查看Oracle数据库中表空间信息的命令方法

时间：2021-07-11 03:27:53

查看所有表空间使用情况
select 
b.file_id 文件ID号, 
b.tablespace_name 表空间名, 
b.bytes/1024/1024||'M'字节数, 
(b.bytes-sum(nvl(a.bytes,0)))/1024/1024||'M' 已使用, 
sum(nvl(a.bytes,0))/1024/1024||'M' 剩余空间, 
100 - sum(nvl(a.bytes,0))/(b.bytes)*100 占用百分比 
from dba_free_space a,dba_data_files b 
where a.file_id=b.file_id 
group by b.tablespace_name,b.file_id,b.bytes 
order by b.file_id;

1.未使用的表空间大小 
select tablespace_name,sum(bytes)/1024/1024 from dba_free_space group by tablespace_name;

2.查看所有表空间大小select tablespace_name,sum(bytes)/1024/1024 from dba_data_files group by tablespace_name;
3.查询所有的表空间select tablespace_name from dba_tablespaces;
4.在oracle数据库中，临时表空间主要用于用户在使用order by 、group by语句进行排序和汇总时所需的临时工作空间。要查询数据库中临时表空间的名称，大小及数据文件，可以查询数据字典dba_tablespaces及dba_data_files。命令如下：select a.tablespace_name space_name, b.bytes bytes, b.file_name filename from dba_tablespaces a, dba_data_files b where a.tablespace_name=b.tablespace_name and a.contents='TEMPORARY';
5.查看Oracle数据库中表空间信息的命令方法：select a.a1 space_name, c.c2 type, c.c3 quM, b.b2/1024/1024 space_size,
(b.b2-a.a2)/1024/1024 used, substr((b.b2-a.a2)/b.b2*100,1,5) rating
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;
6.查看Oracle数据库中表空间使用情况的命令方法：

SELECT upper(f.tablespace_name) "Tablespacename",
d.Tot_grootte_Mb "TablespaceSize",
d.Tot_grootte_Mb - f.total_bytes "Used",
to_char(round((d.Tot_grootte_Mb - f.total_bytes) / d.Tot_grootte_Mb * 100,2),'990.99') "Rate",
f.total_bytes "Avail",
f.max_bytes "MaxBlock"
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;

 

--------------------------------
1.查看临时表空间使用情况：SELECT d.status "Status", d.tablespace_name "Name", d.contents "Type",              d.extent_management "Extent Management", 
              TO_CHAR(NVL(a.bytes / 1024 / 1024, 0),'99,999,990.900') "Size (M)", 
              NVL(t.bytes, 0)/1024/1024 ||'/'||NVL(a.bytes/1024/1024, 0) "Used (M)", 
              TO_CHAR(NVL(t.bytes / a.bytes * 100, 0), '990.00') "Used %" 
FROM sys.dba_tablespaces d, 
          (select tablespace_name, sum(bytes) bytes from dba_temp_files group by tablespace_name) a, 
          (select tablespace_name, sum(bytes_cached) bytes from v$temp_extent_pool group by tablespace_name) t 
WHERE d.tablespace_name = a.tablespace_name(+) 
           AND d.tablespace_name = t.tablespace_name(+) 
           AND d.extent_management like 'LOCAL' 
           AND d.contents like 'TEMPORARY';
从oracle 9i开始，可以创建Temporary tablespace类表空间，即“临时“表空间，这类表空间使用临时文件。临时文件的信息被存储在数据字典V$tempfile中。命令如下：select file#, status, name from v$tempfile;
2.查询oracle系统用户的默认表空间和临时表空间select default_tablespace,temporary_tablespace from dba_users;---------------------------------------------------
3.分享: 如何查找正在使用临时表空间的session/sqltext
---------------------------------------------------select
   a.username, a.sid, a.serial#, a.process,
   b.tablespace, b.segtype, b.userblocks,
   d.current_users, d.total_blocks, d.used_blocks, d.free_blocks,
   d.max_used_blocks, d.max_sort_blocks,
   e.physizemb, e.phyblocks, round(d.max_used_blocks/e.phyblocks*100,2) max_used_ratio, 
   round(d.used_blocks/e.phyblocks*100,2) current_used_ratio,
   round(b.userblocks/e.phyblocks*100,2) user_ratio,
   c.sql_text
from
   v$session a,
   (select session_addr, tablespace,segtype, sum(blocks) userblocks from v$tempseg_usage group by session_addr, tablespace,segtype) b,
   v$sqltext c,
   v$sort_segment d,
   (select tablespace_name, round(sum(bytes)/1024/1024,2) physizemb, sum(blocks) phyblocks
    from dba_temp_files group by tablespace_name) e
where
   a.saddr = b.session_addr 
   and a.sql_address = c.address
   and a.sql_hash_value = c.hash_value
   and c.piece = 0 
   and b.tablespace = d.tablespace_name
   and b.tablespace = e.tablespace_name;    
4.查询用户表空间的表select   * from user_tables;

获取创建表空间的语句：
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
alter   tablespace   MLOG_NORM_SPACE
add   datafile   '/Oracle/oms/oradata/mlog/Mlog_Norm_data001.dbf'
size   10M   autoextend   on   maxsize   20G


--5验证已经增加的数据文件
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：
alter   tablespace   MLOG_NORM_SPACE
drop    datafile '/oracle/oms/oradata/mlog/Mlog_Norm_data001.dbf'

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