可以使用 alter database datafile 'file path...' resize xM 的命令來(lái)縮小數(shù)據(jù)文件。

SELECT 'alter database datafile ''' || A.FILE_NAME || ''' resize ' ||

ROUND(A.FILESIZE - (A.FILESIZE - C.HWMSIZE - 100) * 0.8) || 'M;',

A.FILESIZE || 'M' AS "數(shù)據(jù)文件的總大小", C.HWMSIZE || 'M' AS "數(shù)據(jù)文件的實(shí)用大小"

FROM (SELECT FILE_ID, FILE_NAME, ROUND(BYTES / 1024 / 1024) AS FILESIZE

FROM DBA_DATA_FILES) A,

(SELECT FILE_ID, ROUND(MAX(BLOCK_ID) * 8 / 1024) AS HWMSIZE

FROM DBA_EXTENTS

GROUP BY FILE_ID) C

WHERE A.FILE_ID = C.FILE_ID AND

A.FILESIZE - C.HWMSIZE > 100;

or

SELECT 'alter database ' || A.NAME || ' datafile ''' || B.FILE_NAME || '''' ||

' resize ' ||

GREATEST(TRUNC(BYTES_FULL / .7), (BYTES_TOTAL - BYTES_FREE)) ||

CHR(10) || '--tablespace was ' ||

TRUNC(BYTES_FULL * 100 / BYTES_TOTAL) || '% full now ' ||

TRUNC(BYTES_FULL * 100 /

GREATEST(TRUNC(BYTES_FULL / .7), (BYTES_TOTAL - BYTES_FREE))) || '%'

FROM V$DATABASE A, DBA_DATA_FILES B,

(SELECT TABLESPACE_NAME, SUM(BYTES) BYTES_FULL

FROM DBA_EXTENTS

GROUP BY TABLESPACE_NAME) C,

(SELECT TABLESPACE_NAME, SUM(BYTES) BYTES_TOTAL

FROM DBA_DATA_FILES

GROUP BY TABLESPACE_NAME) D,

(SELECT A.TABLESPACE_NAME, A.FILE_ID, B.BYTES BYTES_FREE

FROM (SELECT TABLESPACE_NAME, FILE_ID,

MAX(BLOCK_ID) MAX_DATA_BLOCK_ID

FROM DBA_EXTENTS

GROUP BY TABLESPACE_NAME, FILE_ID) A, DBA_FREE_SPACE B

WHERE A.TABLESPACE_NAME = B.TABLESPACE_NAME AND

A.FILE_ID = B.FILE_ID AND

B.BLOCK_ID > A.MAX_DATA_BLOCK_ID) E

WHERE B.TABLESPACE_NAME = C.TABLESPACE_NAME AND

B.TABLESPACE_NAME = D.TABLESPACE_NAME AND

BYTES_FULL / BYTES_TOTAL < .7 AND

B.TABLESPACE_NAME = E.TABLESPACE_NAME AND

B.FILE_ID = E.FILE_ID;

alter tablespace TABLESPACENAME coalesce

此語(yǔ)句是整合表空間的碎片增加表空間的連續(xù)性，但是他不會(huì)收縮一個(gè)文件的大小的

選擇某個(gè)表空間中超過(guò)N個(gè)blocks的segments，通過(guò)此語(yǔ)句可以看出那個(gè)表占用的空間大

SELECT OWNER, SEGMENT_NAME, SEGMENT_TYPE, BLOCKS

FROM DBA_SEGMENTS

WHERE TABLESPACE_NAME = 'RISK' AND

BLOCKS > 1000

ORDER BY BLOCKS DESC;

分析表，得知表的一些信息

analyze table TABLENAME estimate statistics;

SELECT INITIAL_EXTENT, NEXT_EXTENT, MIN_EXTENTS, BLOCKS, EMPTY_BLOCKS

FROM DBA_TABLES

WHERE TABLE_NAME = 'xx' AND

OWNER = 'xx';

用alter table ... deallocate unused命令回收表的空間

alter table user.tablename deallocate unused keep 1k;

總結(jié)

以上是生活随笔為你收集整理的hujingwei oracle_Oracle收缩表空间的全部?jī)?nèi)容，希望文章能夠幫你解決所遇到的問(wèn)題。

如果覺(jué)得生活随笔網(wǎng)站內(nèi)容還不錯(cuò)，歡迎將生活随笔推薦給好友。