oracle数据库表空间

1.查看表空间自动增长情况：
SELECT T.TABLESPACE_NAME,D.FILE_NAME,
D.AUTOEXTENSIBLE,D.BYTES,D.MAXBYTES,D.STATUS
FROM DBA_TABLESPACES T,DBA_DATA_FILES D
WHERE T.TABLESPACE_NAME =D.TABLESPACE_NAME
ORDER BY TABLESPACE_NAME,FILE_NAME;

2.查看各表空间分配情况。

select tablespace_name, sum(bytes) / 1024 / 1024 from dba_data_files
group by tablespace_name;
3.查看各表空间空闲情况。
select tablespace_name, sum(bytes) / 1024 / 1024 from dba_free_space group by tablespace_name;
4.更改数据表大小(10G)
alter database datafile '/ora/oradata/radius/undo.dbf' resize 10240m；
5.设置表空间不足时自动增长

5.1查看表空间是否自动增长

SELECT FILE_NAME,TABLESPACE_NAME,AUTOEXTENSIBLE FROM dba_data_files;

5.2 设置表空间自动增长

ALTER DATABASE DATAFILE 'c:\SmartDB01.ora' AUTOEXTEND ON;//打开自动增长
ALTER DATABASE DATAFILE 'c:\SmartDB01.ora' AUTOEXTEND ON NEXT 200M ;//每次自动增长200m
ALTER DATABASE DATAFILE 'c:\SmartDB01.ora' AUTOEXTEND ON NEXT 200M MAXSIZE 1024M;//每次自动增长200m，数据表最大不超过1G

===============================--1查看表空间已经使用的百分比

select a.tablespace_name,a.bytes/1024/1024 "Sum MB",(a.bytes-b.bytes)/1024/1024 "used MB",b.bytes/1024/1024 "free MB",round(((a.bytes-b.bytes)/a.bytes)*100,2) "percent_used"

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

“Sum MB”表示表空间所有的数据文件总共在操作系统占用磁盘空间的大小

比如：test表空间有2个数据文件，datafile1为300MB，datafile2为400MB，那么test表空间的“Sum MB”就是700MB

“userd MB”表示表空间已经使用了多少

“free MB”表示表空间剩余多少

“percent_user”表示已经使用的百分比

--2比如从1中查看到MLOG_NORM_SPACE表空间已使用百分比达到90%以上，可以查看该表空间总共有几个数据文件，每个数据文件是否自动扩展，可以自动扩展的最大值。

[html]
view plaincopyprint?

select file_name,tablespace_name,bytes/1024/1024 "bytes MB",maxbytes/1024/1024 "maxbytes MB" from dba_data_files

where tablespace_name='MLOG_NORM_SPACE';

[html]
view plaincopyprint?

select   dbms_metadata.get_ddl('TABLESPACE','MLOG_NORM_SPACE')   from   dual;

select   dbms_metadata.get_ddl('TABLESPACE','MLOG_NORM_SPACE')   from   dual;

--4确认磁盘空间足够，增加一个数据文件



[html]
view plaincopyprint?

alter tablespace MLOG_NORM_SPACE
add datafile '/oracle/oms/oradata/mlog/Mlog_Norm_data001.dbf'

size 10M autoextend on maxsize 20G

[html]
view plaincopyprint?

select   file_name,file_id,tablespace_name   from   dba_data_files

where   tablespace_name='MLOG_NORM_SPACE'

select   file_name,file_id,tablespace_name   from   dba_data_files
where   tablespace_name='MLOG_NORM_SPACE'

--6如果删除表空间数据文件，如下：

[html]
view plaincopyprint?

alter tablespace MLOG_NORM_SPACE
drop datafile '/oracle/oms/oradata/mlog/Mlog_Norm_data001.dbf'

alter tablespace MLOG_NORM_SPACE
drop datafile '/oracle/oms/oradata/mlog/Mlog_Norm_data001.dbf'

备注： linux下查看磁盘剩余空间和文件夹大小

df -hl 查看磁盘剩余空间

du -sm 文件夹

返回该文件夹总M数

更多功能查看：

df --help

du --help

du --help

用法：du [选项]... [文件]...

总结每个<文件>的磁盘用量，目录则取总用量。
长选项必须用的参数在使用短选项时也是必须的。

-a, --all write counts for all files, not just directories

--apparent-size print apparent sizes, rather than disk usage; although

the apparent size is usually smaller, it may be

larger due to holes in (`sparse') files, internal

fragmentation, indirect blocks, and the like

-B, --block-size=SIZE use SIZE-byte blocks

-b, --bytes equivalent to `--apparent-size --block-size=1'

-c, --total produce a grand total

-D, --dereference-args dereference FILEs that are symbolic links

-H like --si, but also evokes a warning; will soon

change to be equivalent to --dereference-args (-D)

-h, --human-readable print sizes in human readable format (e.g., 1K 234M 2G)

--si like -h, but use powers of 1000 not 1024

-k like --block-size=1K

-l, --count-links count sizes many times if hard linked

-L, --dereference dereference all symbolic links

-P, --no-dereference don't follow any symbolic links (this is the default)

-0, --null end each output line with 0 byte rather than newline

-S, --separate-dirs do not include size of subdirectories

-s, --summarize display only a total for each argument

-x, --one-file-system skip directories on different filesystems

-X FILE, --exclude-from=FILE Exclude files that match any pattern in FILE.

--exclude=PATTERN Exclude files that match PATTERN.

--max-depth=N print the total for a directory (or file, with --all)

only if it is N or fewer levels below the command

line argument; --max-depth=0 is the same as

--summarize

--help 显示此帮助信息并离开

--version 显示版本信息并离开

du -smh oracle 查看文件夹的大小（oracle 文件夹名）
54G //显示oracle文件夹的大小为54G