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oracle 表空间操作

时间:2015-07-24 12:17:51      阅读:150      评论:0      收藏:0      [点我收藏+]

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1.oracle 查看表空间使用情况

1)使用sysdba进入sqlplus 
--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 1;
--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;
--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;

--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;

2.oracle 扩展表空间

1 第一步: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

2 第二步:增大所需表空间大小:
alter database datafile ‘表空间位置‘resize 新的尺寸
例如:
alter database datafile ‘\oracle\oradata\anita_2008.dbf‘ resize 4000m

3 第三步:设置表空间自动扩展
alter database datafile ‘\oracle\oradata\anita_2008.dbf‘ autoextend on next 100m maxsize 10000m

4 查表空间下有哪些表
select TABLE_NAME,TABLESPACE_NAME from  dba_tables where TABLESPACE_NAME like ‘%TBS_PORTAL%‘;

//以具体用户进入数据库
5. select segment_name from user_segmant where segmant_type=‘TBS_PORTAL‘;
desc dba_segmant;
--查看当前用户每个表占用空间的大小:
Select Segment_Name,Sum(bytes)/1024/1024 From User_Extents Group By Segment_Name;
--查看每个表空间占用空间的大小:
Select Tablespace_Name,Sum(bytes)/1024/1024 From Dba_Segments Group By Tablespace_Name
--查看表占用的容量	
select a.segment_name,a.BYTES /1024 /1024 as M from user_segments a where a.segment_type=‘TABLE‘ and a.TABLESPACE_NAME=‘TBS_PORTAL‘
order by M desc ;	

select a.segment_name,a.BYTES /1024 /1024 as M 
from user_segments a where a.segment_type=‘TABLE‘
order by M desc ;

Select Segment_Name,Sum(bytes)/1024/1024 From User_Extents Group By Segment_Name;

3.oracle 删除表空间释放空间

SQL> alter table tb_im_req_msg enable row movement;
Table altered.
SQL> alter table tb_im_req_msg shrink space;
Table altered.

4.oracle UNDO表空间

1)查看当前的undo表空间
Show parameter undo
Show parameter undo_tablespace

2)显示数据库的所有UNDO表空间.
SELECT tablespace_name FROM dba_tablespaces WHERE contents=‘UNDO‘;

3)切换UNDO表空间.
alter system set undo_tablespace=undotbs02 scope=both;

oracle 表空间操作

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原文地址:http://www.cnblogs.com/songjinduo/p/4672952.html

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