Oracle各种空间大小及占用大小

2018-02-06 09:43:35来源:oschina作者:kaixinguo314人点击

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1. 表占用空间大小计算方法


Select S.SEGMENT_NAME ,DECODE(SUM(BYTES), NULL, 0, SUM(BYTES) / 1024 / 1024) Mbytes
From DBA_SEGMENTS S
Where S.SEGMENT_NAME = 'MTL_MATERIAL_TRANSACTIONS' --表名
And S.SEGMENT_TYPE = 'TABLE'
Group By S.SEGMENT_NAME

2. 索引占用空间大小计算方法


Select S.SEGMENT_NAME ,DECODE(SUM(BYTES), NULL, 0, SUM(BYTES) / 1024 / 1024) Mbytes
From DBA_SEGMENTS S
Where S.SEGMENT_NAME = 'MTL_MATERIAL_TRANSACTIONS_N1' --索引
And S.SEGMENT_TYPE = 'INDEX'
Group By S.SEGMENT_NAME

3. 分区表占用空间大小计算方法


Select S.SEGMENT_NAME ,DECODE(SUM(BYTES), NULL, 0, SUM(BYTES) / 1024 / 1024) Mbytes
From DBA_SEGMENTS S
Where S.SEGMENT_TYPE = 'TABLE PARTITION'
Group By S.SEGMENT_NAME

4. 表空间使用情况


SELECT A.TABLESPACE_NAME 表空间名称,
Round(A.BYTES, 2) "总空间(G)",
Round(B.BYTES, 2) "未用空间(G)",
ROUND(((A.BYTES - B.BYTES) / A.BYTES) * 100, 2) "使用率%"
FROM (SELECT TABLESPACE_NAME, SUM(BYTES) / (1024 * 1024 * 1024) BYTES
FROM DBA_DATA_FILES
GROUP BY TABLESPACE_NAME) A,
(SELECT TABLESPACE_NAME, SUM(BYTES) / (1024 * 1024 * 1024) BYTES
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;

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