT *
FROM (SELECT SEGMENT_NAME, BYTES
FROM DBA_SEGMENTS
WHERE OWNER = USER
ORDER BY BYTES DESC)
WHERE ROWNUM <= 30;
--有两种含义的表大小。一种是分配给一个表的物理空间数量，而不管空间是否被使用。可以这样查询获得字节数：
SELECT SEGMENT_NAME, BYTES FROM USER_SEGMENTS WHERE SEGMENT_TYPE = 'TABLE';
--or
SELECT SEGMENT_NAME, SUM(BYTES) / 1024 / 1024
FROM USER_EXTENTS
GROUP BY SEGMENT_NAME;
--另一种表实际使用的空间
ANALYZE TABLE EMP COMPUTE STATISTICS;
SELECT NUM_ROWS * AVG_ROW_LEN
FROM USER_TABLES
WHERE TABLE_NAME = 'T_TEST';
SELECT NUM_ROWS * AVG_ROW_LEN, T.*
FROM DBA_TABLES T
WHERE TABLE_NAME = 'T_TEST';
来源：https://www.cnblogs.com/ritchy/p/10917393.html